the normal towards the viewer, seems to give consistent results with blender internal, cycles, normal maps, etc. Started from patch #32761 by Vitor Balbio, but changed it to do normal flipping earlier so it solves all cases.
the normal towards the viewer, seems to give consistent results with blender internal, cycles, normal maps, etc. Started from patch #32761 by Vitor Balbio, but changed it to do normal flipping earlier so it solves all cases.