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Cycles: add rejection of inf/nan samples, in principle these should not happen

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but this makes it more reliable for now.

Also add an integrator "Clamp" option, to clamp very light samples to a maximum
value. This will reduce accuracy but may help reducing noise and speed up
convergence.
This commit is contained in:
Brecht Van Lommel
2012-04-05 15:17:45 +00:00
parent 5d0bfc0325
commit 6e93e33294
8 changed files with 72 additions and 2 deletions
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44
intern/cycles/kernel/kernel_accumulate.h
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@@ -294,5 +294,49 @@ __device_inline float3 path_radiance_sum(PathRadiance *L)
#endif
}
__device_inline void path_radiance_clamp(PathRadiance *L, float3 *L_sum, float clamp)
{
float sum = fabsf(L_sum->x) + fabsf(L_sum->y) + fabsf(L_sum->z);
if(!isfinite(sum)) {
/* invalid value, reject */
*L_sum = make_float3(0.0f, 0.0f, 0.0f);
#ifdef __PASSES__
if(L->use_light_pass) {
L->direct_diffuse = make_float3(0.0f, 0.0f, 0.0f);
L->direct_glossy = make_float3(0.0f, 0.0f, 0.0f);
L->direct_transmission = make_float3(0.0f, 0.0f, 0.0f);
L->indirect_diffuse = make_float3(0.0f, 0.0f, 0.0f);
L->indirect_glossy = make_float3(0.0f, 0.0f, 0.0f);
L->indirect_transmission = make_float3(0.0f, 0.0f, 0.0f);
L->emission = make_float3(0.0f, 0.0f, 0.0f);
}
#endif
}
else if(sum > clamp) {
/* value to high, scale down */
float scale = clamp/sum;
*L_sum *= scale;
#ifdef __PASSES__
if(L->use_light_pass) {
L->direct_diffuse *= scale;
L->direct_glossy *= scale;
L->direct_transmission *= scale;
L->indirect_diffuse *= scale;
L->indirect_glossy *= scale;
L->indirect_transmission *= scale;
L->emission *= scale;
}
#endif
}
}
CCL_NAMESPACE_END