Render layers built on the existing USD sublayer architecture: each layer is a
file-backed SdfLayer mounted as a sublayer and tagged via custom layer data,
with membership stored in a UsdCollectionAPI on a hidden /RenderLayerData prim.
Activating a layer applies its overrides and isolates it to its members.
"Default" is virtual -- it means all render-layer sublayers muted.
See docs/adr/0002-render-layer.md for the design and rationale.
- RenderLayerManager: create/delete/rename/activate, membership, mute-based
isolation. Sdf-level APIs are used while a layer is muted (Usd-level APIs
can't see muted layers) and Usd-level APIs when active.
- Commands: create/delete/rename/activate and add/remove members, all undoable.
- RenderLayerPanel: layer list with one-click activation and a membership
editor for the selected prims.
- StageEditorPanel / SceneHierarchyPanel: badge render-layer-owned sublayers,
disable their mute/remove controls (they're managed from the Render Layer
panel so the two can't desync), and lock the edit target while a non-Default
layer is active.
- ConnectShaderAttrs/DisconnectShaderAttr: take an explicit editLayer captured
at construction, so undo targets the same layer as execute even if the
ambient edit target changed in between (e.g. a render-layer switch).
Note: SceneHierarchyPanel.h also carries declarations for the sublayers
section added in the following commit.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
