skinnedPoseUnionAabb property
For skinned primitives only: union of vertex positions across every pose the primitive can take under the file's animations, computed offline by sampling each animation's keyframes and applying the resulting joint palette.
In the same local space as bounds_aabb (the mesh's vertex-position
space). Lets the runtime cull skinned content soundly instead of
treating it as always-visible. Absent on unskinned primitives, and
on skinned primitives when offline pose-union analysis isn't
available (e.g. older importer output).
Implementation
Aabb3T? skinnedPoseUnionAabb;