Interface SceneContents

Recover model-local geometry before publishing an appearance edit to model state.

Preserve only exactly matching committed appearance owners during source rebuild.

Visits every flat mesh piece in the scene. getAllMeshDataExpressIds gives only the id set; this is the accessor for consumers that need the mesh data itself while walking it, such as feeding a whole-scene geometry pass (#4357).

The overrides currently installed, or null when nothing is painted. The store's pendingColorUpdates is a one-shot signal that is nulled after it flushes, so this retained map is the only readable record of what is painted — useColorOverlaySync re-hands it back to setColorOverrides so meshes that streamed in after the flush get their colour (#3890).

An entity's bounds in its OWN local (pre-transform) frame, unioned across every occurrence sharing the expressId — unlike getEntityBoundingBox, which is a post-transform, world-axis-aligned box and cannot be unioned meaningfully across differently-placed occurrences (#4357).

The resolved local→world placement transform for one entity: row-major 4×4 (16 numbers), Float64Array for full georeferenced precision. Pairs with getEntityLocalBounds to reconstruct an entity's true oriented world box — getEntityBoundingBox above is post-transform and world-axis-aligned instead (#4357).

The single-mesh accessor: one representative mesh per entity, or undefined when the entity has no flat mesh data. When an entity's pieces share a colour their geometry is MERGED into that one mesh; when colours differ, the first piece is returned so per-piece colours stay correct (mirrors Scene.getMeshData). getMeshDataPieces returns every piece; reach for this one when a caller is written against one representative mesh per entity (#4357).

O(1) "is this id in the flat mesh map" — the presence question, without getMeshDataPieces' per-entity extraction out of a colour-merged batch. Pair it with isInstancedEntity to ask the same thing of both geometry paths (useColorOverlaySync does, per settled geometry batch).

O(1) instanced-membership test. getInstancedMeshDataPieces MATERIALIZES world-space triangles per occurrence, so it is never the right way to ask whether an id exists.

Place a canonical model-local source in the current registered model frame.

Turn modelIndex's GPU-instanced occurrences about the render-frame pivot (pivot[0], *, pivot[2]); angle === 0 clears the rotation (#4890). The GPU-instanced counterpart to Renderer.setModelTranslation — flat/authored/batched geometry rotates through the viewer's bake, not this method.