One source SceneMesh's projected fill, ready to feed into a
SceneModel as a TrianglesPrimitive geometry. Positions are
laid out as flat XYZ triples in world space, on the projection
plane (depth axis fixed at aabbFaceValue + offset).
Granularity is per source SceneMesh, not per source
SceneObject — so callers can emit one fill mesh per source
mesh and mirror the source SceneModel's mesh/object
hierarchy faithfully (including per-mesh colour).
One source SceneMesh's projected fill, ready to feed into a SceneModel as a TrianglesPrimitive geometry. Positions are laid out as flat XYZ triples in world space, on the projection plane (depth axis fixed at
aabbFaceValue + offset).Granularity is per source SceneMesh, not per source SceneObject — so callers can emit one fill mesh per source mesh and mirror the source SceneModel's mesh/object hierarchy faithfully (including per-mesh colour).