i found an artifact in the tutorial ( "08 - Materials.cpp").
see screnshot. what is it ?

yes, I'm aware of that, however fixing this will slow down fur rendering very much so I'm not doing this

i think you're right. even in some games (Dragon Age, Assassins Creed 2, Mass Effect 2), i found the artifacts worse than this . the atmosphere of the game hides some of its flaws. performance should be in first place.