8d297394ba
This fixes most of the cases, the only situation not addressed is when the highpoly object(s) has non-uniform scale. mul_transposed_mat3_m4_v3() should take care of non-uniform scales so I'm a bit confused on why it doesn't work. The lowpoly object can have any transformation, the only issue is if the highpoly object has non-uniform scale. Test file of the remaining issue: https://developer.blender.org/file/info/PHID-FILE-tpw2xgddyzxtpg3e7xzs/ Reference reading: http://www.unknownroad.com/rtfm/graphics/rt_normals.html