Collision Detection with Occlusion Queries Redux Jul 23, 2008

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Tags: Algorithms, Collision detection, Game programming, OpenGL, Source code, Video games

Here we describe a method for checking collisions between arbitrary objects drawn by the GPU. The objects are not limited to any shape, complexity or orientation. The objects that are checked for collisions can be the same objects that are drawn on the screen. The algorithm is pixel perfect but without further refining is limited to 2D collisions.

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Hardware-accelerated 2D collision detection in OpenGL Jul 11, 2007

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Tags: OpenGL, Programming, Quake 2, Side-scroller, Video

I wrote a better document about the algorithm. Includes source code.
The idea
Did you know you can do pixel accurate collision detection using the OpenGL stencil buffer and occlusion queries? I got this idea while working on a 2D/3D game engine (think of a side-scroller but with 3D objects).

A proof that this actually works [...]

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