Distance and inverse sqrt

Math and Physics Programming

Started by skow June 03, 2005 05:19 PM

2 comments, last by skow 18 years, 10 months ago

248

Author

June 03, 2005 05:19 PM

I am looking for the fastest method to calculate my distance. I have a program that tests different sqrt functions out there. I am finding many fast inverse sqrt functions, is there any way to utilize these for distance other than dividing 1.0f by the result?

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John Schultz

811

June 03, 2005 05:24 PM

Quote:Original post by skow
I am looking for the fastest method to calculate my distance. I have a program that tests different sqrt functions out there. I am finding many fast inverse sqrt functions, is there any way to utilize these for distance other than dividing 1.0f by the result?

sqrt(x) = x*sqrtInverse(x)

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jovani

100

June 03, 2005 05:25 PM

y = x * rsqrt (x)

rqrtf(x) is the very fast newton-rapson aproximation that is floating around everywhere.