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finished PSSMLT documentation

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Wenzel Jakob 2012-09-28 22:42:09 -04:00
parent 35df0e21ef
commit 8f25f1ee46
2 changed files with 723 additions and 8 deletions
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doc/images/integrator_pssmlt_sketch.pdf Normal file
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src/integrators/pssmlt/pssmlt.cpp
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@ -67,7 +67,7 @@ MTS_NAMESPACE_BEGIN
* number of samples. \default{\code{100000} samples} * number of samples. \default{\code{100000} samples}
* } * }
* \parameter{twoStage}{\Boolean}{Use two-stage MLT? * \parameter{twoStage}{\Boolean}{Use two-stage MLT?
* See below for details. \default{false}} * See below for details. \default{{\footnotesize\code{false}}}}
* \parameter{pLarge}{\Float}{ * \parameter{pLarge}{\Float}{
* Rate at which the implementation tries to replace the current path * Rate at which the implementation tries to replace the current path
* with a completely new one. Usually, there is little need to change * with a completely new one. Usually, there is little need to change
@ -77,7 +77,15 @@ MTS_NAMESPACE_BEGIN
* Primary Sample Space Metropolis Light Transport (PSSMLT) is a rendering * Primary Sample Space Metropolis Light Transport (PSSMLT) is a rendering
* technique developed by Kelemen et al. \cite{Kelemen2002Simple} which is * technique developed by Kelemen et al. \cite{Kelemen2002Simple} which is
* based on Markov Chain Monte Carlo (MCMC) integration. * based on Markov Chain Monte Carlo (MCMC) integration.
* * \renderings{
* \vspace{-2mm}
* \includegraphics[width=11cm]{images/integrator_pssmlt_sketch.pdf}\hfill\,
* \vspace{-3mm}
* \caption{PSSMLT piggybacks on a rendering method that can turn points
* in the primary sample space (i.e. ``random numbers'') into paths. By
* performing small jumps in primary sample space, it can explore the neighborhood
* of a path\vspace{-5mm}}
* }
* In contrast to simple methods like path tracing that render * In contrast to simple methods like path tracing that render
* images by performing a na\"ive and memoryless random search for light paths, * images by performing a na\"ive and memoryless random search for light paths,
* PSSMLT actively searches for \emph{relevant} light paths (as is the case * PSSMLT actively searches for \emph{relevant} light paths (as is the case
@ -103,8 +111,8 @@ MTS_NAMESPACE_BEGIN
* unidirectional volumetric path tracer or a fully-fledged bidirectional path * unidirectional volumetric path tracer or a fully-fledged bidirectional path
* tracer with multiple importance sampling, and this choice is controlled by the * tracer with multiple importance sampling, and this choice is controlled by the
* \code{bidirectional} flag. The unidirectional path tracer is generally * \code{bidirectional} flag. The unidirectional path tracer is generally
* much faster, but it produces lower-quality samples. * much faster, but it produces lower-quality samples. Depending on the input, either may be preferable.
* * \vspace{-7mm}
* \paragraph{Caveats:} * \paragraph{Caveats:}
* There are a few general caveats about MLT-type algorithms that are good * There are a few general caveats about MLT-type algorithms that are good
* to know. The first one is that they only render ``relative'' output images, * to know. The first one is that they only render ``relative'' output images,
@ -138,10 +146,6 @@ MTS_NAMESPACE_BEGIN
* it is preferable to disable this separation so that PSSMLT is responsible * it is preferable to disable this separation so that PSSMLT is responsible
* for everything. This can be accomplished by setting * for everything. This can be accomplished by setting
* \code{directSamples=-1}. * \code{directSamples=-1}.
*
* \remarks{
* \item This integrator does not work with dipole-style subsurface scattering models.
* }
*/ */
class PSSMLT : public Integrator { class PSSMLT : public Integrator {