I've got an odd lightning problem.
I have this model with several planes. I use environment lightning and 1 directional light. In the pictures I have linked the directional light is aimed directly at the front of the model. However the planes on the top part of the model receives inverse light.
I have tried flipping the normals and in the pictures the model uses double mesh on the planes with normals in each direction. The issue still there.
I have turned double sided material on/off. Same story.
If I shift from normal to bump map the lighting is fine, but I would of course like to use my normal map as a normal map.