I was importing some Wavefront Object files with
bpy and noticed that the textures/materials were going berserk. I know the .obj files are good as they come from a large dataset used for research.
I wondered if it was just the Python interface, but sure enough, it still happens when I import it though the UI.
My best guess is that the surface normals are incorrect since it seems to happen both in solid object view and textured view. It may also be the UV coordinates being registered from top-left instead of bottom-left or something though. Any ideas?