Hello, I'm generating 3D building model from 2D plan. My problem is that for roof I can see some triangles having different lighting than the other ones. (see the picture) How do I construct it? I have a polygon representing roof part. I triangulate it and create DxfPolyfaceMesh object with all triangles included as DxfMeshFace. Thanks in advance Mariusz

Can't really tell without input data and code. But it looks like you have some jumps in the z-coordinate there. Perhaps first strip your sample to a few triangles and find out what the issue is with the coordinates? - Wout