Posts: 15,941
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Joined: Jun 2008
Quote:
Originally Posted by jlalt
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99% of the time you don't need floatsqroot. Yes, if you want the exact distance you need it, but most people just want to know if something is in range of something else. To check the range you do "if (distance < range)". However, getting the distance requires a square root. Instead, you can square the distance and square the range: "if (distance * distance < range * range)". Since a square root followed by a square is equivalent to nothing, this is the much faster: "if (partial_distance_calculation < range * range)".
