Yang Zhang's Group Google Group

Origin of Quake3's Fast InvSqrt()

zhangyang...@gmail.com (Ang) — Tue, 05 Dec 2006 19:17:09 UT

float InvSqrt(float x){
float xhalf=0.5f*x;
long i=*(long*)&x;
i=0x5f3759df - (i>>1);
x=*(float *)&i;
x=x*(1.5f-xhalf*x*x);
return x;

zhangyang...@gmail.com — Tue, 31 Oct 2006 07:37:49 UT

oct31=dec25 :)
There are 10 kinds of people in the world, those who know binaries and
those who don't.

zhangyang...@gmail.com — Tue, 31 Oct 2006 07:36:45 UT

MIT also hosts a blog website. [link]
To move, or not to move?