hllmn.net

Hi, I am Noah Hellman, I like computers and programming. You can reach me at noah@hllmn. rm-this-sld-if-you-see-it. net .

Popular posts: 2
Total points: 365
HN comments: 115
Rank: #7,343 personal

Visit hllmn.net → RSS feedOn Hacker News Apr 2023 – Sep 2023

Software Engineering 1 Networking & Internet 1 Math & Algorithms 1 Games & Graphics 1

Most points Most discussed Most cited Newest

Revisiting the Fast Inverse Square Root – Is It Still Useful?

2023145 points51 comments Software Engineering details

In 2005, id Software released the source code for their 1999 game Quake III Arena under the GPL-2 license. In the file code/game/q_math.c , there is a function for calculating the reciprocal square root of a number which at first glance seems to use a very peculiar algorithm: