3D Part Preview added to Parts Tracker

[Lasse Deleuran]

I can't see anything wrong in the part, or its subparts, that would create extra surfaces. The four trans window panes are created by using the same subfile four times, one for each pane. If there was something wrong, you ought to have the same error in all four.

This tells me that the renderer is making a mistake. I will look into it.