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Cycles: Fix for a division by zero that could happen with solid angle triangle light sampling

This commit is contained in:
Stefan Werner 2017-08-17 15:05:48 +02:00
parent 743bacaa6f
commit 7a4696197d
1 changed files with 5 additions and 1 deletions
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6
intern/cycles/kernel/kernel_light.h
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@ -954,7 +954,11 @@ ccl_device_forceinline void triangle_light_sample(KernelGlobals *kg, int prim, i
const float3 U = safe_normalize(C - dot(C, A) * A);
const float q = ((v * t - u * s) * cos_alpha - v) / ((v * s + u * t) * sin_alpha);
float q = 1.0f;
const float det = ((v * s + u * t) * sin_alpha);
if(det != 0.0f) {
q = ((v * t - u * s) * cos_alpha - v) / det;
}
const float temp = max(1.0f - q*q, 0.0f);
const float3 C_ = safe_normalize(q * A + sqrtf(temp) * U);