# 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.