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minor Vector::refract() sign changes

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git-svn-id: svn://anubis/fart/trunk@377 7f9b0f55-74a9-4bce-be96-3c2cd072584d
This commit is contained in:
Josh Holtrop 2010-10-12 15:50:00 +00:00
parent 22f4a79671
commit b24aea4dba
1 changed files with 2 additions and 2 deletions
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4
util/Vector.h
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@ -73,11 +73,11 @@ class Vector
Vector refract(const Vector & target, double n1, double n2) const Vector refract(const Vector & target, double n1, double n2) const
{ {
const double n = n1 / n2; const double n = n1 / n2;
const double cosI = dot(target); const double cosI = -dot(target);
const double sinT2 = n * n * (1.0 - cosI * cosI); const double sinT2 = n * n * (1.0 - cosI * cosI);
if (sinT2 > 1.0) if (sinT2 > 1.0)
return Vector(0.0, 0.0, 0.0); return Vector(0.0, 0.0, 0.0);
return (*this) * n - target * (n * cosI + sqrt(1.0 - sinT2)); return (*this) * n + target * (n * cosI - sqrt(1.0 - sinT2));
} }
Vector getPerpendicular() const Vector getPerpendicular() const