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Posts Tagged ‘algorithm’
black magic: 0x5f3759df
The number 0x5f3759df is a magic constant that can be used to calculate the inverse square root of a number very efficiently. See this post for a detailed explanation. Now if you come across this number (which can happen anywhere, anytime), you will say “aha, I know that one”.
Categories: Uncategorized
Tags: algorithm, hack, inverse sqrt, inverse square root, john carmack, programming, quake 3 arena
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