diff options
| author | Brecht Van Lommel <brechtvanlommel@gmail.com> | 2017-09-14 23:56:32 +0300 |
|---|---|---|
| committer | Brecht Van Lommel <brechtvanlommel@gmail.com> | 2017-09-20 20:38:08 +0300 |
| commit | 095a01a73a35d3af57573fc724d381bcca019f54 (patch) | |
| tree | 3f22c746d1e9ae75365ade400ca08e0ae255788e /intern/cycles/kernel/kernel_volume.h | |
| parent | b3afc8917cdeaa98ebfa3f2aa17e8c5a69fdb1e3 (diff) | |
Cycles: slightly improve BSDF sample stratification for path tracing.
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.
Diffstat (limited to 'intern/cycles/kernel/kernel_volume.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_volume.h | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/intern/cycles/kernel/kernel_volume.h b/intern/cycles/kernel/kernel_volume.h index bdaba2e2e4b..d9c310a893e 100644 --- a/intern/cycles/kernel/kernel_volume.h +++ b/intern/cycles/kernel/kernel_volume.h @@ -379,9 +379,8 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_homogeneous( /* pick random color channel, we use the Veach one-sample * model with balance heuristic for the channels */ - float rphase = path_state_rng_1D(kg, state, PRNG_PHASE); + float rphase = path_state_rng_1D(kg, state, PRNG_PHASE_CHANNEL); int channel = (int)(rphase*3.0f); - sd->randb_closure = rphase*3.0f - channel; /* decide if we will hit or miss */ bool scatter = true; @@ -484,9 +483,8 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_heterogeneous_distance( /* pick random color channel, we use the Veach one-sample * model with balance heuristic for the channels */ float xi = path_state_rng_1D(kg, state, PRNG_SCATTER_DISTANCE); - float rphase = path_state_rng_1D(kg, state, PRNG_PHASE); + float rphase = path_state_rng_1D(kg, state, PRNG_PHASE_CHANNEL); int channel = (int)(rphase*3.0f); - sd->randb_closure = rphase*3.0f - channel; bool has_scatter = false; for(int i = 0; i < max_steps; i++) { @@ -843,7 +841,6 @@ ccl_device VolumeIntegrateResult kernel_volume_decoupled_scatter( /* pick random color channel, we use the Veach one-sample * model with balance heuristic for the channels */ int channel = (int)(rphase*3.0f); - sd->randb_closure = rphase*3.0f - channel; float xi = rscatter; /* probabilistic scattering decision based on transmittance */ |