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

Do you know what is Fast inverse square root

Exploring Quake 3's Fast Inverse Square Root

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

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

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

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

Fast Inverse Square Root — A Quake III Algorithm_哔哩哔哩_bilibili

Fast inverse square root - Wikipedia