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Cycles: slightly improve BSDF sample stratification for path tracing.

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Similar to what we did for area lights previously, this should help
preserve stratification when using multiple BSDFs in theory. Improvements
are not easily noticeable in practice though, because the number of BSDFs
is usually low. Still nice to eliminate one sampling dimension.
This commit is contained in:
Brecht Van Lommel
2017-09-14 22:56:32 +02:00
parent b3afc8917c
commit 095a01a73a
13 changed files with 79 additions and 88 deletions
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8
intern/cycles/kernel/kernel_path_volume.h
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@@ -77,7 +77,7 @@ bool kernel_path_volume_bounce(
float3 phase_omega_in;
differential3 phase_domega_in;
float phase_u, phase_v;
path_state_rng_2D(kg, state, PRNG_PHASE_U, &phase_u, &phase_v);
path_state_rng_2D(kg, state, PRNG_BSDF_U, &phase_u, &phase_v);
int label;
label = shader_volume_phase_sample(kg, sd, phase_u, phase_v, &phase_eval,
@@ -155,7 +155,7 @@ ccl_device void kernel_branched_path_volume_connect_light(
float3 tp = throughput;
/* sample position on volume segment */
float rphase = path_branched_rng_1D(kg, state->rng_hash, state, j, num_samples, PRNG_PHASE);
float rphase = path_branched_rng_1D(kg, state->rng_hash, state, j, num_samples, PRNG_PHASE_CHANNEL);
float rscatter = path_branched_rng_1D(kg, state->rng_hash, state, j, num_samples, PRNG_SCATTER_DISTANCE);
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
@@ -201,7 +201,7 @@ ccl_device void kernel_branched_path_volume_connect_light(
float3 tp = throughput;
/* sample position on volume segment */
float rphase = path_branched_rng_1D(kg, state->rng_hash, state, j, num_samples, PRNG_PHASE);
float rphase = path_branched_rng_1D(kg, state->rng_hash, state, j, num_samples, PRNG_PHASE_CHANNEL);
float rscatter = path_branched_rng_1D(kg, state->rng_hash, state, j, num_samples, PRNG_SCATTER_DISTANCE);
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
@@ -238,7 +238,7 @@ ccl_device void kernel_branched_path_volume_connect_light(
float3 tp = throughput;
/* sample position on volume segment */
float rphase = path_state_rng_1D(kg, state, PRNG_PHASE);
float rphase = path_state_rng_1D(kg, state, PRNG_PHASE_CHANNEL);
float rscatter = path_state_rng_1D(kg, state, PRNG_SCATTER_DISTANCE);
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,