 Metropolis light transport

The Metropolis light transport (MLT) is a SIGGRAPH 1997 paper by Eric Veach and Leonidas J. Guibas, describing an application of a variant of the Monte Carlo method called the MetropolisHastings algorithm to the rendering equation for generating images from detailed physical descriptions of three dimensional scenes.
The procedure constructs paths from the eye to a light source using bidirectional path tracing, then constructs slight modifications to the path. Some careful statistical calculation (the Metropolis algorithm) is used to compute the appropriate distribution of brightness over the image. This procedure has the advantage, relative to bidirectional path tracing, that once a path has been found from light to eye, the algorithm can then explore nearby paths; thus difficulttofind light paths can be explored more thoroughly with the same number of simulated photons. In short, the algorithm generates a path and stores the path's 'nodes' in a list. It can then modify the path by adding extra nodes and creating a new light path. While creating this new path, the algorithm decides how many new 'nodes' to add and whether or not these new nodes will actually create a new path.
Metropolis Light Transport is an unbiased method that, in some cases (but not always), converges to a solution of the rendering equation quicker than other unbiased algorithms, path tracing and bidirectional path tracing.^{[citation needed]}
See also
 Indigo Renderer — A commercial unbiased 3D renderer that uses MLT
 Kerkythea — Another unbiased free 3D renderer that uses MLT
 Maxwell Render — A commercial unbiased renderer based on MLT
 LuxRender — An open source unbiased renderer that uses MLT
References
External links
 Metropolis project at Stanford
 LuxRender  an open source render engine that supports MLT
 Kerkythea 2008  a freeware rendering system that uses MLT
 A Practical Introduction to Metropolis Light Transport
 Unbiased physically based rendering on the GPU
Categories: Monte Carlo methods
 3D computer graphics
 Computing stubs
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