91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/*
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This file is part of Mitsuba, a physically based rendering system.
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Copyright (c) 2007-2014 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_LENS_H_)
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#define __MITSUBA_BIDIR_MUT_LENS_H_
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#include <mitsuba/bidir/mutator.h>
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MTS_NAMESPACE_BEGIN
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/**
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* \brief Veach-style Lens subpath perturbation strategy
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*
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* This class implements a simple lens perturbation strategy
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* as described in Eric Veach's PhD thesis.
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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 LensPerturbation : public MutatorBase {
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public:
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/**
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* \brief Construct a new lens 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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* \param minJump
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* Minimum jump distance in fractional pixel coordinates
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*
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* \param coveredArea
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* Approximate fractional image plane area that is
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* reachable using the lens perturbation
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*/
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LensPerturbation(const Scene *scene, Sampler *sampler,
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MemoryPool &pool, Float minJump, Float coveredArea);
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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 ~LensPerturbation();
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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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MemoryPool &m_pool;
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Vector2 m_filmRes;
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Float m_r1, m_r2;
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Float m_logRatio;
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Float m_imagePlaneArea;
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};
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MTS_NAMESPACE_END
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#endif /*__MITSUBA_BIDIR_MUT_LENS_H_ */
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