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Quake 3 was probably the most famous first-person shooter back in 1999. It had fascinating graphi...
Quake 3 was probably the most famous first-person shooter back in 1999. It had fascinating graphics and very high-responsiveness which is the result of a performance optimization and high-quality code written by id
Software team. One of the most famous optimization tricks is the function that computes the approximate of inverse (reciprocal) square root through some clever bit hacking. This function is the subject of investigations by mathematicians and programmers even today. In this presentation we try to understand how it works and we also try to find the author.