Joint path sampling: image comparison

Below we demonstrate the integration of our new path sampling techniques into unidirectional path tracing, bidirectional path tracing, as well as the virtual ray lights method. We compare our results against the traditional (i.e. original) versions of these algorithms. For anisotropic media we use the Henyey-Greenstein phase function with scattering anisotropy g=0.9. In the image labels, "X-conn." refers to "X-random-decision connections", as designated in the paper. Note that each individual comparison (i.e. image pair) has been tone mapped slightly differently.

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Tip: Move the mouse over the images to compare the algorithms on specific parts of the scene.

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Unidirectional path tracing

Our (3-conn.) Traditional (0-conn.) Our (3-conn.) Traditional (0-conn.)
▲ Isotropic (top) and anisotropic (bottom) homogeneous medium, single & double scattering (path lengths 1-3), 30 min
Our (3-conn.) Traditional (0-conn.) Our (3-conn.) Traditional (0-conn.)
▲ Isotropic (top) and anisotropic (bottom) homogeneous medium, path lengths 1-8, 120 min
Our (3-conn.) Traditional (0-conn.)
▲ Anisotropic heterogeneous medium, single & double scattering (path lengths 1-3), 480 min
Our (3-conn.) Our (1-conn.) Our (3-conn.) Our (1-conn.)
▲ Anisotropic homogeneous (top) and heterogeneous (bottom) medium, single & double scattering (path lengths 1-3), 30 min

Bidirectional path tracing

Our (3-conn.) Traditional (0-conn.) Our (3-conn.) Traditional (0-conn.)
▲ Anisotropic homogeneous medium, path lengths 1-3 (top, 30min) and 1-8 (bottom, 240min)

Virtual ray lights

Our (2-conn.) Novak et al. [2012] (2-conn.) Our (3-conn.) Our (2-conn.)
▲ Anisotropic homogeneous medium, correlated (top, 10min) and uncorrelated (bottom, 2min), single & path lengths 1-3



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