2012-06-09 17:22:52 +00:00
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/*
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2013-08-18 14:16:15 +00:00
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* Copyright 2011-2013 Blender Foundation
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2012-06-09 17:22:52 +00:00
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*
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2013-08-18 14:16:15 +00:00
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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2012-06-09 17:22:52 +00:00
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*
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2013-08-18 14:16:15 +00:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2012-06-09 17:22:52 +00:00
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*
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2013-08-18 14:16:15 +00:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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2014-12-25 01:50:24 +00:00
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* limitations under the License.
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2012-06-09 17:22:52 +00:00
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*/
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2011-04-27 11:58:34 +00:00
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2012-12-15 10:18:42 +00:00
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#include "../closure/bsdf_ashikhmin_velvet.h"
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#include "../closure/bsdf_diffuse.h"
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#include "../closure/bsdf_oren_nayar.h"
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#include "../closure/bsdf_phong_ramp.h"
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#include "../closure/bsdf_diffuse_ramp.h"
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#include "../closure/bsdf_microfacet.h"
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Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
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#include "../closure/bsdf_microfacet_multi.h"
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2012-12-15 10:18:42 +00:00
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#include "../closure/bsdf_reflection.h"
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#include "../closure/bsdf_refraction.h"
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#include "../closure/bsdf_transparent.h"
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2014-06-08 10:16:28 +00:00
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#include "../closure/bsdf_ashikhmin_shirley.h"
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2013-05-23 17:45:20 +00:00
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#include "../closure/bsdf_toon.h"
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2013-09-15 23:58:00 +00:00
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#include "../closure/bsdf_hair.h"
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2013-09-04 01:04:14 +00:00
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#ifdef __SUBSURFACE__
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2016-02-12 17:33:43 +00:00
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# include "../closure/bssrdf.h"
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2013-09-04 01:04:14 +00:00
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#endif
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2013-12-29 14:40:43 +00:00
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#ifdef __VOLUME__
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2016-02-12 17:33:43 +00:00
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# include "../closure/volume.h"
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2013-12-29 14:40:43 +00:00
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#endif
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2011-04-27 11:58:34 +00:00
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CCL_NAMESPACE_BEGIN
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2016-10-02 12:48:39 +00:00
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ccl_device_forceinline int bsdf_sample(KernelGlobals *kg,
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2016-08-01 13:40:46 +00:00
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ShaderData *sd,
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const ShaderClosure *sc,
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float randu,
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float randv,
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float3 *eval,
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float3 *omega_in,
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differential3 *domega_in,
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float *pdf)
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2011-04-27 11:58:34 +00:00
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{
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2012-12-15 10:18:42 +00:00
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int label;
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switch(sc->type) {
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case CLOSURE_BSDF_DIFFUSE_ID:
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2013-08-03 13:12:09 +00:00
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case CLOSURE_BSDF_BSSRDF_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_diffuse_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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#ifdef __SVM__
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case CLOSURE_BSDF_OREN_NAYAR_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_oren_nayar_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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2016-07-25 01:03:23 +00:00
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#ifdef __OSL__
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case CLOSURE_BSDF_PHONG_RAMP_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_phong_ramp_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_diffuse_ramp_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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2016-07-25 01:03:23 +00:00
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break;
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#endif
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2012-12-15 10:18:42 +00:00
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case CLOSURE_BSDF_TRANSLUCENT_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_translucent_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_REFLECTION_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_reflection_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_REFRACTION_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_refraction_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_TRANSPARENT_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_transparent_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_MICROFACET_GGX_ID:
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2014-06-08 10:46:12 +00:00
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case CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID:
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2012-12-15 10:18:42 +00:00
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case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_microfacet_ggx_sample(kg, sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
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case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_microfacet_multi_ggx_sample(kg, sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf, &sd->lcg_state);
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Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
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break;
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case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_microfacet_multi_ggx_glass_sample(kg, sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf, &sd->lcg_state);
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Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
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break;
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2012-12-15 10:18:42 +00:00
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case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
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2014-06-08 10:46:12 +00:00
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case CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID:
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2012-12-15 10:18:42 +00:00
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case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_microfacet_beckmann_sample(kg, sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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2014-06-08 10:16:28 +00:00
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case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
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2014-06-08 10:46:12 +00:00
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case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_ashikhmin_shirley_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2014-06-08 10:16:28 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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2012-12-15 10:18:42 +00:00
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case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_ashikhmin_velvet_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2012-12-15 10:18:42 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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2013-05-23 17:45:20 +00:00
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case CLOSURE_BSDF_DIFFUSE_TOON_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_diffuse_toon_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2013-05-23 17:45:20 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_GLOSSY_TOON_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_glossy_toon_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2013-05-23 17:45:20 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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2013-09-15 23:58:00 +00:00
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case CLOSURE_BSDF_HAIR_REFLECTION_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_hair_reflection_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2013-09-15 23:58:00 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
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2017-02-16 11:24:13 +00:00
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label = bsdf_hair_transmission_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
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2013-09-15 23:58:00 +00:00
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eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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break;
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2011-04-27 11:58:34 +00:00
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#endif
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2014-01-07 14:48:04 +00:00
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#ifdef __VOLUME__
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2013-12-29 14:40:43 +00:00
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case CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID:
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2017-02-16 11:24:13 +00:00
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label = volume_henyey_greenstein_sample(sc, sd->I, sd->dI.dx, sd->dI.dy, randu, randv, eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
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2013-12-29 14:40:43 +00:00
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break;
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2014-01-07 14:48:04 +00:00
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#endif
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2012-12-15 10:18:42 +00:00
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default:
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label = LABEL_NONE;
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break;
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2011-04-27 11:58:34 +00:00
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}
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2012-12-15 10:18:42 +00:00
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return label;
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2011-04-27 11:58:34 +00:00
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}
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2016-08-05 12:45:54 +00:00
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#ifndef __KERNEL_CUDA__
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2016-08-02 13:04:34 +00:00
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ccl_device
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#else
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2016-10-02 12:48:39 +00:00
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ccl_device_forceinline
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2016-08-02 13:04:34 +00:00
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#endif
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float3 bsdf_eval(KernelGlobals *kg,
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ShaderData *sd,
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const ShaderClosure *sc,
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const float3 omega_in,
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float *pdf)
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2011-04-27 11:58:34 +00:00
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{
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2012-12-15 10:18:42 +00:00
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float3 eval;
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2017-02-16 11:24:13 +00:00
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if(dot(sd->Ng, omega_in) >= 0.0f) {
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2012-12-15 10:18:42 +00:00
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switch(sc->type) {
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case CLOSURE_BSDF_DIFFUSE_ID:
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2013-08-03 13:12:09 +00:00
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case CLOSURE_BSDF_BSSRDF_ID:
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2017-02-16 11:24:13 +00:00
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eval = bsdf_diffuse_eval_reflect(sc, sd->I, omega_in, pdf);
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2012-12-15 10:18:42 +00:00
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break;
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#ifdef __SVM__
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case CLOSURE_BSDF_OREN_NAYAR_ID:
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2017-02-16 11:24:13 +00:00
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eval = bsdf_oren_nayar_eval_reflect(sc, sd->I, omega_in, pdf);
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2012-12-15 10:18:42 +00:00
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break;
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2016-07-25 01:03:23 +00:00
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#ifdef __OSL__
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case CLOSURE_BSDF_PHONG_RAMP_ID:
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2017-02-16 11:24:13 +00:00
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eval = bsdf_phong_ramp_eval_reflect(sc, sd->I, omega_in, pdf);
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2012-12-15 10:18:42 +00:00
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break;
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case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
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2017-02-16 11:24:13 +00:00
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eval = bsdf_diffuse_ramp_eval_reflect(sc, sd->I, omega_in, pdf);
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2016-07-25 01:03:23 +00:00
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break;
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#endif
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2012-12-15 10:18:42 +00:00
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|
|
case CLOSURE_BSDF_TRANSLUCENT_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_translucent_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_REFLECTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_reflection_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_REFRACTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_refraction_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_TRANSPARENT_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_transparent_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID:
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_ggx_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_multi_ggx_eval_reflect(sc, sd->I, omega_in, pdf, &sd->lcg_state);
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_multi_ggx_glass_eval_reflect(sc, sd->I, omega_in, pdf, &sd->lcg_state);
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID:
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_beckmann_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
2014-06-08 10:16:28 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_ashikhmin_shirley_eval_reflect(sc, sd->I, omega_in, pdf);
|
2014-06-08 10:16:28 +00:00
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_ashikhmin_velvet_eval_reflect(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
2013-05-23 17:45:20 +00:00
|
|
|
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_diffuse_toon_eval_reflect(sc, sd->I, omega_in, pdf);
|
2013-05-23 17:45:20 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_GLOSSY_TOON_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_glossy_toon_eval_reflect(sc, sd->I, omega_in, pdf);
|
2013-05-23 17:45:20 +00:00
|
|
|
break;
|
2013-09-15 23:58:00 +00:00
|
|
|
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_hair_reflection_eval_reflect(sc, sd->I, omega_in, pdf);
|
2013-09-15 23:58:00 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_hair_transmission_eval_reflect(sc, sd->I, omega_in, pdf);
|
2013-09-15 23:58:00 +00:00
|
|
|
break;
|
2013-12-29 14:40:43 +00:00
|
|
|
#endif
|
|
|
|
#ifdef __VOLUME__
|
|
|
|
case CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = volume_henyey_greenstein_eval_phase(sc, sd->I, omega_in, pdf);
|
2013-12-29 14:40:43 +00:00
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
eval = make_float3(0.0f, 0.0f, 0.0f);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
switch(sc->type) {
|
|
|
|
case CLOSURE_BSDF_DIFFUSE_ID:
|
2013-08-03 13:12:09 +00:00
|
|
|
case CLOSURE_BSDF_BSSRDF_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_diffuse_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
#ifdef __SVM__
|
|
|
|
case CLOSURE_BSDF_OREN_NAYAR_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_oren_nayar_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_TRANSLUCENT_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_translucent_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_REFLECTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_reflection_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_REFRACTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_refraction_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_TRANSPARENT_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_transparent_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID:
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_ggx_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_multi_ggx_eval_transmit(sc, sd->I, omega_in, pdf, &sd->lcg_state);
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_multi_ggx_glass_eval_transmit(sc, sd->I, omega_in, pdf, &sd->lcg_state);
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID:
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_microfacet_beckmann_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
2014-06-08 10:16:28 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_ashikhmin_shirley_eval_transmit(sc, sd->I, omega_in, pdf);
|
2014-06-08 10:16:28 +00:00
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_ashikhmin_velvet_eval_transmit(sc, sd->I, omega_in, pdf);
|
2012-12-15 10:18:42 +00:00
|
|
|
break;
|
2013-05-23 17:45:20 +00:00
|
|
|
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_diffuse_toon_eval_transmit(sc, sd->I, omega_in, pdf);
|
2013-05-23 17:45:20 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_GLOSSY_TOON_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_glossy_toon_eval_transmit(sc, sd->I, omega_in, pdf);
|
2013-05-23 17:45:20 +00:00
|
|
|
break;
|
2013-09-15 23:58:00 +00:00
|
|
|
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_hair_reflection_eval_transmit(sc, sd->I, omega_in, pdf);
|
2013-09-15 23:58:00 +00:00
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = bsdf_hair_transmission_eval_transmit(sc, sd->I, omega_in, pdf);
|
2013-09-15 23:58:00 +00:00
|
|
|
break;
|
2013-12-29 14:40:43 +00:00
|
|
|
#endif
|
|
|
|
#ifdef __VOLUME__
|
|
|
|
case CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID:
|
2017-02-16 11:24:13 +00:00
|
|
|
eval = volume_henyey_greenstein_eval_phase(sc, sd->I, omega_in, pdf);
|
2013-12-29 14:40:43 +00:00
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
eval = make_float3(0.0f, 0.0f, 0.0f);
|
|
|
|
break;
|
|
|
|
}
|
2011-04-27 11:58:34 +00:00
|
|
|
}
|
|
|
|
|
2012-12-15 10:18:42 +00:00
|
|
|
return eval;
|
2011-04-27 11:58:34 +00:00
|
|
|
}
|
|
|
|
|
2013-11-15 23:17:10 +00:00
|
|
|
ccl_device void bsdf_blur(KernelGlobals *kg, ShaderClosure *sc, float roughness)
|
2011-04-27 11:58:34 +00:00
|
|
|
{
|
2016-07-25 01:03:23 +00:00
|
|
|
/* ToDo: do we want to blur volume closures? */
|
2012-12-15 10:18:42 +00:00
|
|
|
#ifdef __SVM__
|
2015-02-17 12:43:12 +00:00
|
|
|
switch(sc->type) {
|
Cycles: Add multi-scattering, energy-conserving GGX as an option to the Glossy, Anisotropic and Glass BSDFs
This commit adds a new distribution to the Glossy, Anisotropic and Glass BSDFs that implements the
multiple-scattering microfacet model described in the paper "Multiple-Scattering Microfacet BSDFs with the Smith Model".
Essentially, the improvement is that unlike classical GGX, which only models single scattering and assumes
the contribution of multiple bounces to be zero, this new model performs a random walk on the microsurface until
the ray leaves it again, which ensures perfect energy conservation.
In practise, this means that the "darkening problem" - GGX materials becoming darker with increasing
roughness - is solved in a physically correct and efficient way.
The downside of this model is that it has no (known) analytic expression for evalation. However, it can be
evaluated stochastically, and although the correct PDF isn't known either, the properties of MIS and the
balance heuristic guarantee an unbiased result at the cost of slightly higher noise.
Reviewers: dingto, #cycles, brecht
Reviewed By: dingto, #cycles, brecht
Subscribers: bliblubli, ace_dragon, gregzaal, brecht, harvester, dingto, marcog, swerner, jtheninja, Blendify, nutel
Differential Revision: https://developer.blender.org/D2002
2016-06-23 20:56:43 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
|
|
|
|
bsdf_microfacet_multi_ggx_blur(sc, roughness);
|
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID:
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
|
|
|
|
bsdf_microfacet_ggx_blur(sc, roughness);
|
|
|
|
break;
|
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID:
|
2012-12-15 10:18:42 +00:00
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
|
|
|
|
bsdf_microfacet_beckmann_blur(sc, roughness);
|
|
|
|
break;
|
2014-06-08 10:16:28 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
|
2014-06-08 10:46:12 +00:00
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID:
|
2014-06-08 10:16:28 +00:00
|
|
|
bsdf_ashikhmin_shirley_blur(sc, roughness);
|
|
|
|
break;
|
2012-12-15 10:18:42 +00:00
|
|
|
default:
|
|
|
|
break;
|
2011-04-27 11:58:34 +00:00
|
|
|
}
|
2015-02-17 12:43:12 +00:00
|
|
|
#endif
|
2011-04-27 11:58:34 +00:00
|
|
|
}
|
|
|
|
|
2016-07-25 01:03:23 +00:00
|
|
|
ccl_device bool bsdf_merge(ShaderClosure *a, ShaderClosure *b)
|
|
|
|
{
|
|
|
|
#ifdef __SVM__
|
|
|
|
switch(a->type) {
|
|
|
|
case CLOSURE_BSDF_TRANSPARENT_ID:
|
|
|
|
return true;
|
|
|
|
case CLOSURE_BSDF_DIFFUSE_ID:
|
|
|
|
case CLOSURE_BSDF_BSSRDF_ID:
|
|
|
|
case CLOSURE_BSDF_TRANSLUCENT_ID:
|
|
|
|
return bsdf_diffuse_merge(a, b);
|
|
|
|
case CLOSURE_BSDF_OREN_NAYAR_ID:
|
|
|
|
return bsdf_oren_nayar_merge(a, b);
|
|
|
|
case CLOSURE_BSDF_REFLECTION_ID:
|
|
|
|
case CLOSURE_BSDF_REFRACTION_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID:
|
|
|
|
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
|
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
|
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID:
|
|
|
|
return bsdf_microfacet_merge(a, b);
|
|
|
|
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
|
|
|
|
return bsdf_ashikhmin_velvet_merge(a, b);
|
|
|
|
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
|
|
|
|
case CLOSURE_BSDF_GLOSSY_TOON_ID:
|
|
|
|
return bsdf_toon_merge(a, b);
|
|
|
|
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
|
|
|
|
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
|
|
|
|
return bsdf_hair_merge(a, b);
|
|
|
|
#ifdef __VOLUME__
|
|
|
|
case CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID:
|
|
|
|
return volume_henyey_greenstein_merge(a, b);
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
return false;
|
|
|
|
}
|
2016-09-28 15:03:42 +00:00
|
|
|
#else
|
|
|
|
return false;
|
2016-07-25 01:03:23 +00:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2011-04-27 11:58:34 +00:00
|
|
|
CCL_NAMESPACE_END
|
|
|
|
|