Forget usual MSAA. Modern games use deffered rendering and it does not allow correctly working MSAA, that is why lots of modern games struggles with AA.
The solution is to use full scene supersampling AA (which is very hard on resources and usually cuts FPS 2-3 times depending on setting and resolution), or use MLAA or similar shader based AA method, which basically tries to blur edges without knowing anything about geometry (such methods are fast, but they often blur textures too and sometimes causes ghosting and other artifacts).
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