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Add Chromium-only Blender WebEngine parity work

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mes123456
2026-08-12 04:47:48 -04:00
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# W-050 Status
status: done_current_scope
task: SceneIR adapter
ViewportRenderer now tags imported meshes and lights with
`userData.blenderId`, `userData.sceneNodeId` and `userData.revision`, keeps a
Blender-ID object index, and exposes `applyDelta()`. Pure node visibility and
transform updates mutate the existing Three object; node lifecycle changes
fall back to a validated snapshot rebuild so geometry/material ownership stays
correct.
The adapter now performs mesh raycast selection and applies multi-selection
highlights, consumes binary WBG1 mesh resources, and installs validated LOD
levels with hysteresis. Resource-aware SceneDelta entries trigger a validated
resource rebuild while node-only deltas update existing Three objects.
The Worker keeps the previous geometry generation and emits byte-range patches
or affected-mesh replacements. Objects sharing one Blender Mesh datablock are
coalesced into a raycastable `InstancedMesh` with per-instance transform and
selection. A capability-gated OffscreenCanvas Worker owns WebGL when requested;
browsers without that capability retain the same main-thread renderer.