3 ms·

I tried implementing it in JS just for fun. I don't get how/why it works, but it does. http://codepen.io/anon/pen/OWgYaP http://codepen.io/anon/pen/OWgYaP

• popey456963 10y ago
  Is your implementation correct? I get strange values. Q_rsqrt(16) = 0.24957678739619552 I'm not sure if I'm just not doing something correctly. Even if I go to a smaller number I get: Q_rsqrt(0.125) = 2.828426859705843 Which is vastly off (10x ish)
  • Koshkin 10y ago
    More accurate numbers are 0.25 and 2.8284271247461900976033774484194 respectively.
  • echeese 10y ago
    You can compare it to the native implementation here. Looks okay, if a little inaccurate to me: http://codepen.io/anon/pen/KavzKK http://codepen.io/anon/pen/KavzKK