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

Ever play Quake while growing up? Aside from the game itself, the code written to build it is home to a small piece of history in being able to get around the very expensive inverse square root function using very accurate, very fast approximation. The code, specifically how the mythical constant(0x5f3759df) was derived is still…

The Legendary Fast Inverse Square Root, by Shaw, Hard Mode

TIL Quake III Arena, needing to calculate x^(-1/2) quickly, used a piece of code so strange, the developers commented the code with evil floating point bit level hacking and what the fuck?

PDF) A Modification of the Fast Inverse Square Root Algorithm

Tales of an Indie Developer: 2006

FixedPoint

Entropy, Free Full-Text

FAST INVERSE SQUARE ROOT - PDF Free Download

Computation, Free Full-Text

REVEALED: Quake III's SECRET Algorithm!

Fast inverse square root - Wikipedia

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