Depth buffer built with withOwners: true.
Basis-space d-coordinate of the projection
plane (i.e. dot(planePoint, buffer.basis.forward)). The
orchestrator computes this from the AABB extent along
basis.forward plus the user-supplied offset, and the
extractor uses it to lift each pixel back to a 3D world
point on the plane.
Tuning parameters.
Extract filled-polygon geometry, one per source SceneMesh that contributed at least one frontmost pixel to
buffer.