OptionalifcIf set then this mesh contains IFC data.
Optional InternallineSet by LineRenderer when constructed with
depthParticipation: true. Signals to ShortFrustumDepthRenderer that
this mesh should be included in the depth-render pass, using
depthMaterial (a custom thin-instance-aware depth material that knows
how to compute correct depth from the per-instance segStart/segEnd
attributes). Lets DWG-style line meshes participate in LineShading +
SSAO post-processes the same way IFC meshes do.
Clear cached vertex data of this mesh. Basically this removes the cached vertex data from RAM (but not from GPU). This has the same effects as calling Scene.clearCachedVertexData (except that it only affects this particular Mesh).
Twinfinity extensions for Mesh.