Yes, I'm afraid so. I was playing around with it (see next blog entry) and had to fix a little problem in the calculation of Normals collection in the PolyhedronMeshBase class. The source code for my book 3D Programming for Windows is normally downloadable here and includes 0.9.0.0 or the Petzold.Media3D library. However, version 0.9.1.0 (and all future updates) of Petzold.Media3D is available here . Read More...