I''ve read some of the tutorials on NeHes site, and are now trying to create a fp 3d engine. Right now the engine can do nothing more than display a rectangle. I''ve tried to make the player turn around by rotating the world around the y axis of (0,0,0), that works fine, but when some of the points in the rectangle are out of the screenarea and some are inside the screenarea the colors gets messed up. Does anyone know how to solve this problem.