Thread:Allenallenallen333/@comment-4724333-20140905165005/@comment-3499785-20140905205715

The automatic calculation of normals is based on the angles and uhh... other things I don't know... of your model. So the only way for it work correctly, you must fix the angles, double vertices, double faces and any other geometry 3D problems. If you still can't get it to work correctly. Send the file to me. I'll manually inspect the model to see which part of it is causing the normals problem.

Also, missing normals can be caused by wrong UVs.