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  Fast collision detection between only boxes  (Read 4970 times)
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Offline shingekinolinus
« Posted 2016-02-04 06:43:29 »

I have a game in which everything is an AABB, and there are a ton of them. The entities exist in a relatively small space, and there is little distance between them. After spawning a few thousand entities, my brute force algorithm O(N^2) crumbles quickly.

Now I know the QuadTreeTM is usually the go-to solution for this kind of problem, however due to the small space between individual entities, entities are often added to multiple nodes. There is a significant performance gain, but once a bunch of entities get pushed together, frame rate drops very quickly.

I'm pretty satisfied with the QuadTree, but soon I came across a solution which claims to offer near O(n) performance, does not rely on partitioning so is not affected by overlapping, and I became obliged to implement it. (see below)

http://0fps.net/2015/01/23/collision-detection-part-3-benchmarks/
https://github.com/mikolalysenko/box-intersect

Unfortunately for me I am not good at Javascript and I ran into a bunch of problems trying to rewrite it.

It is said to be based off the paper here:
http://pub.ist.ac.at/~edels/Papers/2002-J-01-FastBoxIntersection.pdf

Please let me know if you have any ideas on how to implement it, or if there is a better solution to this problem. Any suggestion will be helpful, thanks!
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