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2D Spatial partitioning alternatives to spatial hashes and quadtrees

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I've been trying to implement a spatial partitioning algorithm in my game, but both spatial hashes and quadtrees aren't what I'm looking for. My level size is not supposed to have a limit (only Int32 limits). I need a spatial partitioning algorithm that doesn't need a "Level Width" and a "Level Height". I have many moving physical objects. I need the algorithm to be fast enough to support 500+ objects. Any alternative? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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I've decided to go with fixed 2D grids. I've made two videos which explain in-depth how I implemented them, and the current implementation is available on my GitHub page: https://github.com/SuperV1234/SSVSCollision http://www.youtube.com/watch?v=7HY_SqqaoL4 http://www.youtube.com/watch?v=vYB37BDtHuQ

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