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Intersection of polygons

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Hello, I''m wrote a 2D game with the d3d API because i wanted bitmap rotation, and a few of the other advantages that you get with 3d. But im having trouble detecting collisions. I wanted to know if somone could point me to a site that explains how to detect if polygons intersect. Right now all objects are flat and made of 2 polys each. so i just need to check if they overlap at all. Thx

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