diff --git a/ROADMAP.md b/ROADMAP.md
index f3e6750ed..740ec6010 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~30 points of "ready for real work" and ~350–620 h away
 
-> **Last reviewed:** 2026-10-22 · **Last updated:** 2026-10-30 · **Change:** minor (localization: 303 more panel/dialog rows in Japanese and the Chinese catalogs; recounted after #1774: Japanese 27% → 46%, Simplified Chinese 29% → 46%, Traditional Chinese 29% → 38%, overall 18% → 24%) · **Target:** Adobe After Effects 2026 (26.5.0.89)
+> **Last reviewed:** 2026-10-22 · **Last updated:** 2026-10-30 · **Change:** minor (features of 30 October in the progress log: text Line Join, Timeline drag-reorder and multi-select of effects, viewer edge pan, ScriptUI drag capture and dock size; previously: localization recount after #1774) · **Target:** Adobe After Effects 2026 (26.5.0.89)
 
 EffectCraft aims to do what After Effects does, with the same panels, menus and behaviour, written
 from scratch in Rust. This page is the one-page summary; the evidence is in
@@ -117,6 +117,14 @@ Come tell us what matters most to you on [Discord](https://discord.gg/artcraft).
 
 ## Progress log
 
+- 2026-10-30: Text strokes take a Line Join (Miter, Round or Bevel) in the Character panel,
+  Miter for new text as in After Effects (#2077). In the Timeline, effects, masks and shape items
+  drag to a new place in their stack (#2210) and Shift-click adds them to the selection, so one
+  animation preset can hold several (#2552). The Composition panel pans while a mask vertex is
+  held at its edge (#999). Effect buffers that pad a small layer stay within a memory budget
+  (#2261); an MP4 lasts as long as its edit list shows (#2592); the Render Queue's times tick
+  between frames (#2593). ScriptUI drags keep their control past the window edge with
+  `MouseEvent.buttons` (#2584), and docked panels get their dock's size and `onResize` (#2585).
 - 2026-10-28: A shape layer's Rectangle and Ellipse Size get the Constrain Proportions chain
   that Scale has, so a circle stays a circle while its size is typed, scrubbed or keyed; it
   starts off, so existing shapes behave as before (#2489).
@@ -169,6 +177,7 @@ Come tell us what matters most to you on [Discord](https://discord.gg/artcraft).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-30 | minor | Progress log: text Line Join, Timeline drag-reorder and Shift multi-select of effects, viewer edge pan, effect padding budget, MP4 edit-list duration, Render Queue clock, ScriptUI drag capture and docked-panel size |
 | 2026-10-22 | minor | Localization: 300 more panel/dialog rows in Japanese and the Chinese catalogs, plus the review's three missing rows (Basic, Advanced, Play/Stop) — panel tabs, form and dialog labels, context menus, tracker/graph/text-panel controls, File-panel footers, credits; language shares recounted after #1774 (Japanese 27% → 46% with 297 effect names, Simplified Chinese 29% → 46% with 307 effect names, Traditional Chinese 29% → 38%, overall 18% → 24%) |
 | 2026-10-12 | minor | Open-issue count (134 to 216), crash list and localization share (12% to 18%) updated to match docs/gaps.md |
 | 2026-10-12 | patch | Roto Brush span validation after trimming; command regressions for both layer edges |
diff --git a/contributors/people.toml b/contributors/people.toml
index c985dbc2e..59365207a 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -17,6 +17,9 @@
 # To remove your names, delete your entry (or set fields empty) in a PR. The next
 # contributors.py run, and the next build, drop them.
 
+[people.Krueels]
+sync_github_name = true
+
 [people.echelon]
 real_name = "Brandon Thomas"
 display_name = "Brandon Thomas"
diff --git a/crates/automation/src/confine.rs b/crates/automation/src/confine.rs
index 2b0795c93..06b83a880 100644
--- a/crates/automation/src/confine.rs
+++ b/crates/automation/src/confine.rs
@@ -96,6 +96,7 @@ const MIXED_WRITES: &[(&str, &[&str])] = &[("templates.create", &["projectPath",
 
 /// Commands that write files named by these parameters.
 const WRITES: &[(&str, &[&str])] = &[
+    ("camera.exportBlender", &["path"]),
     ("file.save", &["path"]),
     ("file.saveAs", &["path"]),
     ("file.saveCopy", &["path"]),
diff --git a/crates/automation/src/tests.rs b/crates/automation/src/tests.rs
index 519c7c433..1121c5d91 100644
--- a/crates/automation/src/tests.rs
+++ b/crates/automation/src/tests.rs
@@ -1485,3 +1485,30 @@ fn automation_roots_refuse_running_script_code() {
     call_json(&mut s, "execute_command", json!({"command": "scriptui.list"}));
     let _ = std::fs::remove_dir_all(&base);
 }
+
+#[test]
+fn blender_export_requires_an_absolute_path_in_a_write_root() {
+    use crate::confine::Confinement;
+    let base = std::env::temp_dir().join(format!("ec-blender-confine-{}", std::process::id()));
+    let (read, write) = (base.join("read"), base.join("write"));
+    for dir in [&read, &write] {
+        std::fs::create_dir_all(dir).unwrap();
+    }
+    let confinement = Confinement::new(std::slice::from_ref(&read), std::slice::from_ref(&write)).unwrap();
+    let check = |path: &std::path::Path| confinement.check_command("camera.exportBlender", &json!({"path": path}));
+    assert_eq!(check(&write.join("scene.py")).unwrap(), None);
+    for path in [read.join("scene.py"), base.join("outside.py"), write.join("../read/scene.py")] {
+        assert!(check(&path).is_err(), "must deny {}", path.display());
+    }
+    for path in ["scene.py", "./scene.py", "write/scene.py", "../scene.py"] {
+        let error = check(std::path::Path::new(path)).unwrap_err().to_string();
+        assert!(error.contains("give an absolute path"), "{path}: {error}");
+    }
+    let read_only = Confinement::new(std::slice::from_ref(&write), &[]).unwrap();
+    assert!(read_only.check_command("camera.exportBlender", &json!({"path": write.join("scene.py")})).is_err());
+    for path in [json!(read.join("scene.py")), json!("scene.py"), json!("$1.path")] {
+        let batch = json!({"steps": [{"command": "camera.exportBlender", "params": {"path": path}}]});
+        assert!(confinement.check_command("engine.batch", &batch).is_err());
+    }
+    std::fs::remove_dir_all(&base).unwrap();
+}
diff --git a/crates/effects/src/lib.rs b/crates/effects/src/lib.rs
index 44c8a987b..c865d4f96 100644
--- a/crates/effects/src/lib.rs
+++ b/crates/effects/src/lib.rs
@@ -117,7 +117,7 @@ pub use ocio::color_stabilizer_maps;
 // GPU effects, part B (3D Channel, Immersive Video, colour management, simulation render passes).
 pub use channel3d::{CRYPTO_LAYERS, CryptoAux, aux_point, crypto_aux_image, crypto_aux_image_with, id_color, selection_hashes};
 pub use ocio::{ColorOp, Straight, Tf, color_program};
-pub use sim::{Acc, Blob, Bubble, Post, Shape, Sprite, SpritePlan, Tint, bubble_list, drizzle_drops, mercury_blobs, sprite_plan};
+pub use sim::{Acc, Blob, Bubble, Post, Shape, Sprite, SpritePlan, Tint, bubble_list, bubble_sample_bounds, drizzle_drops, mercury_blobs, sprite_plan};
 pub use sim2::{
     CausticsSetup, FoamDisc, FoamEnv, FoamPlan, Piece, PiecePlan, PieceTex, PixelPlan, WavePlan, Waves, caustics_setup, foam_full_plan, piece_plan, pixel_plan,
     wave_world_plan,
diff --git a/crates/effects/src/sim.rs b/crates/effects/src/sim.rs
index 79a225f75..333549e7d 100644
--- a/crates/effects/src/sim.rs
+++ b/crates/effects/src/sim.rs
@@ -38,7 +38,7 @@ use particle_fx::{PW_RATE, mercury_phys, ps2_phys, pw_phys};
 pub use registry::{specs, sprite_plan};
 pub use sprites::{Acc, Post, Shape, Sprite, SpritePlan, Tint};
 pub(crate) use sprites::{combine, raster, splat};
-pub use weather::{Bubble, bubble_list, drizzle_drops};
+pub use weather::{Bubble, bubble_list, bubble_sample_bounds, drizzle_drops};
 
 #[cfg(test)]
 mod tests;
diff --git a/crates/effects/src/sim/tests.rs b/crates/effects/src/sim/tests.rs
index d5de4cb74..06ce973b2 100644
--- a/crates/effects/src/sim/tests.rs
+++ b/crates/effects/src/sim/tests.rs
@@ -112,6 +112,45 @@ fn bubbles_near_edges_show_the_layer() {
     assert_eq!(pale, [0, 0], "pale bubble pixels (liquid, metal)");
 }
 
+/// CC Bubbles on a 40 × 40 layer `img` at `scale`, in a buffer padded by 6 transparent pixels
+/// (a half-resolution preview's layout).
+fn padded_bubbles(img: Image, scale: f64, reflection: u32) -> Image {
+    let size = 40.0;
+    let s = crate::find("ec.sim.ccbubbles").unwrap();
+    let mut params = crate::Params { values: s.params.iter().map(|p| (p.id.to_string(), crate::default_value(p, [size; 2]))).collect() };
+    for (k, v) in [("bubbleAmount", num(200.0)), ("bubbleSize", num(3.0)), ("reflectionType", Value::Enum(reflection))] {
+        params.values.insert(k.into(), v);
+    }
+    let ctx = EffectCtx { params: &params, time: 0.3, layer_size: [size; 2], seed: 1, adjustment: false, env: EffectEnv::default() };
+    let mut b = Buf { img, offset: [0.0; 2], scale };
+    b.pad(6);
+    crate::apply(s, &ctx, b).img
+}
+
+/// #2024: the same when the buffer has transparent padding around the layer: samples past the
+/// layer's edges repeat its edge pixels, not the padding, and a clear hole inside the layer is
+/// still refracted as the pale colour.
+#[test]
+fn bubbles_near_padded_edges_show_the_layer() {
+    let blue = |side| Image::filled(side, side, [0.0, 0.0, 1.0, 1.0]);
+    let pale = |img: &Image| img.data.iter().filter(|p| (p[2] - p[0] - p[3]).abs() > 1e-4).count();
+    for (scale, side) in [(1.0, 40), (0.5, 20)] {
+        let counts = [0, 1].map(|reflection| {
+            let a = padded_bubbles(blue(side), scale, reflection);
+            assert!(a.data.iter().any(|p| p[3] > 0.5), "bubbles drawn");
+            pale(&a)
+        });
+        assert_eq!(counts, [0, 0], "pale bubble pixels at scale {scale} (liquid, metal)");
+    }
+    let mut holed = blue(40);
+    for y in 12..28 {
+        for x in 12..28 {
+            holed.set(x, y, [0.0; 4]);
+        }
+    }
+    assert!(pale(&padded_bubbles(holed, 1.0, 0)) > 0, "the hole refracts as the pale colour");
+}
+
 #[test]
 fn drizzle_ripples() {
     let a = run("ec.sim.ccdrizzle", &[], ramp(48, 48), 0.6);
diff --git a/crates/effects/src/sim/weather.rs b/crates/effects/src/sim/weather.rs
index b58b39b5e..347ab4939 100644
--- a/crates/effects/src/sim/weather.rs
+++ b/crates/effects/src/sim/weather.rs
@@ -1,6 +1,7 @@
 use super::common::{h, hs};
 use super::sprites::{Acc, Post, Shape, Sprite, SpritePlan, Tint, aa, raster};
 use super::{Buf, EffectCtx, Image, IntoParallelIterator, ParallelIterator, unpremul};
+use crate::util::layer_rect_at;
 
 // ------------------------------------------------------------------ CC Rainfall / CC Snowfall
 
@@ -160,11 +161,21 @@ pub fn bubble_list(ctx: &EffectCtx, b: &Buf) -> Vec<Bubble> {
         .collect()
 }
 
+/// CC Bubbles' refraction sample bounds in the pixels of a buffer with `offset` and `scale`: the
+/// layer rectangle's first and last pixel centres (x0, y0, x1, y1). Samples clamped to them repeat
+/// the layer's edge pixels instead of reaching transparent padding around it (#2024).
+pub fn bubble_sample_bounds(ctx: &EffectCtx, offset: [f64; 2], scale: f64) -> [f32; 4] {
+    let (lx, ly, lw, lh) = layer_rect_at(ctx, offset, scale);
+    let (x0, y0) = (lx + 0.5, ly + 0.5);
+    [x0 as f32, y0 as f32, (lx + lw - 0.5).max(x0) as f32, (ly + lh - 0.5).max(y0) as f32]
+}
+
 pub(super) fn bubbles(ctx: &EffectCtx, mut b: Buf) -> Buf {
     let pr = ctx.params;
     let metal = pr.e("reflectionType") == 1;
     let shading = pr.e("shadingType");
     let list = bubble_list(ctx, &b);
+    let [x0, y0, x1, y1] = bubble_sample_bounds(ctx, b.offset, b.scale);
     let src = b.img.clone();
     let mut out = Image::new(src.width, src.height);
     raster(
@@ -182,7 +193,8 @@ pub(super) fn bubbles(ctx: &EffectCtx, mut b: Buf) -> Buf {
             // Liquid refracts (inverted, magnified), metal reflects (wide-angle mirror).
             let k = if metal { 1.6 } else { -0.7 };
             let nz = (1.0 - d2).max(0.0).sqrt();
-            let p = src.sample_bilinear_clamped((q.sx + dx * q.r * k) as f64, (q.sy + dy * q.r * k) as f64);
+            let (sx, sy) = ((q.sx + dx * q.r * k).max(x0).min(x1), (q.sy + dy * q.r * k).max(y0).min(y1));
+            let p = src.sample_bilinear_clamped(sx as f64, sy as f64);
             let (c, sa) = unpremul(p);
             let mut c = if sa <= 0.0 { [0.6, 0.7, 0.8] } else { c };
             let mut a = cov;
diff --git a/crates/effects/tests/it/sim_golden.rs b/crates/effects/tests/it/sim_golden.rs
index 3932418ad..388790901 100644
--- a/crates/effects/tests/it/sim_golden.rs
+++ b/crates/effects/tests/it/sim_golden.rs
@@ -441,10 +441,10 @@ const GOLDEN: &[(&str, u64)] = &[
     ("ec.sim.ccbubbles/0/32bpc/t1.5", 0xd09565e124d8f5db),
     ("ec.sim.ccbubbles/0/32bpc/t0.8", 0x91242f8e1fd0ad84),
     ("ec.sim.ccbubbles/0/32bpc/t2.2", 0x1f9782131e62149d),
-    ("ec.sim.ccbubbles/0/8bpc/half/t0.5", 0x931b4ca707604220),
-    ("ec.sim.ccbubbles/0/8bpc/half/t1.5", 0x21c25d4555abebe9),
-    ("ec.sim.ccbubbles/0/8bpc/half/t0.8", 0x7e05972683359632),
-    ("ec.sim.ccbubbles/0/8bpc/half/t2.2", 0xadc4f7219dab4921),
+    ("ec.sim.ccbubbles/0/8bpc/half/t0.5", 0x020755e48bdf8f43),
+    ("ec.sim.ccbubbles/0/8bpc/half/t1.5", 0x4aac0f1332e6001e),
+    ("ec.sim.ccbubbles/0/8bpc/half/t0.8", 0xdc2ab5e04c4a95a2),
+    ("ec.sim.ccbubbles/0/8bpc/half/t2.2", 0x30f78adc5d1dd715),
     ("ec.sim.ccbubbles/1/8bpc/t0.5", 0x2f5415c679ff0980),
     ("ec.sim.ccbubbles/1/8bpc/t1.5", 0xfcfc354dcd22e6d0),
     ("ec.sim.ccbubbles/1/8bpc/t0.8", 0xdf90fd57c217019c),
diff --git a/crates/engine/src/cmd.rs b/crates/engine/src/cmd.rs
index cba6df6ef..bd089b52b 100644
--- a/crates/engine/src/cmd.rs
+++ b/crates/engine/src/cmd.rs
@@ -10,6 +10,7 @@ mod animation;
 pub(crate) mod app_more;
 mod autotrace;
 mod batch;
+mod blender;
 mod camera_cmds;
 mod comp;
 pub(crate) mod comp_more;
diff --git a/crates/engine/src/cmd/blender.rs b/crates/engine/src/cmd/blender.rs
new file mode 100644
index 000000000..e6c678101
--- /dev/null
+++ b/crates/engine/src/cmd/blender.rs
@@ -0,0 +1,295 @@
+//! Camera-solve interchange through Blender's public Python API. The generated script is
+//! original MIT OR Apache-2.0 code; no Blender implementation is read or embedded.
+
+use std::path::Path;
+
+use effectcraft_effects::camera_tracker as ct;
+use effectcraft_project::{Footage, FootageKind, ItemId, ItemKind, Layer, LayerId, LayerSource, Uid};
+use effectcraft_render::EvalCtx;
+use effectcraft_time::Tick;
+use effectcraft_track::camtrack::{CameraSolve, linalg};
+use serde_json::{Value, json};
+
+mod validate;
+
+use super::{b_p, bad, f_p, str_p};
+use crate::{EngineError, Result, Session};
+
+const CMD: &str = "camera.exportBlender";
+const MAX_FRAMES: usize = 100_000;
+const MAX_POINTS: usize = 100_000;
+const MAX_JSON: usize = 64 * 1024 * 1024;
+const MAX_FRAME: i64 = 1_048_574;
+
+fn number(p: &Value, key: &str, default: f64, min: f64, max: f64) -> Result<f64> {
+    let v = match p.get(key) {
+        None => default,
+        Some(_) => f_p(p, key).ok_or_else(|| bad(CMD, format!("{key}: expected a number")))?,
+    };
+    if !v.is_finite() || !(min..=max).contains(&v) {
+        return Err(bad(CMD, format!("{key}: expected {min}..{max}")));
+    }
+    Ok(v)
+}
+
+fn finite(values: impl IntoIterator<Item = f64>) -> Result<()> {
+    if values.into_iter().any(|v| !v.is_finite() || v.abs() > 1e12) {
+        return Err(bad(CMD, "invalid or excessive numeric camera/scene data; re-analyze the tracker"));
+    }
+    Ok(())
+}
+
+/// Right-handed EffectCraft world (right, down, forward) → Blender (right, forward, up).
+fn position(p: [f64; 3], scale: f64) -> [f64; 3] {
+    [p[0] * scale, p[2] * scale, -p[1] * scale]
+}
+
+fn media_path(s: &Session, path: &str) -> Result<String> {
+    if path.is_empty() || path.contains('\0') {
+        return Err(bad(CMD, "the source footage has no valid file path; relink it before exporting"));
+    }
+    let path = Path::new(path);
+    if path.is_absolute() || cfg!(target_arch = "wasm32") {
+        return Ok(path.to_string_lossy().into_owned());
+    }
+    let cwd = std::env::current_dir().map_err(|e| bad(CMD, format!("cannot resolve footage path: {e}")))?;
+    let base = s.path.as_deref().and_then(|p| Path::new(p).parent()).map(|p| cwd.join(p)).unwrap_or(cwd);
+    Ok(base.join(path).to_string_lossy().into_owned())
+}
+
+pub(super) fn export(s: &mut Session, p: &Value, cid: ItemId, lid: LayerId, uid: Uid) -> Result<Value> {
+    if s.running_for_script() && !s.prefs.scripting.allow_scripts_write_files {
+        return Err(bad(CMD, "scripts can't export files unless Settings ▸ Scripting & Expressions ▸ Allow Scripts to Write Files and Access Network is on"));
+    }
+    let options = Options::parse(p)?;
+    let Options { path, sensor, units, start, include_points } = options;
+    if s.camera_target().is_some_and(|(c, l, u)| (c, l, u) == (cid, lid, uid)) && s.is_camera_analyzing() || s.camera_pending.contains(&(cid, lid, uid)) {
+        return Err(bad(CMD, "wait for this tracker's analysis to finish before exporting"));
+    }
+    let comp = s.project.comp(cid).ok_or(EngineError::NoComp)?;
+    let layer = comp.layer(lid).ok_or_else(|| bad(CMD, "tracked layer missing"))?;
+    let g = layer.props.find_group(uid).ok_or_else(|| bad(CMD, "tracker missing"))?;
+    for name in [ct::SOLVE, ct::TRACKS] {
+        if g.prop(name).is_some_and(|p| matches!(&p.value, effectcraft_keyframe::Value::Str(v) if v.len() > MAX_JSON)) {
+            return Err(bad(CMD, "tracking data exceeds the 64 MiB export limit"));
+        }
+    }
+    let params = crate::camera_track::static_params(g);
+    let solve = ct::solve(&params).ok_or_else(|| bad(CMD, "the camera is not solved yet; analyze the tracker first"))?;
+    let (lo, end) = validate::timing(comp, layer, &solve, start)?;
+    let Source { footage, path: source_path, fps: source_fps, count: source_count } = source(s, layer, &solve, path)?;
+    validate::geometry(&solve, sensor)?;
+    let camera = params
+        .get(ct::CAMERA)
+        .map(|v| v.as_f64())
+        .filter(|v| v.is_finite() && *v > 0.0 && *v <= u64::MAX as f64)
+        .and_then(|id| comp.layer(LayerId(id as u64)))
+        .filter(|l| l.is_camera());
+    let warnings = scene_warnings(camera, &solve, footage);
+    let ctx = EvalCtx { expr: s.expr.as_deref(), ..EvalCtx::new(&s.project, cid, comp, lo) };
+    let (frames, world) = bake_frames(&ctx, layer, &solve, camera, &options, footage, source_count)?;
+    let mut points = Vec::new();
+    for point in &solve.points {
+        finite(point.pos.into_iter().chain([point.error as f64]))?;
+        if point.first > point.last || point.last as usize >= solve.frames.len() {
+            return Err(bad(CMD, "invalid solved point frame range; re-analyze the tracker"));
+        }
+        let location = position(world.apply(point.pos), units);
+        finite(location)?;
+        if include_points {
+            points.push(json!({"id": point.id, "location": location, "error": point.error,
+                "first": start.saturating_add(point.first as i64), "last": start.saturating_add(point.last as i64)}));
+        }
+    }
+    let tracks = ct::tracks(&params);
+    if tracks.as_ref().is_some_and(|t| t.tracks.len() > MAX_POINTS || t.tracks.iter().any(|t| t.pts.len() > MAX_FRAMES)) {
+        return Err(bad(CMD, "2D tracks exceed export limits"));
+    }
+    let markers: Vec<Value> = comp
+        .markers
+        .iter()
+        .filter_map(|m| {
+            let frame = start.saturating_add(comp.frame_rate.frame_at(m.time).saturating_sub(comp.frame_rate.frame_at(lo)));
+            if (start..=end).contains(&frame) { Some(json!({"name": m.comment, "frame": frame})) } else { None }
+        })
+        .collect();
+    let payload = json!({"version": 1, "name": format!("{} — {}", s.project.item(cid).map(|i| i.name.as_str()).unwrap_or("Shot"), layer.name),
+        "resolution": solve.size, "fpsNumerator": comp.frame_rate.num, "fpsDenominator": comp.frame_rate.den,
+        "startFrame": start, "endFrame": end, "sensorWidth": sensor, "unitScale": units,
+        "media": {"path": source_path, "kind": if footage.kind == FootageKind::Still {"FILE"} else {"MOVIE"},
+            "fps": source_fps, "nativeRate": footage.native_rate, "pixelAspect": footage.pixel_aspect, "timecode": footage.start_timecode,
+            "frameCount": source_count, "loopCount": footage.loop_count},
+        "frames": frames, "points": points, "markers": markers, "ground": solve.ground.is_some(),
+        "groundSize": world.s * units, "shutter": comp.shutter_angle / 360.0, "shutterPhase": comp.shutter_phase,
+        "solve": solve, "tracks": if include_points { tracks.as_deref() } else { None },
+        "warnings": warnings});
+    let data = serde_json::to_string(&payload).map_err(|e| bad(CMD, format!("cannot serialize scene: {e}")))?;
+    if data.len() > MAX_JSON {
+        return Err(bad(CMD, "scene exceeds the 64 MiB script limit; disable includePoints or split the shot"));
+    }
+    let quoted = serde_json::to_string(&data).map_err(|e| bad(CMD, format!("cannot encode scene: {e}")))?;
+    let script = include_str!("blender_scene.py").replace("__EFFECTCRAFT_DATA__", &quoted);
+    s.services.write_file(path, script.as_bytes()).map_err(|e| bad(CMD, format!("cannot write {path}: {e}")))?;
+    Ok(json!({"path": path, "bytes": script.len(), "frames": frames.len(), "points": points.len(), "warnings": warnings}))
+}
+
+struct Options<'a> {
+    path: &'a str,
+    sensor: f64,
+    units: f64,
+    start: i64,
+    include_points: bool,
+}
+
+impl<'a> Options<'a> {
+    fn parse(p: &'a Value) -> Result<Self> {
+        let path = str_p(p, "path").filter(|p| !p.is_empty() && !p.contains('\0')).ok_or_else(|| bad(CMD, "missing `path` (.py)"))?;
+        if !Path::new(path).extension().is_some_and(|e| e.eq_ignore_ascii_case("py")) {
+            return Err(bad(CMD, "the export path must end in .py"));
+        }
+        let sensor = number(p, "sensorWidth", 36.0, 1.0, 1000.0)?;
+        let units = number(p, "unitScale", 0.01, 0.000_001, 1000.0)?;
+        let start = match p.get("startFrame") {
+            None => 1,
+            Some(v) => v.as_i64().filter(|n| (1..=MAX_FRAME).contains(n)).ok_or_else(|| bad(CMD, "startFrame: expected a positive Blender frame number"))?,
+        };
+        let include_points = match p.get("includePoints") {
+            Some(v) if !v.is_boolean() => return Err(bad(CMD, "includePoints: expected a boolean")),
+            _ => b_p(p, "includePoints").unwrap_or(true),
+        };
+        Ok(Self { path, sensor, units, start, include_points })
+    }
+}
+
+struct Source<'a> {
+    footage: &'a Footage,
+    path: String,
+    fps: f64,
+    count: i64,
+}
+
+fn source<'a>(s: &'a Session, layer: &Layer, solve: &CameraSolve, path: &str) -> Result<Source<'a>> {
+    let footage = match layer.source {
+        LayerSource::Footage { item } => s.project.item(item).and_then(|i| match &i.kind {
+            ItemKind::Footage(f) => Some(f),
+            _ => None,
+        }),
+        _ => None,
+    }
+    .filter(|f| f.has_video && matches!(f.kind, FootageKind::Video | FootageKind::Still));
+    let footage = footage
+        .ok_or_else(|| bad(CMD, "Blender background export needs a video or still-footage layer; render precomps/sequences to a video and track that video"))?;
+    let source_path = media_path(s, &footage.path)?;
+    if Path::new(path) == Path::new(&source_path) {
+        return Err(bad(CMD, "the export path must differ from the source footage"));
+    }
+    if footage.width as f64 != solve.size[0] || footage.height as f64 != solve.size[1] {
+        return Err(bad(CMD, "the analysis image differs from the original footage dimensions; render the tracker's input to a video and track that video"));
+    }
+    let source_fps = footage.frame_rate.as_f64();
+    if footage.frame_rate.num <= 0 || footage.frame_rate.den <= 0 || !source_fps.is_finite() || source_fps <= 0.0 {
+        return Err(bad(CMD, "invalid source footage frame rate"));
+    }
+    // Same frame selection as the media pool: interpreted FPS, rounded per-loop frame count,
+    // clamp to the total loop range, then wrap. Native FPS does not change the frame index.
+    let divisor = (effectcraft_time::TICKS_PER_SECOND as i128).saturating_mul(footage.frame_rate.den as i128);
+    let source_count = (footage.duration.0 as i128).saturating_mul(footage.frame_rate.num as i128).saturating_add(divisor / 2) / divisor;
+    let source_count = if footage.kind == FootageKind::Still { 1 } else { source_count };
+    if !(1..=MAX_FRAME as i128).contains(&source_count) {
+        return Err(bad(CMD, "invalid footage duration or footage exceeds Blender's frame range; trim/render the source video first"));
+    }
+    let source_count = source_count as i64;
+    Ok(Source { footage, path: source_path, fps: source_fps, count: source_count })
+}
+
+fn scene_warnings(camera: Option<&Layer>, solve: &CameraSolve, footage: &Footage) -> Vec<String> {
+    let mut warnings = vec![
+        "Sensor width is assumed (36 mm by default); monocular tracking cannot recover physical sensor size or absolute scene scale.".to_string(),
+        "The original footage is referenced, not embedded or rendered: masks and effects before the tracker are not baked. Relink the video if moving this script.".to_string(),
+    ];
+    if camera.is_none() {
+        warnings
+            .push("No linked tracker camera: focus uses the default scene depth, DOF is off; optical focus cannot be recovered from feature tracks.".into());
+    } else {
+        warnings.push("Focus/iris settings are sampled from the linked camera; pose and lens come from the tracker solve. Blender's physical DOF is an approximation of EffectCraft's blur model.".into());
+    }
+    if solve.distortion.is_some_and(|d| !d.is_none()) {
+        warnings.push("Radial distortion is preserved as metadata (Brown k1/k2, half-diagonal normalization), not applied to Blender's pinhole camera. Use an undistorted plate for exact alignment.".into());
+    }
+    if (footage.pixel_aspect - 1.0).abs() > 1e-6 {
+        warnings.push("The tracker solves square pixels: export uses square pixels; original footage pixel aspect is retained in metadata.".into());
+    }
+    warnings
+}
+
+/// Bake the solved camera and the linked camera's optical settings at exact composition ticks.
+fn bake_frames(
+    ctx0: &EvalCtx<'_>,
+    layer: &Layer,
+    solve: &CameraSolve,
+    camera: Option<&Layer>,
+    options: &Options<'_>,
+    footage: &Footage,
+    source_count: i64,
+) -> Result<(Vec<Value>, linalg::Similarity)> {
+    let comp = ctx0.comp;
+    let lo = ctx0.time;
+    let fd = comp.frame_duration();
+    let sensor = options.sensor;
+    let units = options.units;
+    let start = options.start;
+    let first = solve.frames.first().ok_or_else(|| bad(CMD, "the camera solve is empty"))?;
+    let m = ctx0.world_matrix(layer).0;
+    let layer_scale = m[0][0].hypot(m[1][0]);
+    finite([layer_scale])?;
+    if layer_scale <= 1e-9 {
+        return Err(bad(CMD, "the tracked layer has zero scale"));
+    }
+    let world = solve.world([comp.width as f64, comp.height as f64], first.focal * layer_scale);
+    finite([world.s * units])?;
+    let mut frames = Vec::with_capacity(solve.frames.len());
+    for (i, frame) in solve.frames.iter().enumerate() {
+        let time = Tick(lo.0.saturating_add(fd.0.saturating_mul(i as i64)));
+        let ctx = ctx0.at(time);
+        let pose = linalg::mm(&world.r, &linalg::mt(&frame.r()));
+        let right = position(linalg::mv(&pose, [1.0, 0.0, 0.0]), 1.0);
+        let up = position(linalg::mv(&pose, [0.0, -1.0, 0.0]), 1.0);
+        let back = position(linalg::mv(&pose, [0.0, 0.0, -1.0]), 1.0);
+        let location = position(world.apply(frame.center), units);
+        let lens = frame.focal * sensor / solve.size[0];
+        let opts = camera.and_then(|l| l.props.sub("cameraOptions").map(|g| (l, g)));
+        let value = |key: &str, fallback: f64| opts.map(|(l, g)| ctx.f(l, g, key, fallback)).unwrap_or(fallback);
+        let focus = value("focusDistance", world.s) * units;
+        let aperture = value("aperture", 0.0);
+        let zoom = value("zoom", frame.focal * layer_scale);
+        // Match Camera Settings' f-stop conversion: focal_for_zoom uses a 36 mm film width,
+        // and the aperture UI is mm scaled by comp_width / 1920 (not a world-space diameter).
+        let aperture_mm = aperture * 1920.0 / comp.width as f64;
+        let fstop = if aperture_mm > 0.0 { (zoom * 36.0 / comp.width as f64) / aperture_mm } else { 2.8 };
+        let rotation = value("irisRotation", 0.0).to_radians();
+        let ratio = value("irisAspectRatio", 1.0);
+        let shape = opts.map(|(l, g)| ctx.e(l, g, "irisShape")).unwrap_or(0);
+        let blades = match shape {
+            0 => 4,
+            1..=8 => shape.saturating_add(2),
+            _ => return Err(bad(CMD, "invalid iris shape")),
+        };
+        let dof = opts.is_some_and(|(l, g)| ctx.b(l, g, "dof")) && aperture > 0.0 && value("blurLevel", 100.0) > 0.0;
+        let source_time = ctx.source_time(layer);
+        let source_frame = if footage.kind == FootageKind::Still {
+            0
+        } else {
+            footage.frame_rate.frame_at(source_time).clamp(0, source_count.saturating_mul(footage.loop_count.max(1) as i64).saturating_sub(1)) % source_count
+        };
+        finite(location.into_iter().chain([focus, aperture, zoom, fstop, rotation, ratio, value("blurLevel", 100.0), value("irisRoundness", 0.0)]))?;
+        if focus <= 0.0 || !(0.01..=100.0).contains(&ratio) || !(0.01..=1e6).contains(&fstop) {
+            return Err(bad(CMD, "focus, f-stop or iris aspect is outside Blender's supported range"));
+        }
+        frames.push(json!({"frame": start + i as i64, "timeTicks": time.0, "sourceFrame": source_frame,
+            "location": location, "rotation": [right, up, back], "lens": lens, "focus": focus, "dof": dof,
+            "fstop": fstop, "blades": blades, "irisRotation": rotation, "irisRatio": ratio,
+            "sourceAperture": aperture, "sourceZoom": zoom,
+            "blurLevel": value("blurLevel", 100.0), "irisRoundness": value("irisRoundness", 0.0)}));
+    }
+    Ok((frames, world))
+}
diff --git a/crates/engine/src/cmd/blender/validate.rs b/crates/engine/src/cmd/blender/validate.rs
new file mode 100644
index 000000000..a9454861f
--- /dev/null
+++ b/crates/engine/src/cmd/blender/validate.rs
@@ -0,0 +1,71 @@
+//! Validate solved geometry and its correspondence to the current layer timing.
+
+use effectcraft_project::{Comp, Layer};
+use effectcraft_time::Tick;
+use effectcraft_track::camtrack::{CameraSolve, linalg};
+
+use super::{CMD, MAX_FRAME, MAX_FRAMES, MAX_POINTS, bad, finite};
+use crate::Result;
+
+pub(super) fn timing(comp: &Comp, layer: &Layer, solve: &CameraSolve, start: i64) -> Result<(Tick, i64)> {
+    if solve.frames.len() > MAX_FRAMES || solve.points.len() > MAX_POINTS {
+        return Err(bad(CMD, "export is limited to 100,000 frames and 100,000 points; split the shot"));
+    }
+    if solve.size.iter().any(|v| !v.is_finite() || *v < 4.0 || *v > 65_536.0 || v.fract() != 0.0) {
+        return Err(bad(CMD, "invalid tracking resolution (expected 4..65536 whole pixels)"));
+    }
+    let fps = comp.frame_rate.as_f64();
+    if comp.frame_rate.num <= 0 || comp.frame_rate.den <= 0 || !fps.is_finite() || !(1.0..=1000.0).contains(&fps) {
+        return Err(bad(CMD, "invalid composition frame rate (expected 1..1000 fps)"));
+    }
+    let end = start
+        .checked_add(solve.frames.len() as i64)
+        .and_then(|n| n.checked_sub(1))
+        .filter(|n| *n <= MAX_FRAME)
+        .ok_or_else(|| bad(CMD, "the baked animation exceeds Blender's frame range"))?;
+    finite([solve.start, solve.frame_duration, solve.average_error, layer.stretch, comp.shutter_angle, comp.shutter_phase])?;
+    if layer.stretch == 0.0 || comp.width == 0 || comp.height == 0 {
+        return Err(bad(CMD, "invalid composition dimensions or zero layer stretch"));
+    }
+    let lo = comp.frame_rate.snap_nearest(layer.in_point.max(Tick::ZERO));
+    let hi = layer.out_point.min(comp.duration);
+    let fd = comp.frame_duration();
+    if fd.0 <= 0 || lo >= hi {
+        return Err(bad(CMD, "the tracked layer has no active frames"));
+    }
+    let expected = ((hi.0 as i128 - lo.0 as i128 + fd.0 as i128 - 1) / fd.0 as i128) as u128;
+    if expected != solve.frames.len() as u128 {
+        return Err(bad(CMD, "the solve no longer matches the layer's frame range; re-analyze the tracker"));
+    }
+    let dt = (layer.layer_time(lo + fd) - layer.layer_time(lo)).seconds();
+    if (solve.start - layer.layer_time(lo).seconds()).abs() > 1e-6 || solve.frames.len() > 1 && (solve.frame_duration - dt).abs() > 1e-6 {
+        return Err(bad(CMD, "the solve no longer matches the layer's timing; re-analyze the tracker"));
+    }
+    Ok((lo, end))
+}
+
+pub(super) fn geometry(solve: &CameraSolve, sensor: f64) -> Result<()> {
+    for frame in &solve.frames {
+        finite(frame.rot.into_iter().chain(frame.center).chain([frame.focal]))?;
+        if !frame.solved || frame.focal <= 0.0 {
+            return Err(bad(CMD, "the solve contains unsolved frames or invalid focal lengths; re-analyze the tracker"));
+        }
+        let mm = sensor * frame.focal / solve.size[0];
+        if !(1.0..=5000.0).contains(&mm) {
+            return Err(bad(CMD, "lens outside Blender's 1..5000 mm range; choose another sensorWidth"));
+        }
+    }
+    if let Some(ground) = &solve.ground {
+        finite(ground.origin.into_iter().chain(ground.normal).chain(ground.x_axis))?;
+        if (linalg::norm(ground.normal) - 1.0).abs() > 1e-4
+            || (linalg::norm(ground.x_axis) - 1.0).abs() > 1e-4
+            || linalg::dot(ground.normal, ground.x_axis).abs() > 1e-4
+        {
+            return Err(bad(CMD, "invalid ground-plane basis; set the ground plane again"));
+        }
+    }
+    if let Some(d) = &solve.distortion {
+        finite([d.k1, d.k2, d.radius])?;
+    }
+    Ok(())
+}
diff --git a/crates/engine/src/cmd/blender_scene.py b/crates/engine/src/cmd/blender_scene.py
new file mode 100644
index 000000000..0a9700a00
--- /dev/null
+++ b/crates/engine/src/cmd/blender_scene.py
@@ -0,0 +1,204 @@
+# EffectCraft camera tracker → Blender, original code under MIT OR Apache-2.0.
+# Run in Blender's Scripting workspace (Open, Run Script), or:
+# blender --background --python "Tracked Scene.py"
+# Creates a NEW scene; existing scenes and objects are preserved. Save the .blend yourself.
+# Public API types: bpy.types.Camera, bpy.types.ImageUser
+import json
+import math
+import os
+
+import bpy
+from mathutils import Matrix
+
+DATA = json.loads(__EFFECTCRAFT_DATA__)
+
+
+def _curves(owner):
+    """Blender 4.0–4.3 legacy actions and 4.4+/5.x layered actions."""
+    anim = owner.animation_data
+    if anim is None or anim.action is None:
+        return
+    action = anim.action
+    if getattr(action, "is_action_layered", False):
+        for layer in action.layers:
+            for strip in layer.strips:
+                if strip.type == 'KEYFRAME':
+                    bag = strip.channelbag(anim.action_slot)
+                    if bag is not None:
+                        yield from bag.fcurves
+    else:
+        yield from action.fcurves
+
+
+def _interpolation(owner):
+    for curve in _curves(owner):
+        # Footage indices and discrete switches must never interpolate between frames.
+        stepped = ("frame_offset" in curve.data_path or "use_dof" in curve.data_path
+                   or "aperture_blades" in curve.data_path)
+        for key in curve.keyframe_points:
+            key.interpolation = 'CONSTANT' if stepped else 'LINEAR'
+
+
+def _media_path():
+    original = DATA["media"]["path"]
+    candidates = [original]
+    # When sharing, place the video alongside the script or the .blend and run again.
+    script_path = globals().get("__file__", "")
+    if script_path:
+        candidates.append(os.path.join(os.path.dirname(os.path.abspath(script_path)),
+                                       os.path.basename(original)))
+    if bpy.data.filepath:
+        candidates.append(os.path.join(os.path.dirname(bpy.data.filepath),
+                                       os.path.basename(original)))
+    return next((p for p in candidates if os.path.isfile(p)), None)
+
+
+def import_scene():
+    if bpy.app.version < (4, 0, 0):
+        raise RuntimeError("EffectCraft scene import requires Blender 4.0 or newer")
+    scene = bpy.data.scenes.new(DATA["name"])
+    scene.frame_start = DATA["startFrame"]
+    scene.frame_end = DATA["endFrame"]
+    fps = DATA["fpsNumerator"] / DATA["fpsDenominator"]
+    scene.render.fps = max(1, round(fps))
+    scene.render.fps_base = scene.render.fps / fps
+    scene.render.resolution_x, scene.render.resolution_y = map(int, DATA["resolution"])
+    scene.render.resolution_percentage = 100
+    # The tracker assumes square pixels, regardless of the source's interpretation metadata.
+    scene.render.pixel_aspect_x = scene.render.pixel_aspect_y = 1.0
+    scene.render.film_transparent = True
+    scene.render.motion_blur_shutter = max(0.0, min(2.0, DATA["shutter"]))
+    scene.unit_settings.system = 'METRIC'
+    scene.unit_settings.scale_length = 1.0
+    scene["effectcraft_unit_scale"] = DATA["unitScale"]
+    scene["effectcraft_scale_is_arbitrary"] = True
+    scene["effectcraft_shutter_phase_degrees"] = DATA["shutterPhase"]
+
+    collection = bpy.data.collections.new("EffectCraft Tracking")
+    scene.collection.children.link(collection)
+    camera_data = bpy.data.cameras.new("3D Tracker Camera")
+    camera = bpy.data.objects.new("3D Tracker Camera", camera_data)
+    collection.objects.link(camera)
+    scene.camera = camera
+    camera.rotation_mode = 'QUATERNION'
+    camera_data.type = 'PERSP'
+    camera_data.sensor_fit = 'HORIZONTAL'
+    camera_data.sensor_width = DATA["sensorWidth"]
+    camera_data.sensor_height = (DATA["sensorWidth"] * DATA["resolution"][1]
+                                 / DATA["resolution"][0])
+    camera_data.show_background_images = True
+    camera_data.show_limits = True
+    extent = max([DATA["groundSize"], 1.0]
+                 + [math.dist(p["location"], f["location"])
+                    for p in DATA["points"][::max(1, len(DATA["points"]) // 100)]
+                    for f in DATA["frames"][::max(1, len(DATA["frames"]) // 10)]])
+    camera_data.clip_start = max(0.00001, min(0.1, extent / 10000.0))
+    camera_data.clip_end = max(1000.0, extent * 10.0)
+
+    previous = None
+    for sample in DATA["frames"]:
+        frame = sample["frame"]
+        camera.location = sample["location"]
+        # Exported right/up/back vectors are COLUMNS of Blender's local → world basis.
+        quaternion = Matrix(sample["rotation"]).transposed().to_quaternion()
+        if previous is not None and previous.dot(quaternion) < 0:
+            quaternion.negate()
+        camera.rotation_quaternion = quaternion
+        previous = quaternion.copy()
+        camera.keyframe_insert(data_path="location", frame=frame)
+        camera.keyframe_insert(data_path="rotation_quaternion", frame=frame)
+        camera_data.lens = sample["lens"]
+        camera_data.keyframe_insert(data_path="lens", frame=frame)
+        camera_data.dof.use_dof = sample["dof"]
+        camera_data.dof.focus_distance = sample["focus"]
+        camera_data.dof.aperture_fstop = sample["fstop"]
+        camera_data.dof.aperture_blades = sample["blades"]
+        camera_data.dof.aperture_rotation = (sample["irisRotation"] + math.pi) % math.tau - math.pi
+        camera_data.dof.aperture_ratio = sample["irisRatio"]
+        for prop in ("use_dof", "focus_distance", "aperture_fstop", "aperture_blades",
+                     "aperture_rotation", "aperture_ratio"):
+            camera_data.keyframe_insert(data_path="dof." + prop, frame=frame)
+
+    path = _media_path()
+    if path is not None:
+        try:
+            image = bpy.data.images.load(path, check_existing=False)
+            image.source = DATA["media"]["kind"]
+            background = camera_data.background_images.new()
+            background.source = 'IMAGE'
+            background.image = image
+            background.alpha = 1.0
+            background.display_depth = 'BACK'
+            background.frame_method = 'STRETCH'
+            user = background.image_user
+            user.use_auto_refresh = True
+            user.use_cyclic = False
+            user.frame_start = DATA["startFrame"]
+            user.frame_duration = max(1, min(1048574, image.frame_duration))
+            if image.source == 'MOVIE':
+                for sample in DATA["frames"]:
+                    # Blender uses 1-based image frames; sourceFrame is 0-based.
+                    user.frame_offset = sample["sourceFrame"] - (sample["frame"] - user.frame_start)
+                    camera_data.keyframe_insert(
+                        data_path="background_images[0].image_user.frame_offset",
+                        frame=sample["frame"])
+        except (RuntimeError, ValueError, OSError) as error:
+            DATA["warnings"].append("Blender could not load the background video: " + str(error))
+    else:
+        DATA["warnings"].append("Video not found: " + DATA["media"]["path"]
+                                + ". Place it beside this script or relink the camera background.")
+
+    if DATA["points"]:
+        mesh = bpy.data.meshes.new("Solved Track Points")
+        mesh.from_pydata([p["location"] for p in DATA["points"]], [], [])
+        mesh.update()
+        cloud = bpy.data.objects.new("Solved Track Points", mesh)
+        collection.objects.link(cloud)
+        cloud.show_in_front = True
+        cloud.hide_render = True
+        for name, kind, key in (("track_id", 'INT', "id"), ("reprojection_error", 'FLOAT', "error"),
+                                ("first_frame", 'INT', "first"), ("last_frame", 'INT', "last")):
+            attr = mesh.attributes.new(name=name, type=kind, domain='POINT')
+            for dest, point in zip(attr.data, DATA["points"]):
+                # Track IDs are u32 in EffectCraft; keep the full IDs in the JSON text too.
+                dest.value = point[key] if kind == 'FLOAT' else min(2147483647, point[key])
+
+    if DATA["ground"]:
+        size = DATA["groundSize"]
+        mesh = bpy.data.meshes.new("Solved Ground Plane")
+        mesh.from_pydata([(-size, -size, 0), (size, -size, 0),
+                          (size, size, 0), (-size, size, 0)], [], [(0, 1, 2, 3)])
+        mesh.update()
+        ground = bpy.data.objects.new("Solved Ground Plane", mesh)
+        collection.objects.link(ground)
+        ground.display_type = 'WIRE'
+        ground.hide_render = True
+    for marker in DATA["markers"]:
+        scene.timeline_markers.new(marker["name"], frame=marker["frame"])
+
+    _interpolation(camera)
+    _interpolation(camera_data)
+    metadata = bpy.data.texts.new("EffectCraft Tracking Metadata.json")
+    metadata.write(json.dumps(DATA, ensure_ascii=False, indent=2))
+    scene["effectcraft_metadata_text"] = metadata.name
+    camera_data["effectcraft_average_error_pixels"] = DATA["solve"]["averageError"]
+    camera_data["effectcraft_solve_method"] = DATA["solve"]["methodUsed"]
+    camera_data["effectcraft_focus_source"] = "See warnings in " + metadata.name
+    distortion = DATA["solve"].get("distortion")
+    if distortion:
+        for key in ("k1", "k2", "radius"):
+            camera_data["effectcraft_distortion_" + key] = distortion[key]
+    if bpy.context.window is not None:
+        bpy.context.window.scene = scene
+        for area in bpy.context.window.screen.areas:
+            if area.type == 'VIEW_3D':
+                area.spaces.active.region_3d.view_perspective = 'CAMERA'
+    scene.frame_set(scene.frame_start)
+    for warning in DATA["warnings"]:
+        print("EffectCraft: " + warning)
+    print("EffectCraft: imported", len(DATA["frames"]), "baked camera frames into", scene.name)
+    return scene
+
+
+if __name__ == "__main__":
+    EFFECTCRAFT_SCENE = import_scene()
diff --git a/crates/engine/src/cmd/camera_cmds.rs b/crates/engine/src/cmd/camera_cmds.rs
index 68cd14fb9..e717d51cc 100644
--- a/crates/engine/src/cmd/camera_cmds.rs
+++ b/crates/engine/src/cmd/camera_cmds.rs
@@ -42,11 +42,25 @@ pub fn specs() -> Vec<CommandSpec> {
             create_from_solve
         ),
         cmd!("camera.create", "Create Camera", [], None, "{layer?, effect?}", has_comp, |s, p| create_from_solve(s, &with_kind(p, "camera"))),
+        cmd!(
+            "camera.exportBlender",
+            "Export Scene to Blender...",
+            [],
+            None,
+            "{path: .py, comp?, layer?, effect?, sensorWidth?: mm (default 36), unitScale?: Blender units per comp pixel (default 0.01), startFrame?: positive integer (default 1), includePoints?: true}",
+            has_comp,
+            export_blender
+        ),
         cmd!("camera.setGroundPlane", "Set Ground Plane and Origin", [], None, "{points?: [id] (default: selected), layer?, effect?}", has_comp, set_ground),
         cmd!("camera.deletePoints", "Delete Selected Points", [], None, "{points?: [id] (default: selected), layer?, effect?, wait?}", has_comp, delete_points),
     ]
 }
 
+fn export_blender(s: &mut Session, p: &Value) -> Result<Value> {
+    let (cid, lid, uid) = ct_p(s, p, "camera.exportBlender")?;
+    super::blender::export(s, p, cid, lid, uid)
+}
+
 fn with_kind(p: &Value, kind: &str) -> Value {
     let mut q = p.clone();
     if !q.is_object() {
diff --git a/crates/engine/src/cmd/paths.rs b/crates/engine/src/cmd/paths.rs
index 0bb2eaae2..8364f67ec 100644
--- a/crates/engine/src/cmd/paths.rs
+++ b/crates/engine/src/cmd/paths.rs
@@ -5,6 +5,7 @@
 use effectcraft_keyframe::{ShapePath, Value as KV};
 use effectcraft_project::build::{self, Ids};
 use effectcraft_project::{FeatherFalloff, GroupKind, ItemId, LayerId, LayerSource, MaskMotionBlur, Node, PropGroup, Uid};
+use effectcraft_render::EvalCtx;
 use serde_json::{Value, json};
 
 use super::layer_menu::target_masks;
@@ -111,18 +112,30 @@ fn roto_bezier(s: &mut Session, p: &Value) -> Result<Value> {
 /// The parametric shape paths that Convert To Bezier Path replaces with an editable path.
 const PARAMETRIC: [&str; 3] = ["rect", "ellipse", "star"];
 
-/// The path a parametric shape group draws, in the group's own space, read at `lt`. This is the
-/// geometry the renderer builds from the same values (`render::shapes::collect`), so the converted
-/// path is the shape that was on screen rather than an approximation of it; the defaults match
-/// that code for a property a group doesn't carry (a polygon has no inner radius or roundness).
-fn parametric_path(g: &PropGroup, lt: effectcraft_time::Tick) -> Option<ShapePath> {
-    let f = |id: &str, d: f64| g.prop(id).map_or(d, |pr| pr.value_at(lt).as_f64());
-    let v2 = |id: &str, d: [f64; 2]| g.prop(id).map_or(d, |pr| pr.value_at(lt).as_vec2());
+/// The path a parametric shape group draws, in the group's own space. This is the geometry the
+/// renderer builds from the same values (`render::shapes::collect`), expressions included, so the
+/// converted path is the shape that was on screen rather than an approximation of it; the defaults
+/// match that code for a property a group doesn't carry (a polygon has no inner radius or
+/// roundness).
+fn parametric_path(ctx: &EvalCtx, layer: &effectcraft_project::Layer, g: &PropGroup) -> Option<ShapePath> {
+    let f = |id: &str, d: f64| ctx.f(layer, g, id, d);
+    let v2 = |id: &str, d: [f64; 2]| ctx.v2(layer, g, id, d);
     let path = match g.match_id.as_str() {
-        "rect" => effectcraft_path::rect(v2("size", [100.0; 2]), v2("position", [0.0; 2]), f("roundness", 0.0)),
+        "rect" => {
+            let (size, pos) = (v2("size", [100.0; 2]), v2("position", [0.0; 2]));
+            if ctx.b(layer, g, "perCorner") {
+                effectcraft_path::rect_radii(
+                    size,
+                    pos,
+                    [f("topLeftRoundness", 0.0), f("topRightRoundness", 0.0), f("bottomRightRoundness", 0.0), f("bottomLeftRoundness", 0.0)],
+                )
+            } else {
+                effectcraft_path::rect(size, pos, f("roundness", 0.0))
+            }
+        }
         "ellipse" => effectcraft_path::ellipse(v2("size", [100.0; 2]), v2("position", [0.0; 2])),
         "star" => effectcraft_path::polystar(effectcraft_path::Polystar {
-            star: g.prop("type").map_or(0, |pr| pr.value_at(lt).as_enum()) == 0,
+            star: ctx.e(layer, g, "type") == 0,
             points: f("points", 5.0),
             pos: v2("position", [0.0; 2]),
             rotation: f("rotation", 0.0),
@@ -160,28 +173,38 @@ fn convert_to_bezier(s: &mut Session, p: &Value) -> Result<Value> {
     }
     let t = s.time();
     let n = shapes.len();
+    // Read the geometry before editing, with the same expression-aware context the renderer
+    // uses: an expression-driven corner radius, size or position must convert to what is on
+    // screen, not to the property's underlying value.
+    let prepared = {
+        let comp = s.project.comp(cid).ok_or(EngineError::NoComp)?;
+        let ctx = EvalCtx { expr: s.expr.as_deref(), ..EvalCtx::new(&s.project, cid, comp, t) };
+        let mut prepared = Vec::new();
+        for (lid, uid) in &shapes {
+            let Some(l) = comp.layer(*lid) else { continue };
+            let Some(old) = l.props.sub("contents").and_then(|c| c.find_group(*uid)) else { continue };
+            let Some(path) = parametric_path(&ctx, l, old) else { continue };
+            // Path Direction is the shape's own, not a default: reversing is a separate command.
+            prepared.push((*lid, *uid, path, ctx.e(l, old, "direction"), old.enabled));
+        }
+        prepared
+    };
     let made = s.edit("Convert To Bezier Path", None, |proj, st| {
         let mut next = proj.next_id;
         let mut made = Vec::new();
-        for (lid, uid) in &shapes {
-            let l = layer_mut(proj, cid, *lid)?;
-            let lt = l.layer_time(t);
+        for (lid, uid, path, direction, enabled) in prepared {
+            let l = layer_mut(proj, cid, lid)?;
             let contents = l.props.sub_mut("contents").ok_or_else(|| bad("path.convertToBezier", "not a shape layer"))?;
-            let Some(old) = contents.find_group(*uid) else { continue };
-            let Some(path) = parametric_path(old, lt) else { continue };
-            // Path Direction is the shape's own, not a default: reversing is a separate command.
-            let direction = old.prop("direction").map_or(0, |pr| pr.value_at(lt).as_enum());
-            let enabled = old.enabled;
             let mut g = build::shape_path(&mut Ids(&mut next), path);
             if let Some(pr) = g.prop_mut("direction") {
                 pr.value = KV::Enum(direction);
             }
             g.enabled = enabled;
             let new_uid = g.uid;
-            let parent = contents.parent_of_mut(*uid).ok_or_else(|| bad("path.convertToBezier", "no such shape item"))?;
-            let Some(at) = parent.children.iter().position(|c| c.uid() == *uid) else { continue };
+            let parent = contents.parent_of_mut(uid).ok_or_else(|| bad("path.convertToBezier", "no such shape item"))?;
+            let Some(at) = parent.children.iter().position(|c| c.uid() == uid) else { continue };
             parent.children[at] = Node::Group(g);
-            made.push((*lid, new_uid));
+            made.push((lid, new_uid));
         }
         proj.next_id = next;
         // The new paths are what is selected, so the vertices can be edited straight away.
diff --git a/crates/engine/src/cmd/scripts.rs b/crates/engine/src/cmd/scripts.rs
index 7ad0d34c3..8c14e03ec 100644
--- a/crates/engine/src/cmd/scripts.rs
+++ b/crates/engine/src/cmd/scripts.rs
@@ -581,6 +581,15 @@ pub fn specs() -> Vec<CommandSpec> {
             always,
             scriptui::mouse
         ),
+        cmd!(
+            "scriptui.resize",
+            "Resize Script Window",
+            [],
+            None,
+            "{window?, size: [width, height] (pixels)} → the window takes the size, lays itself out again and its onResizing / onResize run (a docked ScriptUI panel gets its dock's size)",
+            always,
+            scriptui::resize
+        ),
         cmd!(
             "scriptui.close",
             "Close Script Window",
diff --git a/crates/engine/src/scriptui.rs b/crates/engine/src/scriptui.rs
index 1ad4b9a40..2c211e77a 100644
--- a/crates/engine/src/scriptui.rs
+++ b/crates/engine/src/scriptui.rs
@@ -769,6 +769,17 @@ pub(crate) fn mouse(s: &mut Session, p: &Value) -> Result<Value> {
     dispatch(s, ScriptUiEvent { window, widget, kind: (*ty).to_string(), value })
 }
 
+/// `scriptui.resize`: the host gave the window a new size (a docked panel's dock, #2585): the
+/// script's window takes it, lays itself out again and gets `onResizing` / `onResize`.
+pub(crate) fn resize(s: &mut Session, p: &Value) -> Result<Value> {
+    let c = "scriptui.resize";
+    let window = window_p(s, p, c)?;
+    let size = p.get("size").and_then(Value::as_array).ok_or_else(|| crate::commands::bad(c, "missing `size` [width, height]"))?;
+    let side = |i: usize| size.get(i).and_then(Value::as_f64).filter(|v| v.is_finite()).map(|v| v.round().clamp(1.0, 16384.0));
+    let (Some(w), Some(h)) = (side(0), side(1)) else { return Err(crate::commands::bad(c, "`size` must be [width, height] in pixels")) };
+    dispatch(s, ScriptUiEvent { window, widget: 0, kind: "resize".into(), value: json!([w, h]) })
+}
+
 /// `scriptui.close`: close a window (a dialog's `show()` returns `result`, default 2 = Cancel).
 pub(crate) fn close(s: &mut Session, p: &Value) -> Result<Value> {
     let window = window_p(s, p, "scriptui.close")?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 82aa011a2..26092967f 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -1,5 +1,6 @@
 mod anim_presets;
 mod anim_tools;
+mod blender;
 mod camera_track;
 mod codec_options;
 mod color_view;
diff --git a/crates/engine/src/tests/blender.rs b/crates/engine/src/tests/blender.rs
new file mode 100644
index 000000000..84e939055
--- /dev/null
+++ b/crates/engine/src/tests/blender.rs
@@ -0,0 +1,261 @@
+//! Synthetic camera interchange: projection, timing, DOF and hostile inputs. Optional public
+//! Blender-API oracle: EFFECTCRAFT_BLENDER=/path/to/blender cargo test -p effectcraft-engine tests::blender -- --nocapture.
+
+use effectcraft_effects::camera_tracker as ct;
+use effectcraft_keyframe::Value as KV;
+use effectcraft_project::{Footage, FootageKind, ItemKind, LayerId, LayerSource, build};
+use effectcraft_time::{FrameRate, Tick};
+use effectcraft_track::camtrack::{CameraSolve, Distortion, Ground, ShotType, SolveMethod, SolvedFrame, SolvedPoint};
+use serde_json::{Value, json};
+
+use crate::Session;
+
+fn path(name: &str) -> String {
+    let dir = std::env::temp_dir().join(format!("effectcraft-blender-tests-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    dir.join(name).to_string_lossy().into_owned()
+}
+
+fn fixture(ground: bool) -> (Session, LayerId, u64) {
+    let mut s = Session::default();
+    s.execute("comp.new", json!({"name": "Shot '\\ — câmera", "width": 640, "height": 360, "duration": 6})).unwrap();
+    let cid = s.active_comp_id().unwrap();
+    let rate = FrameRate::new(30000, 1001);
+    let lid = s
+        .edit("fixture", None, |p, _| {
+            p.comp_mut(cid).unwrap().frame_rate = rate;
+            let item = p.add_item(
+                "Plate",
+                Default::default(),
+                None,
+                ItemKind::Footage(Footage {
+                    path: std::env::var("EFFECTCRAFT_BLENDER_PLATE").unwrap_or_else(|_| path("plate '\\ — vídeo.mp4")),
+                    width: 640,
+                    height: 360,
+                    frame_rate: FrameRate::FPS_30,
+                    duration: Tick::from_seconds_f64(6.0),
+                    kind: FootageKind::Video,
+                    has_video: true,
+                    ..Default::default()
+                }),
+            );
+            let comp = p.comp(cid).unwrap().clone();
+            let mut layer = build::layer(p, &comp, "Tracked Video", LayerSource::Footage { item }, (640, 360), None);
+            layer.in_point = rate.tick_of(60);
+            layer.out_point = rate.tick_of(63);
+            layer.start_time = rate.tick_of(30);
+            layer.stretch = 200.0;
+            let id = layer.id;
+            p.comp_mut(cid).unwrap().layers.push(layer);
+            Ok(id)
+        })
+        .unwrap();
+    let uid = s.execute("effect.apply", json!({"effect": ct::ID, "layers": [lid.0]})).unwrap()["effects"][0].as_u64().unwrap();
+    let solve = CameraSolve {
+        version: 1,
+        size: [640.0, 360.0],
+        start: rate.tick_of(30).seconds() / 2.0,
+        frame_duration: rate.frame_duration().seconds() / 2.0,
+        shot: ShotType::VariableZoom,
+        method_used: SolveMethod::Typical,
+        average_error: 0.12,
+        frames: (0..3)
+            .map(|i| SolvedFrame {
+                rot: [0.02 * i as f64, -0.03 * i as f64, 0.01 * i as f64],
+                center: [0.1 * i as f64, -0.01 * i as f64, 0.02 * i as f64],
+                focal: 600.0 + i as f64 * 25.0,
+                solved: true,
+            })
+            .collect(),
+        points: vec![
+            SolvedPoint { id: 7, pos: [0.1, 0.2, 2.0], error: 0.13, first: 0, last: 2 },
+            SolvedPoint { id: 9, pos: [-0.3, -0.1, 1.2], error: 0.11, first: 0, last: 1 },
+        ],
+        ground: ground.then_some(Ground { origin: [0.1, 0.2, 2.0], normal: [0.0, -1.0, 0.0], x_axis: [1.0, 0.0, 0.0] }),
+        distortion: ground.then_some(Distortion { k1: 0.01, k2: -0.002, radius: 320.0_f64.hypot(180.0) }),
+    };
+    // Directly install a deterministic solve; no analysis or decoder is needed by these tests.
+    s.execute("prop.set", json!({"layer": lid.0, "path": "effects/#1/solve", "value": solve.to_json()})).unwrap();
+    s.camera_pending.clear();
+    s.execute("layer.select", json!({"layers": [lid.0]})).unwrap();
+    (s, lid, uid)
+}
+
+fn data(script: &str) -> Value {
+    let line = script.lines().find_map(|l| l.strip_prefix("DATA = json.loads(")).unwrap().strip_suffix(')').unwrap();
+    let encoded: String = serde_json::from_str(line).unwrap();
+    serde_json::from_str(&encoded).unwrap()
+}
+
+#[test]
+fn blender_export_bakes_projection_focus_and_retimed_background() {
+    let (mut s, lid, uid) = fixture(true);
+    let result = s.execute("camera.create", json!({"layer": lid.0, "effect": uid})).unwrap();
+    let camera = result["camera"].as_u64().unwrap();
+    s.execute("layer.cameraSettings", json!({"layer": camera, "focusDistance": 800.0, "dof": true, "fStop": 4.0, "lockToZoom": false})).unwrap();
+    for (frame, value) in [(60, 800.0), (62, 1000.0)] {
+        let time = FrameRate::new(30000, 1001).tick_of(frame).seconds();
+        s.execute("prop.addKey", json!({"layer": camera, "path": "cameraOptions/focusDistance", "time": time, "value": value})).unwrap();
+    }
+    let camera_layer = s.active_comp().unwrap().layer(LayerId(camera)).unwrap();
+    assert!(camera_layer.props.prop("cameraOptions/dof").unwrap().value.as_bool());
+    let output = path("oracle-scene.py");
+    let before = s.project.to_json();
+    let r = s.execute_checked("camera.exportBlender", json!({"layer": lid.0, "effect": uid, "path": output, "startFrame": 101})).unwrap();
+    assert_eq!(s.project.to_json(), before, "export must not edit the document");
+    assert_eq!(r["frames"], 3);
+    assert_eq!(r["points"], 2);
+    let script = std::fs::read_to_string(&output).unwrap();
+    let d = data(&script);
+    assert_eq!(d["resolution"], json!([640.0, 360.0]));
+    assert_eq!(d["fpsNumerator"], 30000);
+    assert_eq!(d["fpsDenominator"], 1001);
+    assert_eq!(d["frames"][0]["sourceFrame"], 15, "trim + 200% stretch, not scene frame 101");
+    assert_eq!(d["frames"][2]["sourceFrame"], 16);
+    assert_eq!(d["frames"][0]["focus"], 8.0);
+    assert_eq!(d["frames"][2]["focus"], 10.0);
+    assert_eq!(d["frames"][0]["dof"], true);
+    assert!((d["frames"][0]["fstop"].as_f64().unwrap() - 4.0).abs() < 1e-6);
+    assert_eq!(d["frames"][0]["lens"], 33.75);
+    assert_eq!(d["frames"][2]["lens"], 36.5625);
+    assert_eq!(d["ground"], true);
+    assert_eq!(d["solve"]["distortion"]["k1"], 0.01);
+    assert_eq!(d["points"][0]["location"][2], 0.0, "ground point lies on Blender XY plane");
+
+    // Execute the actual exported artifact in a separately installed Blender, when requested.
+    if let Ok(blender) = std::env::var("EFFECTCRAFT_BLENDER") {
+        let oracle = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/blender_scene_oracle.py");
+        let output = std::process::Command::new(blender)
+            .args(["--background", "--factory-startup", "--python-exit-code", "1", "--python"])
+            .arg(oracle)
+            .arg("--")
+            .arg(&output)
+            .output()
+            .unwrap();
+        assert!(output.status.success(), "Blender oracle failed:\n{}\n{}", String::from_utf8_lossy(&output.stdout), String::from_utf8_lossy(&output.stderr));
+        assert!(String::from_utf8_lossy(&output.stdout).contains("EFFECTCRAFT_BLENDER_ORACLE_OK"));
+    }
+}
+
+#[test]
+fn blender_export_bakes_reverse_time_remap_and_footage_loops() {
+    let (mut s, lid, _) = fixture(false);
+    let cid = s.active_comp_id().unwrap();
+    let rate = FrameRate::new(30000, 1001);
+    s.edit("retimed fixture", None, |p, _| {
+        let layer = p.comp(cid).unwrap().layer(lid).unwrap();
+        let item = layer.source.item().unwrap();
+        let keys = [(60, 8.0), (61, 6.0), (62, -1.0)]
+            .map(|(frame, time)| effectcraft_keyframe::Keyframe::new(layer.layer_time(rate.tick_of(frame)), KV::Scalar(time)));
+        let mut remap = build::Ids(&mut p.next_id).prop("timeRemap", "Time Remap", KV::Scalar(8.0));
+        remap.keys = keys.to_vec();
+        p.comp_mut(cid).unwrap().layer_mut(lid).unwrap().props.children.push(remap.into());
+        if let ItemKind::Footage(f) = &mut p.item_mut(item).unwrap().kind {
+            f.loop_count = 2;
+        }
+        Ok(())
+    })
+    .unwrap();
+    let output = path("remap.py");
+    s.execute_checked("camera.exportBlender", json!({"layer": lid.0, "path": output})).unwrap();
+    let d = data(&std::fs::read_to_string(output).unwrap());
+    let indices: Vec<i64> = d["frames"].as_array().unwrap().iter().map(|f| f["sourceFrame"].as_i64().unwrap()).collect();
+    assert_eq!(indices, vec![60, 0, 0], "reverse remap wraps the 6-second video and clamps negative source time, as the media pool does");
+}
+
+#[test]
+fn blender_export_defaults_and_script_escaping() {
+    let (mut s, lid, _) = fixture(false);
+    let output = path("escaped.py");
+    let r = s
+        .execute_checked("camera.exportBlender", json!({"layer": lid.0, "path": output, "includePoints": false, "sensorWidth": 24.0, "unitScale": 0.1}))
+        .unwrap();
+    assert_eq!(r["points"], 0);
+    let script = std::fs::read_to_string(&output).unwrap();
+    let d = data(&script);
+    assert!(d["name"].as_str().unwrap().contains("'\\ — câmera"));
+    assert_eq!(d["frames"][0]["lens"], 22.5);
+    assert_eq!(d["frames"][0]["dof"], false);
+    assert!(r["warnings"].as_array().unwrap().iter().any(|w| w.as_str().unwrap().contains("cannot be recovered")));
+    match std::process::Command::new("python3").args(["-c", "import ast,sys; ast.parse(open(sys.argv[1], encoding='utf-8').read())", &output]).status() {
+        Ok(status) => assert!(status.success(), "generated script must parse even with quoted/Unicode paths"),
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => eprintln!("Python AST oracle skipped: python3 is not installed"),
+        Err(e) => panic!("Python AST oracle failed: {e}"),
+    }
+}
+
+#[test]
+fn blender_export_rejects_invalid_arguments_and_write_failures() {
+    let (mut s, lid, _) = fixture(false);
+    for params in [
+        json!({"sensorWidth": 0}),
+        json!({"sensorWidth": "wide"}),
+        json!({"unitScale": -1}),
+        json!({"startFrame": -1}),
+        json!({"startFrame": 1.5}),
+        json!({"startFrame": 1048574}),
+        json!({"includePoints": "yes"}),
+        json!({"bogus": true}),
+        json!({"path": path("bad.blend")}),
+    ] {
+        let mut p = json!({"layer": lid.0, "path": path("invalid.py")});
+        p.as_object_mut().unwrap().extend(params.as_object().unwrap().clone());
+        assert!(s.execute_checked("camera.exportBlender", p.clone()).is_err(), "must reject {p}");
+    }
+    let blocker = path("blocker");
+    std::fs::write(&blocker, b"not a directory").unwrap();
+    let p = format!("{blocker}/scene.py");
+    assert!(s.execute_checked("camera.exportBlender", json!({"layer": lid.0, "path": p})).unwrap_err().to_string().contains("cannot write"));
+}
+
+#[test]
+fn blender_export_rejects_malformed_solves_without_panicking() {
+    for variant in ["empty", "unsolved", "zero-focal", "bad-ground", "huge-resolution", "mismatched-range"] {
+        let (mut s, lid, uid) = fixture(false);
+        let cid = s.active_comp_id().unwrap();
+        let mut solve = ct::solve(&crate::camera_track::static_params(s.active_comp().unwrap().layer(lid).unwrap().props.find_group(uid).unwrap()))
+            .unwrap()
+            .as_ref()
+            .clone();
+        match variant {
+            "empty" => solve.frames.clear(),
+            "unsolved" => solve.frames[0].solved = false,
+            "zero-focal" => solve.frames[0].focal = 0.0,
+            "bad-ground" => solve.ground = Some(Ground::default()),
+            "huge-resolution" => solve.size[0] = 1e10,
+            _ => {
+                solve.frames.pop();
+            }
+        }
+        s.edit("corrupt solve", None, |p, _| {
+            p.comp_mut(cid).unwrap().layer_mut(lid).unwrap().props.find_group_mut(uid).unwrap().prop_mut(ct::SOLVE).unwrap().value = KV::Str(solve.to_json());
+            Ok(())
+        })
+        .unwrap();
+        s.camera_pending.clear();
+        let result = s.execute_checked("camera.exportBlender", json!({"layer": lid.0, "path": path("corrupt.py")}));
+        assert!(result.is_err(), "must reject {variant}");
+    }
+}
+
+#[test]
+fn blender_export_respects_script_write_permission() {
+    let (mut s, lid, _) = fixture(false);
+    let output = path("script-permissions.py");
+    let params = json!({"layer": lid.0, "path": output});
+    for (from_script, allowed) in [(true, false), (true, true), (false, false), (false, true)] {
+        std::fs::write(&output, b"existing file").unwrap();
+        s.prefs.scripting.allow_scripts_write_files = allowed;
+        let result =
+            if from_script { s.execute_for_script("camera.exportBlender", params.clone()) } else { s.execute_checked("camera.exportBlender", params.clone()) };
+        assert!(!s.running_for_script(), "script origin must be restored after success or error");
+        let contents = std::fs::read_to_string(&output).unwrap();
+        if from_script && !allowed {
+            assert!(result.unwrap_err().to_string().contains("Allow Scripts to Write Files"));
+            assert_eq!(contents, "existing file", "blocked scripts must not replace an existing file");
+        } else {
+            assert_eq!(result.unwrap()["frames"], 3);
+            assert!(contents.contains("def import_scene():"));
+        }
+    }
+}
diff --git a/crates/engine/src/tests/stubs.rs b/crates/engine/src/tests/stubs.rs
index 9735f2c08..087a4ae1a 100644
--- a/crates/engine/src/tests/stubs.rs
+++ b/crates/engine/src/tests/stubs.rs
@@ -585,6 +585,70 @@ fn convert_to_bezier_reads_the_shape_as_it_is_set() {
     assert!((mid(&xs) - 10.0).abs() < 1e-6 && (mid(&ys) - 5.0).abs() < 1e-6, "centred on the position: {:?} {:?}", mid(&xs), mid(&ys));
 }
 
+/// #1896: Convert To Bezier Path reads Per-Corner Roundness, not just the uniform Roundness, so
+/// the editable path is the shape that was on screen.
+#[test]
+fn convert_to_bezier_honours_per_corner_roundness() {
+    let mut s = comp();
+    let l = s.execute("layer.newShape", json!({"kind": "rect", "size": [120, 80]})).unwrap()["layer"].as_u64().unwrap();
+    let (uid, _) = first_shape(&s, l);
+    let uid_of = |s: &Session, id: &str| layer(s, l).props.sub("contents").unwrap().find_group(uid).unwrap().get(id).unwrap().uid;
+    let per_corner = uid_of(&s, "perCorner");
+    let top_left = uid_of(&s, "topLeftRoundness");
+    let bottom_right = uid_of(&s, "bottomRightRoundness");
+    for (u, v) in [(per_corner, json!(true)), (top_left, json!(20.0)), (bottom_right, json!(10.0))] {
+        s.execute("prop.set", json!({"layer": l, "path": format!("@{u}"), "value": v})).unwrap();
+    }
+
+    s.state.selected_props = vec![(LayerId(l), uid)];
+    s.execute("path.convertToBezier", json!({})).unwrap();
+    let (new_uid, now) = first_shape(&s, l);
+    assert_eq!(now, "path");
+    let path = shape_path_of(&s, l, new_uid);
+    let expected = effectcraft_path::from_kurbo(&effectcraft_path::rect_radii([120.0, 80.0], [0.0, 0.0], [20.0, 0.0, 10.0, 0.0])).into_iter().next().unwrap();
+    assert_eq!(path, expected, "the converted path has the per-corner geometry");
+}
+
+/// #1896: Convert To Bezier Path evaluates the shape's expressions, so an expression-driven
+/// Per-Corner checkbox and radius convert to the geometry on screen.
+#[test]
+fn convert_to_bezier_evaluates_corner_expressions() {
+    struct Corners;
+    impl effectcraft_render::ExprHost for Corners {
+        fn eval(
+            &self,
+            _: &effectcraft_render::EvalCtx,
+            _: &effectcraft_project::Layer,
+            prop: &effectcraft_project::Property,
+            value: &KV,
+        ) -> std::result::Result<KV, String> {
+            Ok(match prop.match_id.as_str() {
+                "perCorner" => KV::Bool(true),
+                "topLeftRoundness" => KV::Scalar(20.0),
+                _ => value.clone(),
+            })
+        }
+    }
+
+    let mut s = comp();
+    s.expr = Some(Arc::new(Corners));
+    let l = s.execute("layer.newShape", json!({"kind": "rect", "size": [120, 80]})).unwrap()["layer"].as_u64().unwrap();
+    let (uid, _) = first_shape(&s, l);
+    let uid_of = |s: &Session, id: &str| layer(s, l).props.sub("contents").unwrap().find_group(uid).unwrap().get(id).unwrap().uid;
+    for (id, expression) in [("perCorner", "true"), ("topLeftRoundness", "20")] {
+        let u = uid_of(&s, id);
+        s.execute("prop.setExpression", json!({"layer": l, "path": format!("@{u}"), "expression": expression})).unwrap();
+    }
+
+    s.state.selected_props = vec![(LayerId(l), uid)];
+    s.execute("path.convertToBezier", json!({})).unwrap();
+    let (new_uid, now) = first_shape(&s, l);
+    assert_eq!(now, "path");
+    let path = shape_path_of(&s, l, new_uid);
+    let expected = effectcraft_path::from_kurbo(&effectcraft_path::rect_radii([120.0, 80.0], [0.0, 0.0], [20.0, 0.0, 0.0, 0.0])).into_iter().next().unwrap();
+    assert_eq!(path, expected, "the expression-evaluated corner is converted");
+}
+
 /// #2201: a viewer drag on the free-transform box sends one `path.freeTransform` per frame with a
 /// shared merge key; one undo must revert the whole drag, not the last frame.
 #[test]
diff --git a/crates/engine/tests/blender_scene_oracle.py b/crates/engine/tests/blender_scene_oracle.py
new file mode 100644
index 000000000..3d1cbeda7
--- /dev/null
+++ b/crates/engine/tests/blender_scene_oracle.py
@@ -0,0 +1,61 @@
+"""Public-API oracle for scripts generated by src/tests/blender.rs; no Blender source dependency."""
+import json
+import math
+import runpy
+import sys
+
+import bpy
+from bpy_extras.object_utils import world_to_camera_view
+from mathutils import Quaternion, Vector
+
+path = sys.argv[sys.argv.index("--") + 1]
+before = set(bpy.data.scenes)
+exported = runpy.run_path(path, run_name="__main__")
+scene = exported["EFFECTCRAFT_SCENE"]
+data = exported["DATA"]
+assert before.issubset(set(bpy.data.scenes)), "existing scenes were removed"
+assert scene not in before
+assert scene.frame_start == 101 and scene.frame_end == 103
+assert abs(scene.render.fps / scene.render.fps_base - 30000 / 1001) < 1e-4
+assert (scene.render.resolution_x, scene.render.resolution_y) == (640, 360)
+camera = scene.camera
+assert camera.animation_data.action is not None
+assert camera.data.animation_data.action is not None
+assert camera.data.sensor_fit == 'HORIZONTAL'
+metadata = json.loads(bpy.data.texts[scene["effectcraft_metadata_text"]].as_string())
+assert metadata["solve"]["averageError"] == 0.12
+cloud = scene.objects["Solved Track Points"]
+assert len(cloud.data.vertices) == 2
+assert cloud.hide_render
+assert cloud.data.attributes["track_id"].data[0].value == 7
+assert any(obj.name.startswith("Solved Ground Plane") for obj in scene.objects)
+
+for i, sample in enumerate(data["frames"]):
+    scene.frame_set(sample["frame"])
+    bpy.context.view_layer.update()
+    assert abs(camera.data.lens - sample["lens"]) < 1e-5
+    assert abs(camera.data.dof.focus_distance - sample["focus"]) < 1e-5
+    assert abs(camera.data.dof.aperture_fstop - sample["fstop"]) < 1e-5
+    assert camera.data.dof.use_dof
+    assert (camera.location - Vector(sample["location"])).length < 1e-5
+    raw = data["solve"]["frames"][i]
+    rot = Vector(raw["rot"])
+    rotation = Quaternion(rot.normalized(), rot.length).to_matrix() if rot.length else Quaternion().to_matrix()
+    for vertex, point in zip(cloud.data.vertices, data["solve"]["points"]):
+        relative = rotation @ (Vector(point["pos"]) - Vector(raw["center"]))
+        expected = (raw["focal"] * relative.x / relative.z + 320,
+                    raw["focal"] * relative.y / relative.z + 180)
+        projected = world_to_camera_view(scene, camera, vertex.co)
+        actual = (projected.x * 640, (1.0 - projected.y) * 360)
+        assert math.dist(actual, expected) < 0.002, (sample["frame"], actual, expected)
+
+    if "Video not found" not in " ".join(data["warnings"]):
+        background = camera.data.background_images[0]
+        assert background.image.source == 'MOVIE'
+        assert tuple(background.image.size) == (640, 360)
+        user = background.image_user
+        actual_source = sample["frame"] - user.frame_start + user.frame_offset
+        assert actual_source == sample["sourceFrame"], (actual_source, sample["sourceFrame"])
+        assert user.use_auto_refresh
+
+print("EFFECTCRAFT_BLENDER_ORACLE_OK")
diff --git a/crates/export/src/pipeline.rs b/crates/export/src/pipeline.rs
index c639ebad1..8e8c90561 100644
--- a/crates/export/src/pipeline.rs
+++ b/crates/export/src/pipeline.rs
@@ -431,12 +431,13 @@ impl<'a> Cx<'a> {
     fn crop_resize(&self, img: Image) -> Image {
         let om = self.job.output;
         let scale = self.comp().map(|c| self.job.settings.effective_scale(c)).unwrap_or_else(|| self.job.settings.resolution.clamp(0.01, 4.0));
+        // frame_size applies crop itself: use the original frame and the same scale as edges.
+        let (w, h) = om.frame_size(img.width, img.height, scale);
         let (t, l, b, r) = om.crop.edges(img.width, img.height, scale);
         let img = if (t, l, b, r) == (0, 0, 0, 0) { img } else { crop(&img, t, l, b, r) };
         if !om.resize.enabled {
             return img;
         }
-        let (w, h) = om.frame_size(img.width, img.height, 1.0);
         if (w, h) == (img.width, img.height) {
             return img;
         }
@@ -1062,6 +1063,91 @@ mod tests {
         }
     }
 
+    /// Regress the locked-aspect example: cropping 1920x1080 must resize to 1280x1440.
+    #[test]
+    fn crop_resize_applies_margins_once() {
+        use effectcraft_project::render_queue::{Crop, OutputModule, Resize};
+        let output = OutputModule {
+            crop: Crop { enabled: true, left: 480, right: 480, ..Default::default() },
+            resize: Resize { enabled: true, width: 1280, lock_aspect: true, quality: ResizeQuality::Low, ..Default::default() },
+            ..Default::default()
+        };
+        assert_eq!(output.frame_size(1920, 1080, 1.0), (1280, 1440));
+        let img = run_crop_resize(Image::new(1920, 1080), &output, 1.0);
+        assert_eq!((img.width, img.height), (1280, 1440));
+        assert_eq!(img.data.len(), 1280 * 1440);
+    }
+
+    /// Apply output-module geometry to a synthetic frame without rendering or writing files.
+    fn run_crop_resize(img: Image, output: &effectcraft_project::render_queue::OutputModule, scale: f64) -> Image {
+        use effectcraft_project::render_queue::RenderSettings;
+        let project = Project::default();
+        let settings = RenderSettings { resolution: scale, ..Default::default() };
+        let job = Job {
+            project: &project,
+            footage: &effectcraft_render::NoFootage,
+            expr: None,
+            accel: None,
+            comp: effectcraft_project::ItemId(0),
+            settings: &settings,
+            output,
+            path: "unused.png",
+            sink: None,
+            nested_switches: true,
+            options: Default::default(),
+        };
+        Cx::new(&job).crop_resize(img)
+    }
+
+    /// Match predicted dimensions across crop, padding, ROI scale, aspect locks and resize qualities.
+    #[test]
+    fn crop_resize_dimensions_match_the_output_module() {
+        use effectcraft_project::render_queue::{Crop, OutputModule, Resize};
+        let edges = Crop { enabled: true, left: 2, right: 2, ..Default::default() };
+        let padding = Crop { enabled: true, left: -2, bottom: -2, ..Default::default() };
+        let roi = |rect| Crop { enabled: true, use_roi: true, roi: Some(rect), ..Default::default() };
+        for quality in [ResizeQuality::Low, ResizeQuality::High] {
+            let resize = |width| Resize { enabled: true, width, height: 1, lock_aspect: true, quality };
+            for (crop, resize, scale, expected) in [
+                (Crop::default(), Resize::default(), 1.0, (8, 6)),
+                (edges, Resize::default(), 1.0, (4, 6)),
+                (Crop::default(), resize(4), 1.0, (4, 3)),
+                (edges, resize(8), 1.0, (8, 12)),
+                (padding, resize(5), 1.0, (5, 4)),
+                (roi([4.0, 2.0, 8.0, 6.0]), resize(8), 0.5, (8, 6)),
+                (roi([1.0, 0.5, 2.0, 1.5]), resize(8), 2.0, (8, 6)),
+                (edges, Resize { lock_aspect: false, height: 2, ..resize(5) }, 1.0, (5, 2)),
+            ] {
+                let output = OutputModule { crop, resize, ..Default::default() };
+                assert_eq!(output.frame_size(8, 6, scale), expected);
+                let img = run_crop_resize(Image::filled(8, 6, [0.25, 0.0, 0.0, 0.5]), &output, scale);
+                assert_eq!((img.width, img.height), expected, "{crop:?}, {resize:?}, scale {scale}");
+                assert_eq!(img.data.len(), expected.0 as usize * expected.1 as usize);
+            }
+        }
+    }
+
+    /// Exercise zero/empty inputs, collapsed crops and existing caps on extreme single-axis resizes.
+    #[test]
+    fn crop_resize_zero_and_extreme_sizes_stay_bounded() {
+        use effectcraft_project::render_queue::{Crop, OutputModule, Resize};
+        for quality in [ResizeQuality::Low, ResizeQuality::High] {
+            for (size, crop, width, height, expected) in [
+                ((8, 6), Crop::default(), 0, 0, (1, 1)),
+                ((8, 1), Crop::default(), u32::MAX, 1, (30_000, 1)),
+                ((1, 8), Crop::default(), 1, u32::MAX, (1, 30_000)),
+                ((8, 6), Crop { enabled: true, left: 20_000, right: 20_000, ..Default::default() }, 2, 3, (2, 3)),
+                ((0, 0), Crop { enabled: true, left: 1, top: 1, ..Default::default() }, 2, 3, (2, 3)),
+            ] {
+                let output = OutputModule { crop, resize: Resize { enabled: true, width, height, lock_aspect: false, quality }, ..Default::default() };
+                let img = run_crop_resize(Image::new(size.0, size.1), &output, 1.0);
+                assert_eq!((img.width, img.height), expected);
+                assert_eq!(img.data.len(), expected.0 as usize * expected.1 as usize);
+                assert!(img.data.iter().all(|p| *p == [0.0; 4]));
+            }
+        }
+    }
+
     #[test]
     fn crop_and_pad() {
         let mut img = Image::new(4, 3);
diff --git a/crates/export/tests/it/render_settings.rs b/crates/export/tests/it/render_settings.rs
index 465d8e5fe..0fd6d471b 100644
--- a/crates/export/tests/it/render_settings.rs
+++ b/crates/export/tests/it/render_settings.rs
@@ -174,6 +174,31 @@ fn crop_roi_and_resize() {
     assert_eq!((z.width(), z.height()), (32, 24));
 }
 
+/// Resizing to the cropped frame's own dimensions must preserve every decoded PNG pixel.
+/// Compare against crop-only output for padding and scaled ROIs with both resize qualities.
+#[test]
+fn crop_resize_preserves_pixels_when_the_cropped_size_is_requested() {
+    let (p, cid) = project(FrameRate::new(25, 1), |_, _| {});
+    for (crop, scale, expected) in [
+        (Crop { enabled: true, left: 16, right: 16, ..Default::default() }, 1.0, (32, 48)),
+        (Crop { enabled: true, left: -4, top: -2, ..Default::default() }, 1.0, (68, 50)),
+        (Crop { enabled: true, use_roi: true, roi: Some([0.0, 24.0, 32.0, 24.0]), ..Default::default() }, 0.5, (16, 12)),
+        (Crop { enabled: true, use_roi: true, roi: Some([0.0, 24.0, 32.0, 24.0]), ..Default::default() }, 2.0, (64, 48)),
+    ] {
+        let settings = RenderSettings { resolution: scale, ..custom(0.4, 0.44) };
+        let mut output = OutputModule { crop, ..OutputModule::for_format(OutputFormat::PngSequence) };
+        let reference = png(&run(&p, cid, &settings, &output, "/c/reference_[#####].png"), 0);
+        assert_eq!(reference.dimensions(), expected);
+        assert!(reference.pixels().any(|p| p.0[0] > 150), "the reference contains visible content");
+        for quality in [ResizeQuality::Low, ResizeQuality::High] {
+            output.resize = Resize { enabled: true, width: expected.0, height: 1, lock_aspect: true, quality };
+            let actual = png(&run(&p, cid, &settings, &output, "/c/resized_[#####].png"), 0);
+            assert_eq!(actual.dimensions(), expected);
+            assert!(actual == reference, "crop {crop:?}, scale {scale}, quality {quality:?}: pixels changed");
+        }
+    }
+}
+
 #[test]
 fn alpha_only_and_premultiplied() {
     let (p, cid) = project(FrameRate::new(25, 1), |p, comp| {
diff --git a/crates/gpu/src/fx_sim.rs b/crates/gpu/src/fx_sim.rs
index a2d2c24dd..944ca6c07 100644
--- a/crates/gpu/src/fx_sim.rs
+++ b/crates/gpu/src/fx_sim.rs
@@ -253,6 +253,7 @@ fn bubbles(e: &mut Enc, ctx: &EffectCtx, b: GBuf, geo: &effectcraft_effects::Buf
     }
     let mut p = Params::default();
     p.u[1] = [0, (ctx.params.e("reflectionType") == 1) as u32, ctx.params.e("shadingType"), 0];
+    p.f[0] = effectcraft_effects::bubble_sample_bounds(ctx, b.offset, b.scale);
     let img = raster(e, items, 1, false, &b.img, None, p, w, h)?;
     Some(GBuf { img, ..b })
 }
diff --git a/crates/gpu/src/shaders/fx_sim.wgsl b/crates/gpu/src/shaders/fx_sim.wgsl
index 8ef3035fe..0c6023f32 100644
--- a/crates/gpu/src/shaders/fx_sim.wgsl
+++ b/crates/gpu/src/shaders/fx_sim.wgsl
@@ -165,7 +165,8 @@ fn fxm_sprite(at: u32, x: f32, y: f32) -> FxmShade {
     return FxmShade(true, vec4<f32>(rgb * a, a));
 }
 
-// CC Bubbles' bubble (sim::bubbles). u[1].y = metal, u[1].z = shading type.
+// CC Bubbles' bubble (sim::bubbles). u[1].y = metal, u[1].z = shading type, f[0] = the layer
+// rectangle's first and last pixel centres (x0, y0, x1, y1), which refraction samples stay within.
 fn fxm_bubble(at: u32, x: f32, y: f32) -> FxmShade {
     let qx = data[at + 1u];
     let qy = data[at + 2u];
@@ -180,7 +181,9 @@ fn fxm_bubble(at: u32, x: f32, y: f32) -> FxmShade {
     }
     let k = select(-0.7, 1.6, P.u[1].y != 0u);
     let nz = sqrt(max(1.0 - d2, 0.0));
-    let s = fxm_unpremul(sample_bilinear_clamped(src, data[at + 4u] + dx * qr * k, data[at + 5u] + dy * qr * k));
+    let sx = min(max(data[at + 4u] + dx * qr * k, P.f[0].x), P.f[0].z);
+    let sy = min(max(data[at + 5u] + dy * qr * k, P.f[0].y), P.f[0].w);
+    let s = fxm_unpremul(sample_bilinear_clamped(src, sx, sy));
     var c = s.xyz;
     if (s.w <= 0.0) {
         c = vec3<f32>(0.6, 0.7, 0.8);
diff --git a/crates/gpu/src/tests/fx_sim.rs b/crates/gpu/src/tests/fx_sim.rs
index dc2510bb3..4f54e07b6 100644
--- a/crates/gpu/src/tests/fx_sim.rs
+++ b/crates/gpu/src/tests/fx_sim.rs
@@ -105,6 +105,34 @@ fn bubbles_drizzle_mercury() {
     case("ec.sim.ccmrmercury", &[("birthRate", n(3.0)), ("blobInfluence", n(60.0)), ("shading/metal", n(80.0)), ("gravity", n(2.0))], 1.5, 0.0);
 }
 
+/// CC Bubbles on a buffer with transparent padding around the layer: both sides clamp the
+/// refraction samples to the layer rectangle, not to the buffer (#2024).
+#[test]
+fn bubbles_on_padded_buffers() {
+    let Some(g) = gpu() else { return };
+    let spec = effectcraft_effects::find("ec.sim.ccbubbles").unwrap();
+    let size = [70.0, 44.0];
+    for reflection in [0, 1] {
+        let mut params =
+            effectcraft_effects::Params { values: spec.params.iter().map(|ps| (ps.id.to_string(), effectcraft_effects::default_value(ps, size))).collect() };
+        for (k, v) in [("bubbleAmount", n(80.0)), ("bubbleSize", n(4.0)), ("reflectionType", e(reflection))] {
+            params.values.insert(k.to_string(), v);
+        }
+        for scale in [1.0, 0.5] {
+            let img = pattern(7, (size[0] * scale) as u32, (size[1] * scale) as u32);
+            let mut buf = effectcraft_effects::Buf { img, offset: [0.0, 0.0], scale };
+            buf.pad(6);
+            let ctx = || effectcraft_effects::EffectCtx { params: &params, time: 0.5, layer_size: size, seed: 11, adjustment: false, env: Default::default() };
+            let cpu = (spec.render)(&ctx(), buf.clone());
+            let out =
+                effectcraft_render::Accelerator::effects(g, &[effectcraft_render::FxStep { spec, ctx: ctx() }], &buf, None).expect("the GPU runs the effect");
+            assert_eq!((out.offset, out.scale), (cpu.offset, cpu.scale), "geometry");
+            let d = diff(&cpu.img, &out.img, 1e-3);
+            assert!(d.over == 0, "reflection {reflection} scale {scale}: {} of {} pixels over 1e-3 (max {}); worst {:?}", d.over, d.total, d.max, d.worst);
+        }
+    }
+}
+
 #[test]
 fn hair_wave_world_foam() {
     case("ec.sim.cchair", &[("density", n(300.0)), ("length", n(10.0))], 0.0, 0.0);
diff --git a/crates/lottie/src/shapes.rs b/crates/lottie/src/shapes.rs
index 990a0f28b..5b9d29970 100644
--- a/crates/lottie/src/shapes.rs
+++ b/crates/lottie/src/shapes.rs
@@ -113,6 +113,9 @@ impl Out<'_, '_> {
     fn f(&self, m: &str) -> f64 {
         self.g.get(m).map(|p| p.value.as_f64()).unwrap_or(0.0)
     }
+    fn flag(&self, m: &str) -> bool {
+        self.g.get(m).map(|p| p.value.as_bool()).unwrap_or(false)
+    }
     fn animated(&self, m: &str) -> bool {
         self.g.get(m).is_some_and(|p| p.is_animated() || p.has_expression())
     }
@@ -232,7 +235,20 @@ pub(crate) fn export_items(ex: &mut Ex, contents: &PropGroup, label: &str) -> Ve
                 dir(&mut o);
                 o.put("s", "size", &anim::arr2);
                 o.put("p", "position", &anim::arr2);
-                o.put("r", "roundness", &anim::num);
+                if o.flag("perCorner") {
+                    let names = ["topLeftRoundness", "topRightRoundness", "bottomRightRoundness", "bottomLeftRoundness"];
+                    let radii = names.map(|m| o.f(m));
+                    // Lottie `rc` has one `r`: four equal static radii export as that value.
+                    // `r` is a property (`{a, k}`) like the uniform branch writes, not a bare number.
+                    if radii.iter().all(|v| (v - radii[0]).abs() < 1e-6) && !names.iter().any(|m| o.animated(m)) && radii[0] >= 0.0 {
+                        o.raw("r", json!({"a": 0, "k": r(radii[0])}));
+                    } else {
+                        o.ex.warn(format!("{}: per-corner roundness has no Lottie rectangle equivalent (roundness 0 exported)", o.label));
+                        o.raw("r", json!({"a": 0, "k": 0}));
+                    }
+                } else {
+                    o.put("r", "roundness", &anim::num);
+                }
             }
             "el" => {
                 dir(&mut o);
@@ -447,6 +463,11 @@ pub(crate) fn import_items(im: &mut Im, ids: &mut Ids, items: &[Json]) -> Vec<Pr
                 set(im, &mut g, "size", j.get("s"), &anim::to_vec2);
                 set(im, &mut g, "position", j.get("p"), &anim::to_vec2);
                 set(im, &mut g, "roundness", j.get("r"), &anim::to_scalar);
+                // Lottie has one roundness: keep the per-corner values in step so ticking the box
+                // on an imported rectangle keeps the shape.
+                for m in ["topLeftRoundness", "topRightRoundness", "bottomRightRoundness", "bottomLeftRoundness"] {
+                    set(im, &mut g, m, j.get("r"), &anim::to_scalar);
+                }
                 g
             }
             "el" => {
diff --git a/crates/lottie/src/tests.rs b/crates/lottie/src/tests.rs
index 203f04c04..83c81e242 100644
--- a/crates/lottie/src/tests.rs
+++ b/crates/lottie/src/tests.rs
@@ -896,3 +896,39 @@ fn muted_keys_are_omitted_from_the_export() {
     assert!((opacity_at(&p, cid, 1.0) - 150.0).abs() < 1e-6);
     assert!((opacity_at(&q, nc, 1.0) - 150.0).abs() < 1e-6);
 }
+
+#[test]
+fn per_corner_roundness_exports_equal_radii_and_warns_when_mixed() {
+    let shape = |radii: [f64; 4], roundness: f64, per_corner: bool| {
+        let (mut p, cid) = setup();
+        let l = shape_layer(&mut p, cid, move |ids| {
+            let mut g = build::shape_rect(ids, [100.0, 50.0], [0.0, 0.0], roundness);
+            g.prop_mut("perCorner").unwrap().value = Value::Bool(per_corner);
+            for (m, v) in
+                [("topLeftRoundness", radii[0]), ("topRightRoundness", radii[1]), ("bottomRightRoundness", radii[2]), ("bottomLeftRoundness", radii[3])]
+            {
+                g.prop_mut(m).unwrap().value = Value::Scalar(v);
+            }
+            let fill = build::shape_fill(ids, [1.0, 0.0, 0.0, 1.0]);
+            vec![build::shape_group(ids, "Rectangle 1", vec![g, fill])]
+        });
+        push(&mut p, cid, l);
+        (p, cid)
+    };
+    let rc = |json: &Json| -> Json { json["layers"][0]["shapes"][0]["it"].as_array().unwrap().iter().find(|i| i["ty"] == "rc").cloned().unwrap() };
+    // Four equal static radii: `rc.r` carries the value, no warning.
+    let (p, cid) = shape([12.0; 4], 5.0, true);
+    let (_, _, warnings, json) = roundtrip(&p, cid, &ExportOptions::default());
+    assert_eq!(rc(&json)["r"], json!({"a": 0, "k": 12.0}));
+    assert!(!warnings.iter().any(|w| w.contains("per-corner")), "{warnings:?}");
+    // Mixed radii: not representable, roundness 0 exported with a warning.
+    let (p, cid) = shape([10.0, 20.0, 10.0, 20.0], 5.0, true);
+    let (_, _, warnings, json) = roundtrip(&p, cid, &ExportOptions::default());
+    assert_eq!(rc(&json)["r"], json!({"a": 0, "k": 0}));
+    assert!(warnings.iter().any(|w| w.contains("per-corner roundness")), "{warnings:?}");
+    // The checkbox off exports the single Roundness and ignores the four values.
+    let (p, cid) = shape([10.0, 20.0, 10.0, 20.0], 5.0, false);
+    let (_, _, warnings, json) = roundtrip(&p, cid, &ExportOptions::default());
+    assert_eq!(rc(&json)["r"]["k"], json!(5.0));
+    assert!(!warnings.iter().any(|w| w.contains("per-corner")), "{warnings:?}");
+}
diff --git a/crates/path/src/lib.rs b/crates/path/src/lib.rs
index 83e2102dc..61fd0e6c3 100644
--- a/crates/path/src/lib.rs
+++ b/crates/path/src/lib.rs
@@ -164,6 +164,52 @@ pub fn rect(size: [f64; 2], pos: [f64; 2], roundness: f64) -> BezPath {
     p
 }
 
+/// Rectangle path centred at `pos` with independent corner radii `[top-left, top-right,
+/// bottom-right, bottom-left]`, clockwise in screen coordinates. Negative and non-finite radii
+/// are 0; radii that would overlap are scaled down as CSS `border-radius` does.
+pub fn rect_radii(size: [f64; 2], pos: [f64; 2], radii: [f64; 4]) -> BezPath {
+    // Start at the end of the top-right arc on the right edge, like `rect`, and walk the corners
+    // clockwise: Trim Paths measures from the first point, so ticking per-corner roundness must
+    // not make a trim jump (#1896).
+    let w = if size[0].is_finite() { size[0].abs() } else { 0.0 };
+    let h = if size[1].is_finite() { size[1].abs() } else { 0.0 };
+    let (x0, y0) = (pos[0] - w / 2.0, pos[1] - h / 2.0);
+    let (x1, y1) = (pos[0] + w / 2.0, pos[1] + h / 2.0);
+    let mut r = radii.map(|v| if v.is_finite() { v.max(0.0) } else { 0.0 });
+    // CSS border-radius: when two radii on an edge overlap, scale every radius by the smallest
+    // edge ratio (a uniform radius then clamps to half the shorter side, as before).
+    let ratio = |a: f64, b: f64, edge: f64| if a + b > edge && a + b > 0.0 { (edge / (a + b)).min(1.0) } else { 1.0 };
+    let f = ratio(r[0], r[1], w).min(ratio(r[3], r[2], w)).min(ratio(r[0], r[3], h)).min(ratio(r[1], r[2], h));
+    if f < 1.0 {
+        for v in &mut r {
+            *v *= f;
+        }
+    }
+    let [tl, tr, br, bl] = r;
+    // Quarter-circle Bezier control distance.
+    const K: f64 = 0.552_284_749_830_793_6;
+    let mut p = BezPath::new();
+    p.move_to((x1, y0 + tr));
+    p.line_to((x1, y1 - br));
+    if br > 0.0 {
+        p.curve_to((x1, y1 - br + K * br), (x1 - br + K * br, y1), (x1 - br, y1));
+    }
+    p.line_to((x0 + bl, y1));
+    if bl > 0.0 {
+        p.curve_to((x0 + bl - K * bl, y1), (x0, y1 - bl + K * bl), (x0, y1 - bl));
+    }
+    p.line_to((x0, y0 + tl));
+    if tl > 0.0 {
+        p.curve_to((x0, y0 + tl - K * tl), (x0 + tl - K * tl, y0), (x0 + tl, y0));
+    }
+    p.line_to((x1 - tr, y0));
+    if tr > 0.0 {
+        p.curve_to((x1 - tr + K * tr, y0), (x1, y0 + tr - K * tr), (x1, y0 + tr));
+    }
+    p.close_path();
+    p
+}
+
 pub fn ellipse(size: [f64; 2], pos: [f64; 2]) -> BezPath {
     to_kurbo(&ShapePath::ellipse(pos, size[0], size[1]))
 }
@@ -419,6 +465,11 @@ mod tests {
         let round = ops::trim(&[rect([400.0, 300.0], [0.0, 0.0], 40.0)], 0.0, 25.0, 0.0);
         let (a, b) = ends(&round[0]);
         assert!(near(a, (200.0, -110.0)) && near(b, (110.0, 150.0)), "{a:?} {b:?}");
+        // Per-corner roundness starts and runs in the same order: ticking the checkbox must not
+        // move a Trim Paths contour.
+        let corners = ops::trim(&[rect_radii([400.0, 300.0], [0.0, 0.0], [40.0; 4])], 0.0, 25.0, 0.0);
+        let (a, b) = ends(&corners[0]);
+        assert!(near(a, (200.0, -110.0)) && near(b, (110.0, 150.0)), "per-corner: {a:?} {b:?}");
         // Start > End: AE draws 30..70 % (plain: from x 80 on the bottom up to y −130 on the left).
         let swapped = ops::trim(&[rect([400.0, 300.0], [0.0, 0.0], 0.0)], 70.0, 30.0, 0.0);
         let (a, b) = ends(&swapped[0]);
@@ -456,6 +507,32 @@ mod tests {
         assert!((area - 200.0).abs() < 1.0, "{area}");
     }
 
+    #[test]
+    fn rect_radii_uniform_matches_a_rounded_rect() {
+        for r in [0.0, 5.0, 25.0, 100.0] {
+            let p = rect_radii([100.0, 50.0], [10.0, 20.0], [r; 4]);
+            let clamped = r.min(25.0);
+            let expect = 100.0 * 50.0 - (4.0 - std::f64::consts::PI) * clamped * clamped;
+            assert!((p.area().abs() - expect).abs() < 1.0, "{r}: {} != {expect}", p.area());
+            assert!((p.area() - rect([100.0, 50.0], [10.0, 20.0], r).area()).abs() < 1e-6);
+        }
+    }
+
+    #[test]
+    fn rect_radii_mixes_corners_and_scales_overlaps() {
+        // Only the top-left and bottom-right corners round.
+        let p = rect_radii([100.0, 50.0], [0.0, 0.0], [10.0, 0.0, 20.0, 0.0]);
+        let expect = 100.0 * 50.0 - (1.0 - std::f64::consts::PI / 4.0) * (10.0 * 10.0 + 20.0 * 20.0);
+        assert!((p.area().abs() - expect).abs() < 1.0, "{}", p.area());
+        // Radii wider than the top edge scale down together, like CSS border-radius.
+        let p = rect_radii([50.0, 100.0], [0.0, 0.0], [40.0, 40.0, 0.0, 0.0]);
+        let scaled = rect_radii([50.0, 100.0], [0.0, 0.0], [25.0, 25.0, 0.0, 0.0]);
+        assert!((p.area() - scaled.area()).abs() < 1e-9);
+        // Negative and non-finite radii are square corners.
+        let p = rect_radii([50.0, 50.0], [0.0, 0.0], [-5.0, f64::NAN, f64::INFINITY, 0.0]);
+        assert!((p.area().abs() - 2500.0).abs() < 1e-9);
+    }
+
     #[test]
     fn stroke_has_area() {
         let r = rect([40.0, 40.0], [50.0, 50.0], 0.0);
diff --git a/crates/project/src/build.rs b/crates/project/src/build.rs
index 3ff61ba7d..1aa8d7c90 100644
--- a/crates/project/src/build.rs
+++ b/crates/project/src/build.rs
@@ -385,11 +385,18 @@ pub fn shape_group(ids: &mut Ids, name: &str, items: Vec<PropGroup>) -> PropGrou
 }
 
 pub fn shape_rect(ids: &mut Ids, size: [f64; 2], position: [f64; 2], roundness: f64) -> PropGroup {
+    // Per-corner radii start from the uniform Roundness, so ticking the box keeps the shape.
+    let r = if roundness.is_finite() { roundness.max(0.0) } else { 0.0 };
     indexed(ids.group("rect", "Rectangle Path 1"))
         .with(ids.prop("direction", "Path Direction", Value::Enum(0)).with_ui(ParamUi::Hidden))
         .with(ids.prop("size", "Size", Value::Vec2(size)).with_ui(ParamUi::Pixels))
         .with(ids.prop("position", "Position", Value::Vec2(position)).with_ui(ParamUi::Point))
         .with(ids.prop("roundness", "Roundness", Value::Scalar(roundness)).with_ui(ParamUi::Pixels))
+        .with(ids.prop("perCorner", "Per-Corner Roundness", Value::Bool(false)).with_ui(ParamUi::Checkbox))
+        .with(ids.prop("topLeftRoundness", "Top Left Roundness", Value::Scalar(r)).with_ui(ParamUi::Pixels))
+        .with(ids.prop("topRightRoundness", "Top Right Roundness", Value::Scalar(r)).with_ui(ParamUi::Pixels))
+        .with(ids.prop("bottomRightRoundness", "Bottom Right Roundness", Value::Scalar(r)).with_ui(ParamUi::Pixels))
+        .with(ids.prop("bottomLeftRoundness", "Bottom Left Roundness", Value::Scalar(r)).with_ui(ParamUi::Pixels))
 }
 
 pub fn shape_ellipse(ids: &mut Ids, size: [f64; 2], position: [f64; 2]) -> PropGroup {
diff --git a/crates/render/src/shapes.rs b/crates/render/src/shapes.rs
index bbc4283ff..2497ea807 100644
--- a/crates/render/src/shapes.rs
+++ b/crates/render/src/shapes.rs
@@ -269,7 +269,20 @@ fn collect_in(ctx: &EvalCtx, layer: &Layer, contents: &PropGroup, arena: &mut Ve
             "rect" => {
                 let size = ctx.v2(layer, g, "size", [100.0; 2]);
                 let pos = ctx.v2(layer, g, "position", [0.0; 2]);
-                let p = effectcraft_path::rect(size, pos, ctx.f(layer, g, "roundness", 0.0));
+                let p = if ctx.b(layer, g, "perCorner") {
+                    effectcraft_path::rect_radii(
+                        size,
+                        pos,
+                        [
+                            ctx.f(layer, g, "topLeftRoundness", 0.0),
+                            ctx.f(layer, g, "topRightRoundness", 0.0),
+                            ctx.f(layer, g, "bottomRightRoundness", 0.0),
+                            ctx.f(layer, g, "bottomLeftRoundness", 0.0),
+                        ],
+                    )
+                } else {
+                    effectcraft_path::rect(size, pos, ctx.f(layer, g, "roundness", 0.0))
+                };
                 push_shape(ctx, layer, g, p, arena, &mut live);
             }
             "ellipse" => {
diff --git a/crates/render/src/shapes/tests.rs b/crates/render/src/shapes/tests.rs
index e0c9086a7..ba7028a25 100644
--- a/crates/render/src/shapes/tests.rs
+++ b/crates/render/src/shapes/tests.rs
@@ -715,3 +715,33 @@ fn miter_corner_still_fits_its_buffer() {
     let b = shape_buf(&p, cid);
     assert!(b.img.height as f64 >= 50.0 + 20.0 * 4.0 * 0.5, "{}", b.img.height);
 }
+
+#[test]
+fn rect_per_corner_roundness_rounds_the_named_corners() {
+    let render = |per_corner: bool, radii: [f64; 4], roundness: f64| {
+        let (p, cid) = shape_comp_sized(200, 100, move |ids| {
+            let mut g = build::shape_rect(ids, [100.0, 100.0], [0.0, 0.0], roundness);
+            g.prop_mut("perCorner").unwrap().value = Value::Bool(per_corner);
+            for (m, v) in
+                [("topLeftRoundness", radii[0]), ("topRightRoundness", radii[1]), ("bottomRightRoundness", radii[2]), ("bottomLeftRoundness", radii[3])]
+            {
+                g.prop_mut(m).unwrap().value = Value::Scalar(v);
+            }
+            vec![g, build::shape_fill(ids, RED)]
+        });
+        frame(&p, cid)
+    };
+    // Only the top-left corner rounds: its corner pixels fade, the other three stay filled.
+    let img = render(true, [30.0, 0.0, 0.0, 0.0], 0.0);
+    assert!(alpha(&img, 52, 2) < 0.1, "top-left rounds: {}", alpha(&img, 52, 2));
+    for (x, y) in [(148, 2), (148, 98), (52, 98)] {
+        assert!(alpha(&img, x, y) > 0.9, "({x},{y}) stays square: {}", alpha(&img, x, y));
+    }
+    // The checkbox off ignores the four values (the single Roundness still rules).
+    let off = render(false, [30.0; 4], 0.0);
+    assert!((coverage(&off) - 100.0 * 100.0).abs() < 20.0, "{}", coverage(&off));
+    // Four equal per-corner radii render like the same Roundness.
+    let per = render(true, [25.0; 4], 0.0);
+    let uni = render(false, [0.0; 4], 25.0);
+    assert!((coverage(&per) - coverage(&uni)).abs() < 5.0, "{} vs {}", coverage(&per), coverage(&uni));
+}
diff --git a/crates/script/src/scriptui.js b/crates/script/src/scriptui.js
index 178bd8be1..ddfbc1f3e 100644
--- a/crates/script/src/scriptui.js
+++ b/crates/script/src/scriptui.js
@@ -912,6 +912,18 @@ function __uiDispatch(winId, id, kind, valueJson) {
     w.close(v === null ? 2 : v);
     return;
   }
+  // The host gave the window a new size (a docked panel's dock): take it, lay out, tell the script.
+  if (kind === "resize") {
+    var nw = Number(v && v[0]), nh = Number(v && v[1]);
+    var b = w.__ub || w.__lb;
+    if (nw > 0 && nh > 0 && (b[2] - b[0] !== nw || b[3] - b[1] !== nh)) {
+      w.__ub = [b[0], b[1], b[0] + nw, b[1] + nh];
+      __uiLayout(w);
+      w.__fire("onResizing");
+      w.__fire("onResize");
+    }
+    return;
+  }
   var c = __uiFind(w, id);
   if (!c || c.enabled === false) return;
   var radio = function () {
diff --git a/crates/ui-egui/src/i18n/ui.rs b/crates/ui-egui/src/i18n/ui.rs
index 1da662aad..c137204e6 100644
--- a/crates/ui-egui/src/i18n/ui.rs
+++ b/crates/ui-egui/src/i18n/ui.rs
@@ -3962,6 +3962,7 @@ const UKRAINIAN: &[(&str, &str)] = &[
 
 // Brazilian Portuguese.
 const PORTUGUESE: &[(&str, &str)] = &[
+    ("Export Scene to Blender...", "Exportar cena para o Blender..."),
     ("   OK   ", "   OK   "),
     ("  Delete  ", "  Excluir  "),
     (" Open Auto-Save ", " Abrir salvamento automático "),
diff --git a/crates/ui-egui/src/menus/frontend.rs b/crates/ui-egui/src/menus/frontend.rs
index 54938f276..1bd11dabe 100644
--- a/crates/ui-egui/src/menus/frontend.rs
+++ b/crates/ui-egui/src/menus/frontend.rs
@@ -562,6 +562,7 @@ pub(super) fn file_dialog(app: &mut EffectcraftApp, id: &str, params: &Value) ->
         "anim.applyPreset" => ("path", Ask::Open(&["ecpreset", "json"])),
         "view.exportGuides" => ("path", Ask::Save("Guides.json")),
         "view.importGuides" => ("path", Ask::Open(&["json"])),
+        "camera.exportBlender" => ("path", Ask::Save("Tracked Scene.py")),
         "file.exportLottie" => ("path", Ask::Save("Animation.json")),
         "file.importLottie" => ("path", Ask::Open(&["json", "lottie"])),
         "file.importProject" => ("path", Ask::Open(&["ecproj", "ecprojx"])),
diff --git a/crates/ui-egui/src/panels/camera_tracker_ui.rs b/crates/ui-egui/src/panels/camera_tracker_ui.rs
index 3dc0be8d2..80932f490 100644
--- a/crates/ui-egui/src/panels/camera_tracker_ui.rs
+++ b/crates/ui-egui/src/panels/camera_tracker_ui.rs
@@ -430,6 +430,11 @@ pub fn editor(
             actions.push(("camera.create".into(), me.clone()));
         }
         app.auto.add(&format!("effectControls.cameraTracker.{}.createCamera", g.uid), b3, "Create Camera");
+        let export = Rect::from_min_size(pos2(r.min.x + 24.0, r.min.y + 70.0), vec2(218.0, 22.0));
+        if widgets::text_button(ui, export, tr("Export Scene to Blender..."), false, &t, egui::Id::unique(("ct-blender", g.uid))).clicked() && !busy {
+            actions.push(("camera.exportBlender".into(), me.clone()));
+        }
+        app.auto.add(&format!("effectControls.cameraTracker.{}.exportBlender", g.uid), export, "Export Scene to Blender...");
     }
     let status = match app.session.camera_progress() {
         Some(pr) if running => pr.banner(),
@@ -457,4 +462,4 @@ pub fn editor(
 }
 
 /// Height of [`editor`].
-pub const EDITOR_HEIGHT: f32 = 68.0;
+pub const EDITOR_HEIGHT: f32 = 100.0;
diff --git a/crates/ui-egui/src/panels/scriptui_view.rs b/crates/ui-egui/src/panels/scriptui_view.rs
index 14460ed28..753b2884e 100644
--- a/crates/ui-egui/src/panels/scriptui_view.rs
+++ b/crates/ui-egui/src/panels/scriptui_view.rs
@@ -26,6 +26,8 @@ enum Act {
     Close(u32),
     /// A mouse event (`scriptui.mouse` parameters without window and widget).
     Mouse(u32, u32, Value),
+    /// A docked panel's new size (`scriptui.resize`).
+    Resize(u32, [f32; 2]),
 }
 
 fn rect_of(origin: egui::Pos2, b: [f64; 4]) -> Rect {
@@ -500,6 +502,7 @@ fn perform(app: &mut EffectcraftApp, ctx: &egui::Context, acts: Vec<Act>) {
             Act::Set(w, id, v) => ("scriptui.set", json!({"window": w, "widget": id, "value": v})),
             Act::Changing(w, id, v) => ("scriptui.set", json!({"window": w, "widget": id, "value": v, "changing": true})),
             Act::Close(w) => ("scriptui.close", json!({"window": w})),
+            Act::Resize(w, [x, y]) => ("scriptui.resize", json!({"window": w, "size": [x, y]})),
             Act::Mouse(w, id, mut v) => {
                 if let Some(o) = v.as_object_mut() {
                     o.insert("window".into(), json!(w));
@@ -582,6 +585,14 @@ pub fn panel(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect, id: u32) {
     // A modal script dialog blocks the panels too.
     let modal = app.session.script_ui.windows.iter().any(|w| w.modal);
     let mut acts = vec![];
+    // The script learns its dock's size when it changes (#2585), as After Effects tells a
+    // docked panel: its window takes the size and onResize runs.
+    let dock = [rect.width().round(), rect.height().round()];
+    let told = egui::Id::unique(("scriptui-dock-size", id));
+    if ui.data(|d| d.get_temp::<[f32; 2]>(told)) != Some(dock) && dock[0] >= 1.0 && dock[1] >= 1.0 {
+        ui.data_mut(|d| d.insert_temp(told, dock));
+        acts.push(Act::Resize(id, dock));
+    }
     let content = rect;
     egui::ScrollArea::both().id_salt(("scriptui-panel", id)).max_width(content.width()).max_height(content.height()).show(ui, |ui| {
         let (r, _) = ui.allocate_exact_size(vec2(w.root.bounds[2] as f32, w.root.bounds[3] as f32), Sense::hover());
diff --git a/crates/ui-egui/src/panels/settings.rs b/crates/ui-egui/src/panels/settings.rs
index f4dd89bfc..562a90132 100644
--- a/crates/ui-egui/src/panels/settings.rs
+++ b/crates/ui-egui/src/panels/settings.rs
@@ -117,15 +117,20 @@ fn page_ui(app: &mut EffectcraftApp, ui: &mut egui::Ui, page: &Page, cur: &Value
                             ui.add_sized(vec2(label_w, 18.0), egui::Label::new(format!("{}:", tr(label))).truncate());
                             let r = match kind {
                                 Kind::Int(lo, hi, unit) => {
-                                    let mut x = v.as_i64().unwrap_or(0);
-                                    // A typed number applies once entered: typing 85 into UI Scale
-                                    // doesn't resize the interface to 75 % at its first digit.
+                                    // A dragged value applies on release, and a typed one once
+                                    // entered: UI Scale doesn't resize the interface under the
+                                    // pointer mid-drag (#2582) or at a typed number's first digit.
+                                    let held = egui::Id::unique(("settings-drag", key));
+                                    let mut x = ui.data(|d| d.get_temp::<i64>(held)).unwrap_or_else(|| v.as_i64().unwrap_or(0));
                                     let drag = egui::DragValue::new(&mut x).range(lo..=hi).speed(0.25).update_while_editing(false);
                                     let r = ui.add(crate::widgets::drag_value(drag));
                                     if !unit.is_empty() {
                                         ui.label(RichText::new(tr(unit)).color(t.text_dim));
                                     }
-                                    if r.changed() {
+                                    if r.dragged() {
+                                        ui.data_mut(|d| d.insert_temp(held, x));
+                                    } else if r.changed() || r.drag_stopped() {
+                                        ui.data_mut(|d| d.remove::<i64>(held));
                                         acts.push(Act::Set(key.into(), json!(x)));
                                     }
                                     r
diff --git a/crates/ui-egui/src/panels/timeline.rs b/crates/ui-egui/src/panels/timeline.rs
index 641a549a6..9f308e4be 100644
--- a/crates/ui-egui/src/panels/timeline.rs
+++ b/crates/ui-egui/src/panels/timeline.rs
@@ -3591,7 +3591,15 @@ fn group_row_click(app: &mut EffectcraftApp, ui: &mut egui::Ui, g: &mut Rw, rc:
     }
     app.auto.add(&format!("timeline.group.{uid}.name"), gr_rect, name);
     if gr.clicked() && uid & (WAVE_BIT | GEOM_BIT) == 0 {
-        actions.push(("prop.select".into(), json!({"layer": layer.id.0, "prop": uid, "selectKeys": false})));
+        // Shift or Cmd/Ctrl adds the group to the selection, or takes a selected one out, as
+        // property rows and Effect Controls headers do (#2552: several effects and styles for
+        // one animation preset).
+        let add = ui.input(|i| i.modifiers.shift || i.modifiers.command);
+        if add && app.session.state.selected_props.contains(&(layer.id, *uid)) {
+            actions.push(("prop.deselect".into(), json!({"layer": layer.id.0, "prop": uid})));
+        } else {
+            actions.push(("prop.select".into(), json!({"layer": layer.id.0, "prop": uid, "selectKeys": false, "add": add})));
+        }
     }
     if gr.double_clicked() {
         if fx.is_some() {
diff --git a/crates/ui-egui/src/panels/timeline/tests.rs b/crates/ui-egui/src/panels/timeline/tests.rs
index 12259abf7..9a5c89f7d 100644
--- a/crates/ui-egui/src/panels/timeline/tests.rs
+++ b/crates/ui-egui/src/panels/timeline/tests.rs
@@ -195,6 +195,11 @@ fn shape_group_inner_contents_is_elided() {
             "        Size",
             "        Position",
             "        Roundness",
+            "        Per-Corner Roundness",
+            "        Top Left Roundness",
+            "        Top Right Roundness",
+            "        Bottom Right Roundness",
+            "        Bottom Left Roundness",
             "      >Fill 1",
             "        Composite",
             "        Fill Rule",
diff --git a/crates/ui-egui/src/panels/viewer_overlays.rs b/crates/ui-egui/src/panels/viewer_overlays.rs
index 05884abce..ab6d3d561 100644
--- a/crates/ui-egui/src/panels/viewer_overlays.rs
+++ b/crates/ui-egui/src/panels/viewer_overlays.rs
@@ -132,17 +132,52 @@ pub(crate) fn path_of(ectx: &EvalCtx, layer: LayerId, uid: u64) -> Option<PathIn
 /// The path on screen: `sp` through `m` and the viewer map, flattened, with the closing point
 /// repeated for a closed path.
 pub(crate) fn flatten(sp: &ShapePath, m: &Mat3, map: &ViewerMap) -> Vec<Pos2> {
-    let k = effectcraft_engine::render::kurbo_path(sp);
+    let mut k = effectcraft_engine::render::kurbo_path(sp);
+    // A path-space tolerance becomes visible corners when the viewer or a layer/group is
+    // magnified. Flatten affine paths in screen space so the error stays below half a point.
+    // Projective transforms must still map the flattened points: projecting Bezier control
+    // points would change the curve rather than just its tessellation.
+    let screen_space = m.is_affine();
+    if screen_space {
+        let z = f64::from(map.zoom);
+        k.apply_affine(kurbo::Affine::new([
+            m.0[0][0] * z,
+            m.0[1][0] * z,
+            m.0[0][1] * z,
+            m.0[1][1] * z,
+            m.0[0][2] * z + f64::from(map.origin.x),
+            m.0[1][2] * z + f64::from(map.origin.y),
+        ]));
+    }
+    if !k.is_finite() {
+        return Vec::new();
+    }
+    let bounds = k.control_box();
+    if [bounds.x0, bounds.y0, bounds.x1, bounds.y1].iter().any(|v| v.abs() > f64::from(f32::MAX)) {
+        return Vec::new();
+    }
+    // Bound subdivision work even for extreme finite scales from a malformed project. For
+    // ordinary on-screen paths the tolerance remains half a point.
+    let tolerance = (bounds.width().max(bounds.height()) / 1_000_000.0).max(0.5);
     let mut pts: Vec<Pos2> = vec![];
-    kurbo::flatten(k.iter(), 0.5, |el| match el {
+    kurbo::flatten(k.iter(), tolerance, |el| match el {
         kurbo::PathEl::MoveTo(q) | kurbo::PathEl::LineTo(q) => {
-            let c = m.apply(gv2(q.x, q.y));
-            pts.push(map.to_screen([c.x, c.y]));
+            let p = if screen_space {
+                egui::pos2(q.x as f32, q.y as f32)
+            } else {
+                let c = m.apply(gv2(q.x, q.y));
+                map.to_screen([c.x, c.y])
+            };
+            if p.is_finite() {
+                pts.push(p);
+            }
         }
         _ => {}
     });
-    if sp.closed && !pts.is_empty() {
-        pts.push(pts[0]);
+    if sp.closed
+        && let Some(first) = pts.first().copied()
+    {
+        pts.push(first);
     }
     pts
 }
@@ -685,6 +720,111 @@ mod tests {
         PathInfo { layer: LayerId(3), uid: 7, m: Mat3::IDENTITY, sp, is_mask: true, feather: Vec::new() }
     }
 
+    fn circle() -> ShapePath {
+        let r = 38.0;
+        let h = r * 0.552_284_749_830_793_6;
+        ShapePath {
+            vertices: vec![[0.0, -r], [r, 0.0], [0.0, r], [-r, 0.0]],
+            in_tangents: vec![[-h, 0.0], [0.0, -h], [h, 0.0], [0.0, h]],
+            out_tangents: vec![[h, 0.0], [0.0, h], [-h, 0.0], [0.0, -h]],
+            closed: true,
+            feather: Vec::new(),
+        }
+    }
+
+    /// Measure the actual screen-space error against dense samples of the original cubics,
+    /// independently of the tessellator's chosen subdivisions.
+    fn screen_error(sp: &ShapePath, m: &Mat3, map: &ViewerMap, points: &[Pos2]) -> f32 {
+        let mut worst = 0.0_f32;
+        for i in 0..sp.vertices.len() {
+            let Some(c) = segment(sp, i) else { continue };
+            for step in 0..=1024 {
+                let q = cubic(c[0], c[1], c[2], c[3], f64::from(step) / 1024.0);
+                let q = m.apply(gv2(q[0], q[1]));
+                let p = map.to_screen([q.x, q.y]);
+                let distance = points
+                    .windows(2)
+                    .map(|pair| {
+                        let a = pair[0];
+                        let v = pair[1] - a;
+                        let t = if v.length_sq() > 0.0 { ((p - a).dot(v) / v.length_sq()).clamp(0.0, 1.0) } else { 0.0 };
+                        p.distance(a + v * t)
+                    })
+                    .fold(f32::INFINITY, f32::min);
+                worst = worst.max(distance);
+            }
+        }
+        worst
+    }
+
+    #[test]
+    fn curve_overlay_stays_smooth_at_viewer_magnifications() {
+        let sp = circle();
+        let mut counts = Vec::new();
+        for zoom in [0.5, 1.0, 5.0] {
+            let map = ViewerMap { origin: egui::pos2(121.25, 210.5), zoom, comp: [640.0, 400.0], area: Rect::EVERYTHING };
+            let points = flatten(&sp, &Mat3::IDENTITY, &map);
+            let error = screen_error(&sp, &Mat3::IDENTITY, &map, &points);
+            assert!(error <= 0.51, "{zoom}x: {error} screen points from the curve");
+            assert_eq!(points.first(), points.last(), "closed paths keep their closing edge");
+            for v in &sp.vertices {
+                let anchor = map.to_screen(*v);
+                assert!(points.iter().any(|p| p.distance(anchor) < 0.001), "original vertex missing at {zoom}x");
+            }
+            counts.push(points.len());
+        }
+        assert!(counts[0] < counts[1] && counts[1] < counts[2], "tessellation follows visible curve size: {counts:?}");
+    }
+
+    #[test]
+    fn curve_overlay_accounts_for_nonuniform_layer_and_group_transforms() {
+        let sp = circle();
+        let layer = Mat3::translate(gv2(70.0, 50.0)) * Mat3::rotate_deg(27.0) * Mat3::scale(gv2(3.2, 0.8));
+        let group = Mat3::rotate_deg(-19.0) * Mat3::skew_deg(25.0, 11.0) * Mat3::scale(gv2(0.7, 2.5));
+        let m = layer * group;
+        for zoom in [0.5, 1.0, 5.0] {
+            let map = ViewerMap { origin: egui::pos2(121.25, 210.5), zoom, comp: [640.0, 400.0], area: Rect::EVERYTHING };
+            let points = flatten(&sp, &m, &map);
+            let error = screen_error(&sp, &m, &map, &points);
+            assert!(error <= 0.51, "{zoom}x transformed path: {error} screen points from the curve");
+        }
+    }
+
+    #[test]
+    fn open_overlay_preserves_its_transformed_endpoints() {
+        let sp = info(vec![[10.0, 20.0], [50.0, 60.0]], false).sp;
+        let m = Mat3::translate(gv2(70.0, 50.0)) * Mat3::rotate_deg(27.0) * Mat3::scale(gv2(3.2, 0.8));
+        let map = ViewerMap { origin: egui::pos2(121.25, 210.5), zoom: 5.0, comp: [640.0, 400.0], area: Rect::EVERYTHING };
+        let points = flatten(&sp, &m, &map);
+        assert_ne!(points.first(), points.last(), "an open path must not gain a closing edge");
+        for (point, vertex) in [points.first(), points.last()].into_iter().zip([sp.vertices.first(), sp.vertices.last()]) {
+            let q = m.apply(gv2(vertex.unwrap()[0], vertex.unwrap()[1]));
+            assert!(point.unwrap().distance(map.to_screen([q.x, q.y])) < 0.001);
+        }
+    }
+
+    #[test]
+    fn invalid_overlay_coordinates_are_not_tessellated() {
+        let sp = circle();
+        for zoom in [f32::NAN, f32::INFINITY] {
+            let map = ViewerMap { origin: Pos2::ZERO, zoom, comp: [640.0, 400.0], area: Rect::EVERYTHING };
+            assert!(flatten(&sp, &Mat3::IDENTITY, &map).is_empty());
+        }
+        let map = ViewerMap { origin: Pos2::ZERO, zoom: 5.0, comp: [640.0, 400.0], area: Rect::EVERYTHING };
+        assert!(flatten(&sp, &Mat3::scale(gv2(f64::INFINITY, 1.0)), &map).is_empty());
+    }
+
+    #[test]
+    fn extreme_finite_overlay_scales_keep_subdivision_bounded() {
+        let map = ViewerMap { origin: Pos2::ZERO, zoom: 5.0, comp: [640.0, 400.0], area: Rect::EVERYTHING };
+        let sp = circle();
+        let points = flatten(&sp, &Mat3::scale(gv2(1e12, 1e12)), &map);
+        assert!(!points.is_empty());
+        assert!(points.len() < 10_000, "extreme scales must not allocate millions of vertices");
+        assert!(points.iter().all(|p| p.is_finite()));
+        assert!(flatten(&sp, &Mat3::scale(gv2(1e300, 1e300)), &map).is_empty());
+    }
+
     /// #912: clicking the last vertex of an open path with the Pen resumes that path.
     #[test]
     fn pen_resumes_an_open_path_at_its_last_vertex() {
diff --git a/crates/ui-egui/tests/it/ui_camera_tracker.rs b/crates/ui-egui/tests/it/ui_camera_tracker.rs
index f7d349342..8c4be61a7 100644
--- a/crates/ui-egui/tests/it/ui_camera_tracker.rs
+++ b/crates/ui-egui/tests/it/ui_camera_tracker.rs
@@ -16,8 +16,9 @@ const H: f64 = 360.0;
 
 fn app() -> (EffectcraftApp, u64, u64) {
     let mut s = Session::default();
-    s.execute("comp.new", json!({"name": "Shot", "width": W, "height": H, "duration": 2})).unwrap();
-    let plate = s.execute("layer.newSolid", json!({"name": "Plate", "color": "#406080"})).unwrap()["layer"].as_u64().unwrap();
+    s.execute("comp.new", json!({"name": "Shot", "width": W as u32, "height": H as u32, "duration": 2, "frameRate": 30})).unwrap();
+    let plate =
+        s.execute("layer.newSolid", json!({"name": "Plate", "color": "#406080", "width": W as u32, "height": H as u32})).unwrap()["layer"].as_u64().unwrap();
     let r = s.execute("effect.apply", json!({"effect": ct::ID, "layers": [plate]})).unwrap();
     let uid = r["effects"][0].as_u64().unwrap();
     // A synthetic solve: a static camera (focal 600) looking at a 6 × 4 grid of points on z = 1.
@@ -135,7 +136,11 @@ fn viewer_points_selection_and_effect_controls() {
     h.state_mut().show_panel(PanelKind::EffectControls);
     h.run_steps(4);
     let all = ids(&h);
-    for want in [format!("effectControls.cameraTracker.{uid}.analyze"), format!("effectControls.cameraTracker.{uid}.createCamera")] {
+    for want in [
+        format!("effectControls.cameraTracker.{uid}.analyze"),
+        format!("effectControls.cameraTracker.{uid}.createCamera"),
+        format!("effectControls.cameraTracker.{uid}.exportBlender"),
+    ] {
         assert!(all.contains(&want), "missing {want}");
     }
     // Tracker panel: Track Camera is available for the selected layer.
@@ -145,6 +150,56 @@ fn viewer_points_selection_and_effect_controls() {
     assert!(h.state().session.is_enabled("track.camera"));
 }
 
+#[test]
+fn blender_export_button_opens_python_dialog_and_writes_scene() {
+    use effectcraft_engine::project::{Footage, FootageKind, ItemKind, LayerId, LayerSource};
+    let (mut a, plate, uid) = app();
+    let cid = a.session.active_comp_id().unwrap();
+    a.session
+        .edit("video fixture", None, |p, _| {
+            let item = p.add_item(
+                "Video",
+                Default::default(),
+                None,
+                ItemKind::Footage(Footage {
+                    path: "/tmp/effectcraft-ui-synthetic.mp4".into(),
+                    kind: FootageKind::Video,
+                    width: W as u32,
+                    height: H as u32,
+                    has_video: true,
+                    duration: effectcraft_engine::time::Tick::from_seconds_f64(2.0),
+                    ..Default::default()
+                }),
+            );
+            p.comp_mut(cid).unwrap().layer_mut(LayerId(plate)).unwrap().source = LayerSource::Footage { item };
+            Ok(())
+        })
+        .unwrap();
+    a.session.camera_pending.clear();
+    let output = std::env::temp_dir().join(format!("effectcraft-ui-blender-{}.py", std::process::id()));
+    let selected_path = output.clone();
+    a.hooks.pick_save_file = Some(Box::new(move |name, ext| {
+        assert!(name.ends_with(".py"));
+        assert_eq!(ext, "py");
+        Some(selected_path.to_string_lossy().into_owned())
+    }));
+    let shot = std::env::var("EFFECTCRAFT_BLENDER_UI_SNAPSHOT").ok();
+    let builder = Harness::builder().with_size(egui::vec2(1600.0, 1000.0));
+    let builder = if shot.is_some() { builder.wgpu() } else { builder };
+    let mut h = builder.build_eframe(|_| a);
+    h.state_mut().show_panel(PanelKind::EffectControls);
+    h.run_steps(5);
+    let button = rect(&h, &format!("effectControls.cameraTracker.{uid}.exportBlender"));
+    if let Some(path) = shot {
+        h.render().expect("render export button").save(path).unwrap();
+    }
+    click(&mut h, button.center(), Default::default());
+    assert!(output.exists(), "UI export failed: {}", h.state().ui.status);
+    let script = std::fs::read_to_string(output).expect("clicking the export button saves a Python scene");
+    assert!(script.contains("def import_scene():"));
+    assert_eq!(h.state().session.active_comp().unwrap().layers.len(), 1, "export does not create a camera in the source project");
+}
+
 /// Drag with `button` from `from` to `to` in steps, then release.
 fn drag_with(h: &mut Harness<'_, EffectcraftApp>, button: egui::PointerButton, from: egui::Pos2, to: egui::Pos2) {
     h.input_mut().events.push(egui::Event::PointerMoved(from));
diff --git a/crates/ui-egui/tests/it/ui_panels.rs b/crates/ui-egui/tests/it/ui_panels.rs
index db9ef7373..6d06c6bf7 100644
--- a/crates/ui-egui/tests/it/ui_panels.rs
+++ b/crates/ui-egui/tests/it/ui_panels.rs
@@ -664,3 +664,33 @@ fn transition_presets_apply_from_effects_and_presets() {
     assert_eq!(fx.name, "Radial Wipe");
     assert_eq!(fx.prop("completion").unwrap().keys.len(), 2);
 }
+
+/// #2582: dragging Settings' UI Scale doesn't resize the interface under the pointer; the value
+/// applies once the button is released.
+#[test]
+fn ui_scale_applies_when_the_drag_ends() {
+    let mut h = harness();
+    open_settings(&mut h);
+    let e = h.state().auto.find("settings.appearance.uiScale").expect("the UI Scale field");
+    let from = pos2(e.rect[0] + e.rect[2] / 2.0, e.rect[1] + e.rect[3] / 2.0);
+    h.input_mut().events.push(Event::PointerMoved(from));
+    h.input_mut().events.push(Event::PointerButton { pos: from, button: egui::PointerButton::Primary, pressed: true, modifiers: Default::default() });
+    h.step();
+    for k in 1..=8 {
+        h.input_mut().events.push(Event::PointerMoved(from + egui::vec2(10.0 * k as f32, 0.0)));
+        h.step();
+        assert_eq!(scale(&h), (100, 1.0), "nothing applies mid-drag");
+    }
+    h.input_mut().events.push(Event::PointerButton {
+        pos: from + egui::vec2(80.0, 0.0),
+        button: egui::PointerButton::Primary,
+        pressed: false,
+        modifiers: Default::default(),
+    });
+    h.run_steps(4);
+    let (pct, zoom) = scale(&h);
+    assert!(pct > 100 && (zoom - pct as f32 / 100.0).abs() < 1e-6, "applied on release: {pct} {zoom}");
+    click(&mut h, "settings.cancel");
+    h.run_steps(2);
+    assert_eq!(scale(&h), (100, 1.0));
+}
diff --git a/crates/ui-egui/tests/it/ui_scriptui.rs b/crates/ui-egui/tests/it/ui_scriptui.rs
index 09986f6d1..0a924bb65 100644
--- a/crates/ui-egui/tests/it/ui_scriptui.rs
+++ b/crates/ui-egui/tests/it/ui_scriptui.rs
@@ -341,6 +341,38 @@ fn a_drag_keeps_its_control_past_the_window_edge() {
     h.state_mut().session.execute("scriptui.close", json!({})).unwrap();
 }
 
+/// #2585: a window the host resizes takes the size, lays out again and runs onResize; a docked
+/// ScriptUI panel gets its dock's size that way.
+#[test]
+fn script_windows_learn_the_size_they_are_given() {
+    let mut h = harness();
+    let code = r#"
+      var w = new Window("palette", "Sized");
+      var log = w.add("statictext", undefined, "", { name: "log" });
+      log.preferredSize = [200, 20];
+      w.onResize = function () { log.text = "resized " + w.size.width + "x" + w.size.height; };
+      w.show();
+    "#;
+    let r = h.state_mut().session.execute("script.run", json!({"code": code, "name": "sized.jsx"})).unwrap();
+    assert_eq!(r["ok"], true, "{r}");
+    h.run_steps(2);
+    h.state_mut().session.execute("scriptui.resize", json!({"window": "Sized", "size": [300, 180]})).unwrap();
+    let win = h.state().session.script_ui.windows[0].clone();
+    assert_eq!(win.root.lookup(&json!("log")).unwrap().text, "resized 300x180");
+    let list = h.state_mut().session.execute("scriptui.list", json!({})).unwrap();
+    assert_eq!(list[0]["size"], json!([300.0, 180.0]), "{list}");
+    assert!(h.state_mut().session.execute("scriptui.resize", json!({"window": "Sized", "size": ["wide", 1]})).is_err());
+    h.state_mut().session.execute("scriptui.close", json!({})).unwrap();
+    // A docked panel: its window is its dock's size, not its preferred size.
+    h.state_mut().session.execute("window.scriptPanel", json!({"name": "Layer Tools.jsx"})).unwrap();
+    h.run_steps(4);
+    let panel = h.state().session.script_ui.windows.iter().find(|w| w.script == "Layer Tools.jsx").unwrap().clone();
+    let dock = rect(&h, &format!("scriptui.{}", panel.id));
+    assert_eq!([panel.root.bounds[2].round(), panel.root.bounds[3].round()], [dock.width().round() as f64, dock.height().round() as f64]);
+    h.state_mut().close_panel(PanelKind::ScriptPanel(panel.id));
+    h.run_steps(2);
+}
+
 fn click_at(h: &mut Harness<'_, EffectcraftApp>, c: egui::Pos2) {
     h.input_mut().events.push(Event::PointerMoved(c));
     h.run_steps(1);
diff --git a/crates/ui-egui/tests/it/ui_timeline_shapes.rs b/crates/ui-egui/tests/it/ui_timeline_shapes.rs
index 73686ee99..ae1e5a17f 100644
--- a/crates/ui-egui/tests/it/ui_timeline_shapes.rs
+++ b/crates/ui-egui/tests/it/ui_timeline_shapes.rs
@@ -340,6 +340,11 @@ fn timeline_colour_eyedropper_samples_the_comp() {
     let fill = fill.expect("a fill colour");
     fn groups(g: &effectcraft_engine::project::PropGroup, out: &mut Vec<u64>) {
         for c in g.groups() {
+            // The rectangle's path rows would push Fill below the rows the Timeline fits; the
+            // eyedropper only needs Fill, so leave that group collapsed.
+            if c.name == "Rectangle Path 1" {
+                continue;
+            }
             out.push(c.uid);
             groups(c, out);
         }
@@ -448,3 +453,42 @@ fn effects_drag_to_a_new_place_in_the_timeline() {
     h.state_mut().session.execute("edit.undo", json!({})).unwrap();
     assert_eq!(names(&h), ["Tint", "Gaussian Blur", "Invert"], "one undo step per drop");
 }
+
+/// #2552: Shift-clicking effect rows in the Timeline adds them to the selection (and a second
+/// Shift-click takes one out), so one animation preset can hold several effects.
+#[test]
+fn shift_click_selects_several_effects_for_a_preset() {
+    let mut s = session();
+    let l = s.execute("layer.newSolid", json!({"name": "Plate", "color": "#406080"})).unwrap()["layer"].as_u64().unwrap();
+    for fx in ["Gaussian Blur", "Invert"] {
+        s.execute("effect.apply", json!({"layers": [l], "effect": fx})).unwrap();
+    }
+    let effects = s.active_comp().unwrap().layer(LayerId(l)).unwrap().props.sub("effects").unwrap().clone();
+    let uids: Vec<u64> = effects.groups().map(|g| g.uid).collect();
+    let mut h = harness(s);
+    h.state_mut().ui.timeline.open_groups.insert(effects.uid);
+    open_layer(&mut h, l);
+    let shift_click = |h: &mut Harness<'_, EffectcraftApp>, uid: u64| {
+        let p = center(h, &format!("timeline.group.{uid}.name"));
+        h.input_mut().events.push(Event::ModifiersChanged(Modifiers::SHIFT));
+        h.input_mut().events.push(Event::PointerMoved(p));
+        h.step();
+        for pressed in [true, false] {
+            h.input_mut().events.push(Event::PointerButton { pos: p, button: PointerButton::Primary, pressed, modifiers: Modifiers::SHIFT });
+            h.step();
+        }
+        h.input_mut().events.push(Event::ModifiersChanged(Modifiers::NONE));
+        h.run_steps(2);
+    };
+    let selected = |h: &Harness<'_, EffectcraftApp>| h.state().session.state.selected_props.iter().map(|(_, u)| *u).collect::<Vec<_>>();
+    click(&mut h, &format!("timeline.group.{}.name", uids[0]));
+    assert_eq!(selected(&h), [uids[0]]);
+    shift_click(&mut h, uids[1]);
+    assert_eq!(selected(&h), [uids[0], uids[1]], "Shift adds the second effect");
+    let path = std::env::temp_dir().join(format!("ec-2552-{}.ffx", std::process::id()));
+    let r = h.state_mut().session.execute("anim.savePreset", json!({"path": path.to_string_lossy()})).unwrap();
+    assert_eq!(r["effects"], 2, "{r}");
+    let _ = std::fs::remove_file(&path);
+    shift_click(&mut h, uids[1]);
+    assert_eq!(selected(&h), [uids[0]], "a second Shift-click takes it out");
+}
diff --git a/docs/agents.md b/docs/agents.md
index 033762da4..7f3fd9ad3 100644
--- a/docs/agents.md
+++ b/docs/agents.md
@@ -463,7 +463,12 @@ and Origin), `camera.createFromSolve {kind: text|solid|null|shadowCatcher, point
 {center, normal, size?}, multiple?}` (Create Text / Solid / Null / Shadow Catcher, Camera and Light,
 Create Multiple …), `camera.deletePoints {points?, wait?}` (re-solves; with Auto-delete Points
 Across Time the same feature's other tracks go too) and `camera.create` (the Create Camera button).
-Each is one undo step; the first create adds the one-node "3D Tracker Camera" keyed on every frame.
+Each edit is one undo step; the first create adds the one-node "3D Tracker Camera" keyed on every frame.
+
+`camera.exportBlender {path: ".py", layer?, effect?, sensorWidth?: 36, unitScale?: 0.01,
+startFrame?: 1, includePoints?: true}` exports the solve as an executable Blender scene script:
+baked camera/lens/focus, synced video background, points and ground. See
+[Blender camera export](blender-camera-export.md) for framing, assumptions and limitations.
 Changing the layer's frames clears the analysis; changing `effects/#1/shotType`,
 `effects/#1/horizontalAngleOfView`, `effects/#1/advanced/solveMethod` re-solves the stored tracks.
 
diff --git a/docs/blender-camera-export.md b/docs/blender-camera-export.md
new file mode 100644
index 000000000..d102eef4f
--- /dev/null
+++ b/docs/blender-camera-export.md
@@ -0,0 +1,101 @@
+# Exporting a tracked camera to Blender
+
+After the **3D Camera Tracker** finishes solving, click **Export Scene to Blender...** in its
+Effect Controls and save the `.py` file. In Blender 4.0 or newer, open it in the Scripting
+workspace's Text Editor and choose **Run Script**. The script creates and activates a new scene;
+it preserves existing scenes and objects. Save the resulting `.blend` normally.
+
+The script uses Blender's public Python API, with no add-on or Python dependencies beyond
+Blender itself. For unattended use: `blender --background --python "Tracked Scene.py"`.
+That imports the scene in memory; it does not automatically save a `.blend`.
+
+## Transferred data
+
+- Camera position and quaternion rotation baked on every analyzed frame, with consistent
+  quaternion signs and linear interpolation; zoom/lens animation, including Variable Zoom.
+- Tracking input/video resolution, horizontal sensor fit, exact rational composition FPS,
+  frame range and composition markers within the analyzed interval. The first analyzed frame
+  becomes Blender frame 1 by default; the original composition timestamps remain in metadata.
+- The original video or still as the camera's background image, at full opacity, refreshed on
+  frame changes. Source-frame offsets are baked too, accounting for trim, stretch, source FPS
+  and Time Remap. This is a viewport background, not a render/compositor background.
+- Focus distance, DOF switch, f-stop, iris blade count, rotation and aspect sampled from the
+  tracker's linked **3D Tracker Camera**, including keyframes and expressions. Create that
+  camera and adjust its Camera Options before exporting to transfer custom focus settings.
+- Solved 3D points as a non-rendering vertex mesh, with point attributes for track ID,
+  reprojection error and first/last visible frame. A chosen ground plane becomes Blender's XY
+  plane, with its origin preserved and a non-rendering wire plane as a placement guide.
+- Shutter duration (not automatically enabled), plus the original shutter phase in metadata.
+- A Blender Text datablock named `EffectCraft Tracking Metadata.json` containing the complete
+  solve, optional original 2D tracks, per-frame timings, source interpretation, diagnostics and
+  export warnings. Radial distortion coefficients are also camera custom properties.
+
+Coordinates are converted from EffectCraft's right/down/forward world to Blender's
+right/forward/up world, including the camera's local up and negative-Z viewing direction.
+Export uses the tracking input's framing, not the footage layer's final 2D placement in the
+composition. Camera pose and lens always come from the solve; subsequent manual pose/lens edits
+on the linked camera are not substituted for the tracked motion.
+
+## What cannot be inferred
+
+Monocular tracking cannot recover absolute scene scale, physical sensor size, optical focus,
+f-stop or exposure from feature tracks. The default sensor width is an assumption of **36 mm**;
+the focal length in millimeters is derived from it while preserving the solved field of view.
+The default scale is **0.01 Blender units per composition-world pixel**, not a measurement.
+Without a linked camera, DOF is disabled and focus distance uses the default solved scene depth.
+Blender's physical DOF approximates EffectCraft's blur model: Blur Level and Iris Roundness are
+retained in metadata, but have no direct Blender equivalent.
+
+Brown-model radial `k1`/`k2` coefficients use radius normalized to half the image diagonal.
+They are preserved, **not** assigned to Blender's different lens-distortion model. For a precise
+match when distortion is nonzero, use an undistorted plate; the script prints a warning.
+The tracker assumes square pixels, so Blender renders square pixels; any non-square source
+interpretation is retained in metadata and flagged.
+
+The `.py` references the video; it does not contain a copy of the video's bytes. When moving it,
+keep the video next to the script (same filename), or relink the background image in Blender.
+Missing/unsupported media produces a warning while retaining the imported camera and geometry.
+Masks and effects applied before the tracker are not baked into the original media. Export
+requires a direct video/still footage layer at the analyzed size; render precomps, sequences or
+size-changing preprocessing to a video and track that video first.
+
+## Agent / control-channel command
+
+```json
+{
+  "command": "camera.exportBlender",
+  "params": {
+    "layer": "#1",
+    "path": "/output/Tracked Scene.py",
+    "sensorWidth": 36,
+    "unitScale": 0.01,
+    "startFrame": 1,
+    "includePoints": true
+  }
+}
+```
+
+`comp`, `layer` and `effect` select the tracker as with `camera.analyze`. Without explicit
+selection, the selected tracker (or first tracker in the composition) is used. `sensorWidth`,
+`unitScale`, `startFrame` and `includePoints` are optional. The reply contains file size,
+exported frame/point counts and warnings. Writing uses the host's atomic file service.
+Calls issued by scripts require **Allow Scripts to Write Files and Access Network** in
+Settings ▸ Scripting & Expressions. Export from the UI or control channel remains available
+with that preference off.
+
+Export is limited to 100,000 analyzed frames, 100,000 points and 64 MiB of serialized scene data;
+invalid, stale or incomplete solves return an actionable error without modifying the document.
+
+## Verification
+
+Engine tests check argument validation, escaped/Unicode paths, fractional FPS, trim/stretch,
+focus/f-stop, zoom, ground placement, malformed solves and write failures. To additionally run
+the generated artifact against an installed Blender's public API:
+
+```sh
+EFFECTCRAFT_BLENDER=/path/to/blender cargo test -p effectcraft-engine tests::blender -- --nocapture
+```
+
+Optionally set `EFFECTCRAFT_BLENDER_PLATE` to a local synthetic 640×360 video to exercise media
+loading and source-frame offsets. The oracle checks every synthetic point's projection through
+the imported camera on every frame, as well as animation, DOF, timing and scene preservation.
diff --git a/docs/scripting-parity.md b/docs/scripting-parity.md
index 8d2934518..96e298ece 100644
--- a/docs/scripting-parity.md
+++ b/docs/scripting-parity.md
@@ -20,7 +20,7 @@ our own scripts; no real-world script library has been run against both apps.
 | Expression performance | Cached, multi-frame | Per-thread boa contexts | unknown | No benchmark |
 | Scripting object model | `app`, `Project`, items, layers, properties, keys, eases, render queue, `TextDocument`, `Shape`, markers, `File`/`Folder`, `Socket`, `app.settings` | Same classes, edits run through undoable engine commands; match names table; layers, groups and properties are callable (`layer("Effects")(1)` is `.property(...)`) | good | `crates/script` tests (≈ 10 test files) |
 | `$.evalFile`, `BridgeTalk` | Evaluate another script file; identify the host application and message other Adobe applications | `$.evalFile` evaluates a file relative to the calling file (nested at most 32 deep, under the scripts' file gate) and returns its last value; `BridgeTalk` names the host honestly (`appName` `effectcraft`, its version); messaging other applications throws "not supported" | partial | `tests_evalfile.rs` (#760); no inter-application messaging |
-| ScriptUI | Dialogs, palettes, dockable panels, resource strings, `onDraw` / ScriptUIGraphics, mouse events | Same, dockable panels reopen at launch | good | `ui_scriptui`, `tests_ui*` |
+| ScriptUI | Dialogs, palettes, dockable panels, resource strings, `onDraw` / ScriptUIGraphics, mouse events | Same, dockable panels reopen at launch; a docked panel gets its dock's size and `onResize` (`scriptui.resize`, #2585); a drag keeps reaching the control it started on past the window edge, and `MouseEvent.buttons` reports the held buttons (#2584) | good | `ui_scriptui`, `tests_ui*` |
 | `app.scheduleTask` / `cancelTask` | One-shot and repeating tasks (polling, panel refresh) until `cancelTask` | Same: repeating tasks run every `delay` ms (at least 50 ms, at most 64 pending per script) until `cancelTask`, until they throw (reported once, then cancelled), or until their owner goes: a script's last window closing, or the project closing for scripts without windows (a Startup script's tasks go on until EffectCraft quits); frontends tick them every frame, agents with `script.runTasks` | good | `tests_tasks.rs` (#773); one-shot tasks of a script file still run right after it, not after their delay |
 | Scripts menu, ScriptUI Panels folder | yes | yes; a subfolder (one level) of either folder is a submenu named after it | same | [plugins.md](plugins.md) |
 | Startup / Shutdown folders | yes | `Scripts/Startup` runs at launch and `Scripts/Shutdown` runs as the desktop app quits, after the project is closed, each in alphabetical order | partial | `crates/script/src/tests/startup.rs`; each script has its own global scope, so a Startup script's variables and functions are not available to later scripts ([plugins.md](plugins.md)) |