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…

Behind the Performance of Quake 3 Engine: Fast Inverse Square Root

Fast Inverse Square Root: Most Up-to-Date Encyclopedia, News & Reviews

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

Fast Inverse Square Root: Most Up-to-Date Encyclopedia, News & Reviews

Quake III's Fast Square Root - That One Game Dev

Behind the Performance of Quake 3 Engine: Fast Inverse Square Root

Řrřlog :: Improving the fast inverse square root

Benchmarking Carmack's fast inverse square root - One Step! Code

The Mathematics Behind the Fast Inverse Square Root Function Code

Fast inverse square root

Quake III Arena - Wikipedia

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

Computation, Free Full-Text

Computation, Free Full-Text

Fast Inverse Square Root — A Quake III Algorithm