118 lines
3.1 KiB
C++
118 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) 2007-2011 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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#include <mitsuba/render/bsdf.h>
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MTS_NAMESPACE_BEGIN
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/**
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* Ideal transparent BRDF
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*/
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class Transparent : public BSDF {
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public:
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Transparent(const Properties &props)
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: BSDF(props) {
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m_transmission = props.getSpectrum("transmission", Spectrum(0.8f));
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m_componentCount = 1;
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m_type = new unsigned int[m_componentCount];
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m_combinedType = m_type[0] = EDeltaTransmission | EFrontSide | EBackSide;
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m_usesRayDifferentials = false;
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}
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Transparent(Stream *stream, InstanceManager *manager)
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: BSDF(stream, manager) {
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m_transmission = Spectrum(stream);
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m_componentCount = 1;
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m_type = new unsigned int[m_componentCount];
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m_type[0] = EDeltaTransmission;
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m_combinedType = m_type[0] = EDeltaTransmission | EFrontSide | EBackSide;
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m_usesRayDifferentials = false;
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}
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virtual ~Transparent() {
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delete[] m_type;
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}
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void serialize(Stream *stream, InstanceManager *manager) const {
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BSDF::serialize(stream, manager);
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m_transmission.serialize(stream);
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}
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Spectrum getDiffuseReflectance(const Intersection &its) const {
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return Spectrum(0.0f);
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}
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Spectrum f(const BSDFQueryRecord &bRec) const {
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return Spectrum(0.0f);
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}
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Float pdf(const BSDFQueryRecord &bRec) const {
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return 0.0f;
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}
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inline void transmit(const Vector &wi, Vector &wo) const {
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wo = Vector(-wi.x, -wi.y, -wi.z);
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}
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Spectrum sample(BSDFQueryRecord &bRec, const Point2 &sample) const {
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if (!(bRec.typeMask & m_combinedType))
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return Spectrum(0.0f);
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transmit(bRec.wi, bRec.wo);
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bRec.sampledComponent = 0;
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bRec.sampledType = EDeltaTransmission;
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return m_transmission /
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std::abs(Frame::cosTheta(bRec.wo));
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}
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Spectrum sample(BSDFQueryRecord &bRec, Float &pdf, const Point2 &sample) const {
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if (!(bRec.typeMask & m_combinedType))
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return Spectrum(0.0f);
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transmit(bRec.wi, bRec.wo);
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bRec.sampledComponent = 0;
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bRec.sampledType = EDeltaTransmission;
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pdf = std::abs(Frame::cosTheta(bRec.wo));
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return m_transmission;
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}
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Float pdfDelta(const BSDFQueryRecord &bRec) const {
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return std::abs(Frame::cosTheta(bRec.wo));
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}
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Spectrum fDelta(const BSDFQueryRecord &bRec) const {
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return m_transmission;
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}
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std::string toString() const {
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std::ostringstream oss;
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oss << "Transparent[" << endl
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<< " transmission = " << m_transmission.toString() << endl
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<< "]";
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return oss.str();
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}
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MTS_DECLARE_CLASS()
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protected:
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Spectrum m_transmission;
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};
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MTS_IMPLEMENT_CLASS_S(Transparent, false, BSDF)
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MTS_EXPORT_PLUGIN(Transparent, "Transparent BSDF");
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MTS_NAMESPACE_END
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