diff options
| author | Lukas Stockner <lukas.stockner@freenet.de> | 2017-06-21 03:57:58 +0300 |
|---|---|---|
| committer | Lukas Stockner <lukas.stockner@freenet.de> | 2017-06-22 01:09:56 +0300 |
| commit | 1979176088047794813399baf85ff496c4fe456e (patch) | |
| tree | 7db8f8d591c1a78fd04d421f415e555f20372996 /intern/cycles/kernel/closure/bsdf_microfacet.h | |
| parent | 8cb741a598d6898328e0666c2cafddaaf9d830fd (diff) | |
Cycles: Fix excessive sampling weight of glossy Principled BSDF components
If there was any specularity in the Principled BSDF, it would get a sampling
weight of one regardless of its actual impact.
This commit makes Cycles estimate the contribution of the component and adjust
the weighting accordingly, which greatly improves the noise characteristics of
the Principled BSDF in many cases.
Note that this commit might slightly change the brightness of areas when using
MultiGGX and high roughnesses, but the new brightness is more accurate and
closer to the result of Branched Path Tracing. See T51836 for details.
Differential Revision: https://developer.blender.org/D2677
Diffstat (limited to 'intern/cycles/kernel/closure/bsdf_microfacet.h')
| -rw-r--r-- | intern/cycles/kernel/closure/bsdf_microfacet.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_microfacet.h b/intern/cycles/kernel/closure/bsdf_microfacet.h index 30cc8b90330..b12e248f0a3 100644 --- a/intern/cycles/kernel/closure/bsdf_microfacet.h +++ b/intern/cycles/kernel/closure/bsdf_microfacet.h @@ -288,12 +288,16 @@ ccl_device int bsdf_microfacet_ggx_setup(MicrofacetBsdf *bsdf) return SD_BSDF|SD_BSDF_HAS_EVAL; } -ccl_device int bsdf_microfacet_ggx_fresnel_setup(MicrofacetBsdf *bsdf) +ccl_device int bsdf_microfacet_ggx_fresnel_setup(MicrofacetBsdf *bsdf, const ShaderData *sd) { bsdf->extra->cspec0.x = saturate(bsdf->extra->cspec0.x); bsdf->extra->cspec0.y = saturate(bsdf->extra->cspec0.y); bsdf->extra->cspec0.z = saturate(bsdf->extra->cspec0.z); + float F0 = fresnel_dielectric_cos(1.0f, bsdf->ior); + float F = average(interpolate_fresnel_color(sd->I, bsdf->N, bsdf->ior, F0, bsdf->extra->cspec0)); + bsdf->sample_weight *= F; + bsdf->alpha_x = saturate(bsdf->alpha_x); bsdf->alpha_y = bsdf->alpha_x; @@ -302,12 +306,16 @@ ccl_device int bsdf_microfacet_ggx_fresnel_setup(MicrofacetBsdf *bsdf) return SD_BSDF|SD_BSDF_HAS_EVAL; } -ccl_device int bsdf_microfacet_ggx_clearcoat_setup(MicrofacetBsdf *bsdf) +ccl_device int bsdf_microfacet_ggx_clearcoat_setup(MicrofacetBsdf *bsdf, const ShaderData *sd) { bsdf->extra->cspec0.x = saturate(bsdf->extra->cspec0.x); bsdf->extra->cspec0.y = saturate(bsdf->extra->cspec0.y); bsdf->extra->cspec0.z = saturate(bsdf->extra->cspec0.z); + float F0 = fresnel_dielectric_cos(1.0f, bsdf->ior); + float F = average(interpolate_fresnel_color(sd->I, bsdf->N, bsdf->ior, F0, bsdf->extra->cspec0)); + bsdf->sample_weight *= 0.25f * bsdf->extra->clearcoat * F; + bsdf->alpha_x = saturate(bsdf->alpha_x); bsdf->alpha_y = bsdf->alpha_x; @@ -343,12 +351,16 @@ ccl_device int bsdf_microfacet_ggx_aniso_setup(MicrofacetBsdf *bsdf) return SD_BSDF|SD_BSDF_HAS_EVAL; } -ccl_device int bsdf_microfacet_ggx_aniso_fresnel_setup(MicrofacetBsdf *bsdf) +ccl_device int bsdf_microfacet_ggx_aniso_fresnel_setup(MicrofacetBsdf *bsdf, const ShaderData *sd) { bsdf->extra->cspec0.x = saturate(bsdf->extra->cspec0.x); bsdf->extra->cspec0.y = saturate(bsdf->extra->cspec0.y); bsdf->extra->cspec0.z = saturate(bsdf->extra->cspec0.z); + float F0 = fresnel_dielectric_cos(1.0f, bsdf->ior); + float F = average(interpolate_fresnel_color(sd->I, bsdf->N, bsdf->ior, F0, bsdf->extra->cspec0)); + bsdf->sample_weight *= F; + bsdf->alpha_x = saturate(bsdf->alpha_x); bsdf->alpha_y = saturate(bsdf->alpha_y); |