looks nice. I am afraid I gotta restart pretty much from scratch. Or at least we have to drop the Idea of a single mesh, because this is the typical behaviour of single Mesh Alpha Z-order mess. I guess the only reason this don't happens in the editor is because there you are using 6 independent meshes. So there are two ways: Save 6 meshes, or save one mesh and then after loading split it up into surfaces and make 6 meshes out of it. Both is kinda sucking, but I think it's required to prevent the z-order problem.