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Fix T38710: volume render issue with transparent surfaces.

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This commit is contained in:
Brecht Van Lommel 2014-02-26 18:47:50 +01:00
parent 49e8cfd809
commit e1e247a99b
2 changed files with 10 additions and 2 deletions
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3
intern/cycles/kernel/kernel_random.h
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@ -120,6 +120,9 @@ ccl_device_inline float path_rng_1D(KernelGlobals *kg, RNG *rng, int sample, int
/* Cranly-Patterson rotation using rng seed */
float shift;
/* using the same *rng value to offset seems to give correlation issues,
* we could hash it with the dimension but this has a performance impact,
* we need to find a solution for this */
if(dimension & 1)
shift = (*rng >> 16) * (1.0f/(float)0xFFFF);
else

9
intern/cycles/kernel/kernel_volume.h
View File

@ -536,12 +536,17 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_heterogeneous(KernelGlo
ccl_device_noinline VolumeIntegrateResult kernel_volume_integrate(KernelGlobals *kg,
PathState *state, ShaderData *sd, Ray *ray, PathRadiance *L, float3 *throughput, RNG *rng)
{
/* workaround to fix correlation bug in T38710, can find better solution
* in random number generator later, for now this is done here to not impact
* performance of rendering without volumes */
RNG tmp_rng = cmj_hash(*rng, state->rng_offset);
shader_setup_from_volume(kg, sd, ray, state->bounce);
if(volume_stack_is_heterogeneous(kg, state->volume_stack))
return kernel_volume_integrate_heterogeneous(kg, state, ray, sd, L, throughput, rng);
return kernel_volume_integrate_heterogeneous(kg, state, ray, sd, L, throughput, &tmp_rng);
else
return kernel_volume_integrate_homogeneous(kg, state, ray, sd, L, throughput, rng);
return kernel_volume_integrate_homogeneous(kg, state, ray, sd, L, throughput, &tmp_rng);
}
/* Volume Stack