User:Pedro Oval/Uniform random rotation: Difference between revisions
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Pedro Oval (talk | contribs) Reuse r2 to prevent using another local |
Pedro Oval (talk | contribs) m <lsl> to <source> |
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Based on a "graphics gem" by Ken Shoemake [http://books.google.com/books?id=xmW_u3mQLmQC&pg=PA130] | Based on a "graphics gem" by Ken Shoemake [http://books.google.com/books?id=xmW_u3mQLmQC&pg=PA130] | ||
< | <source lang="lsl2"> | ||
rotation UniformRandRot() | rotation UniformRandRot() | ||
{ | { | ||
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return <r1*llSin(a1), r1*llCos(a1), r2*llSin(a2), r2*llCos(a2)>; | return <r1*llSin(a1), r1*llCos(a1), r2*llSin(a2), r2*llCos(a2)>; | ||
} | } | ||
</ | </source> | ||
Latest revision as of 21:35, 23 January 2015
Based on a "graphics gem" by Ken Shoemake [1]
rotation UniformRandRot()
{
// Method from Graphic Gems 3, "Uniform Random Rotations"
// by Ken Shoemake, p.130
float r2 = llFrand(1.0);
float a1 = llFrand(TWO_PI);
float a2 = llFrand(TWO_PI);
float r1 = llSqrt(1.0 - r2);
r2 = llSqrt(r2);
return <r1*llSin(a1), r1*llCos(a1), r2*llSin(a2), r2*llCos(a2)>;
}