Beyond3D(Rys) wrote an article (almost a series!) about the history of the magic fast inverse square root found in for example the quake code. With the explantions it doesn’t seem quite that much as magic. As this pdf says, its not magic at all(page2) 
The history article is all about paying homage to the author(s) and finding the origin. And it really is very very slick way of doing it. The article even uses this as an example of why it’s good that games and software gets release as open source in some form.
I’m just wondering: Why isn’t there any comments in this very sleek code?
If it was me using übercool constants for nice approximations in my code I sure would hope i would comment it!
The Fast inverse square root by Søren Bjerregaard Vrist, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.
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