- Collapsed precomps: the renderer records the precomp layers a nested comp is drawn through;
motion-blur sub-samples re-evaluate their transforms (when their motion blur is on) and map
times down through each one, so the precomp layer's own motion blurs its nested layers. The
containing (outermost) comp's shutter applies to collapsed layers. The GPU compositor gets
this through Renderer::placement.
- Shape and text layers whose content changes within the shutter (compared by its cache key)
draw their source at Samples Per Frame times and average them; the cache key covers every
sub-sample's content.
- Tests: tests_motion_blur_depth (collapsed vs flat, the containing shutter, shape content vs
the same move by Position); each fails without the change.
- Docs: roadmap, parity.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
