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Green Image
Issue No. 06 - Nov.-Dec. (2013 vol. 33)
ISSN: 0272-1716
pp: 58-68
Ondrej Karlik , Charles Univ. in Prague, Prague, Czech Republic
Jaroslav Krivanek , Charles Univ. in Prague, Prague, Czech Republic
Progressive rendering is becoming a popular alternative to precomputational approaches to appearance design. However, progressive algorithms create images exhibiting visual artifacts at early stages. A user study investigated these artifacts' effects on user performance in appearance design tasks. Novice and expert subjects performed lighting and material editing tasks with four algorithms: random path tracing, quasirandom path tracing, progressive photon mapping, and virtual-point-light rendering. Both the novices and experts strongly preferred path tracing to progressive photon mapping and virtual-point-light rendering. None of the participants preferred random path tracing to quasirandom path tracing or vice versa; the same situation held between progressive photon mapping and virtual-point-light rendering. The user workflow didn’t differ significantly with the four algorithms. The Web Extras include a video showing how four progressive-rendering algorithms converged (at, the source code used, and other supplementary materials.
Lighting, Rendering (computer graphics), Algorithm design and analysis, Photonics, Cameras, User interfaces, Algorithm design and analysis

Jiawei Ou, O. Karlik, J. Krivanek and F. Pellacini, "Evaluating Progressive-Rendering Algorithms in Appearance Design Tasks," in IEEE Computer Graphics and Applications, vol. 33, no. 6, pp. 58-68, 2014.
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