Quake III & the reciprocal square root

In the C source code of the famous game “Quake III — Arena” you can find an incredibly efficient piece of code that seems totally insane and incomprehensible! It is the code for computing the…

February 1st: Exploring the QUAKE III Fast Inverse Square Root by

Entropy, Free Full-Text

Algorithms for Calculating the Square Root and Inverse Square Root

Exploring Quake 3's Fast Inverse Square Root

Fast Inverse Square Root, 978-620-0-80095-4, 6200800952 ,9786200800954

I implemented the infamous Fast Inverse Square Root function from

Is Fast Inverse Square Root still Fast?

PDF) A Correctly Rounded Newton Step for the Reciprocal Square Root

Death of Quake 3's Inverse Square Root Hack, by Doug Foo

Delta Thoughts - Quake III's Smartest Quasi-Square Root