78 lines
2.4 KiB
C++
78 lines
2.4 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_RENDER_NOISE_H_)
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#define __MITSUBA_RENDER_NOISE_H_
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#include <mitsuba/mitsuba.h>
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MTS_NAMESPACE_BEGIN
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/**
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* \brief Contains a few useful noise functions
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*
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* The implementations in this class are based on PBRT
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* \ingroup librender
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* \ingroup libpython
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*/
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class MTS_EXPORT_RENDER Noise {
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public:
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/**
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* \brief Evaluate the Perlin noise function at \a p.
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*/
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static Float perlinNoise(const Point &p);
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/**
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* \brief Evaluate a fractional Brownian noise function
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* based on \ref perlinNoise() at \a p.
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*
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* \param dpdx Differential of p with respect to
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* the next horizontal pixel in screen-space.
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* \param dpdy Differential of p with respect to
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* the next vertical pixel in screen-space.
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* \param omega Controls the falloff weights applied
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* to higher-frequency octaves
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* \param maxOctaves Max. number of octaves used
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* in the noise computation
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*/
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static Float fbm(const Point &p, const Vector &dpdx,
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const Vector &dpdy, Float omega, int maxOctaves);
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/**
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* \brief Similar to \ref fbm, but adds first-derivative
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* discontinuities, causing the resulting function to have
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* infinite frequency content.
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*
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* \param dpdx Differential of p with respect to
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* the next horizontal pixel in screen-space.
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* \param dpdy Differential of p with respect to
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* the next vertical pixel in screen-space.
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* \param omega Controls the falloff weights applied
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* to higher-frequency octaves
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* \param maxOctaves Max. number of octaves used
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* in the noise computation
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*/
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static Float turbulence(const Point &p, const Vector &dpdx,
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const Vector &dpdy, Float omega, int maxOctaves);
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};
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MTS_NAMESPACE_END
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#endif /* __MITSUBA_RENDER_NOISE_H_ */
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