72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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/*
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This file is part of Nori, a simple educational ray tracer
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Copyright (c) 2015 by Wenzel Jakob
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Nori 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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Nori 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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#include <nori/object.h>
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#include <nori/mesh.h>
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NORI_NAMESPACE_BEGIN
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/**
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* \brief Superclass of all emitters
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*/
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class Emitter : public NoriObject {
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public:
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//Sample Emitters without Mesh attached
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virtual Color3f samplePosition(const Point2f &s, EmitterSample& es) const {return Color3f();};
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/**
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* \brief Sample the Emiter
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*
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* \param scene Scene
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* \param p position
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* \param lp light position
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* \param ln light normal
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* \param pdf_dir direction of the PDF
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* \param sample A uniformly distributed sample on \f$[0,1]^2\f$
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*
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* \return Color value
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*/
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virtual Color3f sample(const Scene *scene, EmitterSample& es) const = 0;
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/**
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* \brief Returns the Color evaluated using the light normal and the light to interection path
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*
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* \param its light intersection
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*/
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virtual Color3f eval(const Intersection &its) const = 0;
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/**
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* \brief Returns the PDF using the light normal and the light to interection path
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* \param lti ray
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*/
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virtual float pdf(const Vector3f <i) const = 0;
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/**
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* \brief Return the type of object (i.e. Mesh/Emitter/etc.)
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* provided by this instance
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* */
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EClassType getClassType() const { return EEmitter; }
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};
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NORI_NAMESPACE_END
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