From 36a50a63666f4bb183c7f4051edcf0ac731ffa4b Mon Sep 17 00:00:00 2001
From: Minher0 <minhero@outlook.fr>
Date: Tue, 27 Oct 2026 09:46:32 +0000
Subject: [PATCH] layer.create: the instance copy takes the source's Solo
 switch

A soloed model keeps its Solo switch with its video off, and any_solo
hides non-soloed layers: the copy was excluded and the comp rendered
blank. The copy now takes the Solo over; the source's video stays off.
Covered by instance3d_keeps_the_copy_visible_when_the_source_is_soloed.
---
 crates/engine/src/cmd/create.rs       |  3 +++
 crates/engine/src/tests/instance3d.rs | 24 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/crates/engine/src/cmd/create.rs b/crates/engine/src/cmd/create.rs
index b9aa49424..246108371 100644
--- a/crates/engine/src/cmd/create.rs
+++ b/crates/engine/src/cmd/create.rs
@@ -52,6 +52,9 @@ fn create(s: &mut Session, p: &Value) -> Result<Value> {
                         ItemKind::Solid(Solid { color: [1.0, 1.0, 1.0], width: comp.width, height: comp.height, pixel_aspect: 1.0 }),
                     );
                     let mut l = build::layer(proj, &comp, &name, LayerSource::Solid { item: sid }, (comp.width, comp.height), None);
+                    // A soloed source keeps its Solo switch with video off, and any_solo hides
+                    // the non-soloed copy: the copy takes the Solo over to stay visible.
+                    l.switches.solo = src.switches.solo;
                     // CC Composite referencing the 3D layer: the solid shows its render (the 2D
                     // copy).
                     let fx = effectcraft_effects::find("ec.channel.cccomposite").ok_or_else(|| bad("layer.create", "the CC Composite effect is missing"))?;
diff --git a/crates/engine/src/tests/instance3d.rs b/crates/engine/src/tests/instance3d.rs
index aa31d3944..73577a0a8 100644
--- a/crates/engine/src/tests/instance3d.rs
+++ b/crates/engine/src/tests/instance3d.rs
@@ -231,3 +231,27 @@ fn instance3d_shows_nothing_outside_the_source_layer_range() {
     let outside = s.render(comp, Tick::from_seconds_f64(1.5), RenderOpts::default());
     assert!(outside.data.iter().all(|p| p[3] < 1e-3), "transparent after the source's out point: {:?}", px(&outside, 320, 180));
 }
+
+#[test]
+fn instance3d_keeps_the_copy_visible_when_the_source_is_soloed() {
+    let mut s = session();
+    let model = triangle_model(&mut s);
+    let comp = cid(&s);
+    // Solo the model, then create the instance: any_solo hides non-soloed layers and the
+    // source's video goes off, so the copy has to take the Solo over.
+    s.edit("solo", None, |p, _| {
+        p.comp_mut(comp).unwrap().layer_mut(LayerId(model)).unwrap().switches.solo = true;
+        Ok(())
+    })
+    .unwrap();
+    let before = s.render(comp, Tick::ZERO, RenderOpts::default());
+    assert!(px(&before, 320, 180)[3] > 0.9, "the soloed model shows: {:?}", px(&before, 320, 180));
+    s.execute("layer.select", json!({"layers": [model]})).unwrap();
+    let r = s.execute("layer.create", json!({"op": "instance3d"})).unwrap();
+    let solid = r["layers"][0].as_u64().unwrap();
+    assert!(layer_in(&s, comp, solid).switches.solo, "the copy takes the source's Solo switch");
+    assert!(!layer_in(&s, comp, model).switches.video, "the source keeps its video off");
+    let after = s.render(comp, Tick::ZERO, RenderOpts::default());
+    assert!(px(&after, 320, 180)[3] > 0.9, "the soloed copy shows the model: {:?}", px(&after, 320, 180));
+    assert!(close(&before, &after, 2e-2), "the comp renders the same through the copy:\n{:?}\n{:?}", px(&before, 320, 180), px(&after, 320, 180));
+}