Difference between revisions of "User:Pedro Oval/Uniform random rotation"

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(Added Uniform random rotation)
 
m (Changed link for the reference in the book, as the previous one ceased to work)
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Based on a "graphics gem" by Ken Shoemake [http://www.google.com/search?hl=en&q=%22graphics+gems+iii%22+%22compute+two+uniformly+distributed+angles%22&btnI=1]
Based on a "graphics gem" by Ken Shoemake [http://books.google.com/books?id=xmW_u3mQLmQC&pg=PA130]


<lsl>
<lsl>

Revision as of 04:56, 4 March 2011

Based on a "graphics gem" by Ken Shoemake [1]

<lsl> rotation UniformRandRot() { 

   // Method from Graphic Gems 3, "Uniform Random Rotations"
   // by Ken Shoemake, p.130
   float x0 = llFrand(1.0);
   float a1 = llFrand(TWO_PI);
   float a2 = llFrand(TWO_PI);
   float r1 = llSqrt(1.0 - x0);
   float r2 = llSqrt(x0);
   float s1 = llSin(a1);
   float c1 = llCos(a1);
   float s2 = llSin(a2);
   float c2 = llCos(a2);
   return <s1*r1, c1*r1, s2*r2, c2*r2>;

} </lsl>

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