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S2.69: several objects in one Roto Brush instance, tracked in one SAM 2 pass

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Strokes carry an object (0 for older projects, nothing written for 0). The
tracker follows every object in one pass and the mattes are united; the
confidence of a frame is the least sure object's. Object picker in the Layer
panel's bar; roto.options/stroke/clearStrokes/status take or report objects.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Kristian Myram
2026-10-30 08:43:32 +01:00
co-authored by Claude Sonnet 5.5
parent fd1d6e623f
commit 08bf6e43fe
12 changed files with 382 additions and 55 deletions
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crates/engine/src/tests/roto.rs
+25
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@@ -1007,3 +1007,28 @@ fn a_correction_re_tracks_only_the_frames_it_changes() {
assert_eq!(trust.len(), 21);
assert!(trust.values().all(|t| t.confidence > 0.9 && !t.occluded));
}
#[test]
fn strokes_belong_to_the_current_object() {
let mut s = Session::default();
s.execute("comp.new", json!({"width": 64, "height": 64, "frameRate": 25, "duration": 1})).unwrap();
let layer = s.execute("layer.newSolid", json!({"width": 64, "height": 64})).unwrap()["layer"].as_u64().unwrap();
s.execute("roto.stroke", json!({"layer": layer, "points": [[10, 10]], "radius": 4})).unwrap();
// the current object is an option shared by the tool and the commands
s.execute("roto.options", json!({"object": 1})).unwrap();
s.execute("roto.stroke", json!({"layer": layer, "points": [[50, 50]], "radius": 4})).unwrap();
s.execute("roto.stroke", json!({"layer": layer, "kind": "bg", "points": [[30, 30]], "radius": 4})).unwrap();
// an explicit object wins over the option, and is clamped to the supported range
s.execute("roto.stroke", json!({"layer": layer, "points": [[20, 50]], "radius": 4, "object": 99})).unwrap();
let st = s.execute("roto.status", json!({"layer": layer})).unwrap();
assert_eq!(st["currentObject"], 1);
assert_eq!(st["objects"], json!([{"id": 0, "strokes": 1}, {"id": 1, "strokes": 2}, {"id": 31, "strokes": 1}]));
// removing one object's strokes leaves the others
let r = s.execute("roto.clearStrokes", json!({"layer": layer, "object": 1})).unwrap();
assert_eq!(r["removed"], 2);
let st = s.execute("roto.status", json!({"layer": layer})).unwrap();
assert_eq!(st["objects"], json!([{"id": 0, "strokes": 1}, {"id": 31, "strokes": 1}]));
// the object survives a save and a load
let json = s.project.to_json();
assert!(json.contains("\\\"object\\\":31"), "the project file carries the object");
}