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…

Quake III Arena - Wikipedia

Fast Inverse Square Root — A Quake III Algorithm

Algorithms for Calculating the Square Root and Inverse Square Root

GitHub - youhavethewrong/q_rsqrt: Implementation of the fast

Fast Inverse Square Root — A Quake III Algorithm

Exploring Quake 3's Fast Inverse Square Root

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

Quake III Arena's Unknown Algorithm Explained

Quake: John D. Carmack, Id Software, QuakeC, Quake II, Quake III

Exploring Quake 3's Fast Inverse Square Root

Quakes fast inverse square root implementation is a joke by itself

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

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

Cool Code - Quake 3 Fast InvSqrt() - Particl Digital