I'm having an issue with normal map baking from a hi poly to lo poly object where occasionally, and seemingly at random, certain faces of my object don't have anything rendered to the Normal image.
If I click the bake button again, without changing anything, it will rebake and a different face will be missing from the image. I have my normal map now just from pure luck clicking bake 10 or so times until it happened to bake each face.
Why is this happening? It seems weird that it's at random...