Does directx7.0 have any mechanism for colission detection? If not, and given that dx7 only describes surfaces as rectngles, wich is the best way to detect colissions inside this rectangles? Any idea will help!!!! fabian

Well, no i don''t think there are any built in collision detection routines in the DirectX API, but your post puzzles me. Surfaces are simply blocks of memory where you can draw things like images or triangles. What kind of colision detection are you therefore after? 3d or 2d? Do you want to detect collision between sprites or 3d objects? It seems like you want to detect colision between sprites inside a surface, but it''s difficult to tell what your asking.