I seem to remember reading somewhere this might have something to do with faces, but I can’t find any specific reference to it any more.
Windows especially are giving me problems. For example, I made this set of french doors - really doesn’t make sense, because I never touched the glass material, I just modified the doors that I downloaded from a manufacturer, and applied some Sketchup material, then applied the Twilight material, it’s consistent on each left and right side door, but two weird things:
When I turn on shadows, only one side casts a shadow of the door handle, and when I render, only one side looks like a mirror instead of transparent glass.
This is so frustrating! When I use the paint dropper, the SU materials are identical, and the Twilight material applied is identical, why are they behaving differently?
interior-french-doors.skp (524.5 KB)