I am "feedbacking": well, I think you mean c_updatehull , thogh , I don't think I need it, it takes a lot of fps and it is basically for changing the bounding box if the animation changes, e. g. if the player ducks ,then lies, then stands. So it will change the bounding box each frame as the player is running, which I don't need. I tried to write some new values for the bounding box and put the c_setminmax in the loop, and it now works fine... I think it was the engine bug or something... I hope it won't happen again, unless I understand why yhis happens.