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

Math or Game Developers - Fast Inverse Square Root

Delphi – Fast Inverse Square Root – Quake 3 Arena

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

The Mathematics Behind the Fast Inverse Square Root Function Code

Computation, Free Full-Text

Quake III's or Fast InvSqrt() or 0x5F3759DF Algorithm

Fast inverse square root

Fast Inverse Square Root — A Quake III Algorithm

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

Entropy, Free Full-Text

Fast Inverse Square Root — A Quake III Algorithm

Exploring Quake 3's Fast Inverse Square Root