The solution is probably very simple, but i didn''t find it. For a single polygon, as soon as a vertex goes off the limit of the screen, the polygon looks like warped. At first i thought it was just a texture warping, but after looking closer, it seems that the vertice(s) that are outside the screen aren''t at their correct position. The polygons that are entirely in the screen are fine. I tried to change the frustrum, the clipping planes, the texture parameters, but i still have the problem. I''m running out of ideas...any suggestion ?