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Fixed #692: sphericalRand() is doing correct distribution on a sphere

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This commit is contained in:
Sergey Kosarevsky 2017-12-11 18:09:07 +01:00
parent 1190ae0b0e
commit 84e6d82051
1 changed files with 5 additions and 6 deletions
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11
glm/gtc/random.inl
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@ -340,13 +340,12 @@ namespace detail
template<typename T>
GLM_FUNC_QUALIFIER vec<3, T, defaultp> sphericalRand(T Radius)
{
T z = linearRand(T(-1), T(1));
T a = linearRand(T(0), T(6.283185307179586476925286766559f));
T theta = linearRand(T(0), T(6.283185307179586476925286766559f));
T phi = std::acos(linearRand(T(-1.0f), T(1.0f)));
T r = sqrt(T(1) - z * z);
T x = r * std::cos(a);
T y = r * std::sin(a);
T x = std::sin(phi) * std::cos(theta);
T y = std::sin(phi) * std::sin(theta);
T z = std::cos(phi);
return vec<3, T, defaultp>(x, y, z) * Radius;
}