OptionalgeometryOptionalmeshesAlready-produced meshes for this model (the viewer's MeshData[]) —
supply them together with originShift from the load's
coordinateInfo to skip the session's own meshing pass. When omitted,
the session meshes the bytes itself on first use.
OptionalorigincoordinateInfo.originShift of the load that produced meshes.
OptionalunitMetres per project length unit; extracted from the file when omitted.
Reuse the app's initialized GeometryProcessor instead of creating one.