108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/*
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This file is part of Mitsuba, a physically based rendering system.
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Copyright (c) 2007-2012 by Wenzel Jakob and others.
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Mitsuba is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License Version 3
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as published by the Free Software Foundation.
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Mitsuba is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#if !defined(__MITSUBA_BIDIR_MUT_MANIFOLD_H_)
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#define __MITSUBA_BIDIR_MUT_MANIFOLD_H_
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#include <mitsuba/bidir/mutator.h>
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MTS_NAMESPACE_BEGIN
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#define MTS_MANIFOLD_QUANTILE_SURFACE 0.9f
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#define MTS_MANIFOLD_QUANTILE_MEDIUM 0.5f
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/**
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* \brief Specular manifold perturbation strategy
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*
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* \author Wenzel Jakob
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* \ingroup libbidir
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*/
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class MTS_EXPORT_BIDIR ManifoldPerturbation : public MutatorBase {
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public:
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/**
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* \brief Construct a new specular manifold perturbation strategy
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*
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* \param scene
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* A pointer to the underlying scene
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*
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* \param sampler
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* A sample generator
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*
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* \param pool
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* A memory pool used to allocate new path vertices and edges
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*/
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ManifoldPerturbation(const Scene *scene, Sampler *sampler,
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MemoryPool &pool,
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Float probFactor,
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bool enableOffsetManifolds,
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bool enableSpecularMedia,
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Float avgAngleChangeSurface = 0,
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Float avgAngleChangeMedium = 0);
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// =============================================================
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//! @{ \name Implementation of the Mutator interface
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EMutationType getType() const;
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Float suitability(const Path &path) const;
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bool sampleMutation(Path &source, Path &proposal,
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MutationRecord &muRec);
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Float Q(const Path &source, const Path &proposal,
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const MutationRecord &muRec) const;
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void accept(const MutationRecord &muRec);
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//! @}
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// =============================================================
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MTS_DECLARE_CLASS()
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protected:
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/// Virtual destructor
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virtual ~ManifoldPerturbation();
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/// Helper function for choosing mutation strategies
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bool sampleMutationRecord(const Path &source,
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int &a, int &b, int &c, int &step);
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Float nonspecularProbSurface(Float alpha) const;
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Float nonspecularProbMedium(Float g) const;
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Float nonspecularProb(const PathVertex *vertex) const;
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inline Float specularProb(const PathVertex *vertex) const {
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return 1 - nonspecularProb(vertex);
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}
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int getSpecularChainEnd(const Path &path, int pos, int step);
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protected:
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ref<const Scene> m_scene;
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ref<Sampler> m_sampler;
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mutable ref<SpecularManifold> m_manifold;
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MemoryPool &m_pool;
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Float m_probFactor, m_probFactor2;
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bool m_enableOffsetManifolds;
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bool m_enableSpecularMedia;
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static Float m_thetaDiffSurface;
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static Float m_thetaDiffMedium;
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static int m_thetaDiffSurfaceSamples;
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static int m_thetaDiffMediumSamples;
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static Mutex *m_thetaDiffMutex;
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};
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MTS_NAMESPACE_END
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#endif /*__MITSUBA_BIDIR_MUT_MANIFOLD_H_ */
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