Clément Foucault
337aab59e9
This fixes the problem that matcaps have when using a very larg FOV in perspective view. This was because it was stupidly using the normal direction which can not aligned with the view vector under perspective. So to workaround this problem we don't use the normal as is, but compute how much it's facing the camera. This changes how matcaps looks in perspective because they now always use the full range of the matcap (which is expected).