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Evaluating Progressive-Rendering Algorithms in Appearance Design Tasks
Nov.-Dec. 2013 (vol. 33 no. 6)
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 http://youtu.be/ck-Gevl1e9s), the source code used, and other supplementary materials.
Index Terms:
Lighting,Rendering (computer graphics),Algorithm design and analysis,Photonics,Cameras,User interfaces,Algorithm design and analysis,appearance design,progressive rendering,random path tracing,quasirandom path tracing,progressive photon mapping,virtual point lights,computer graphics
Citation:
Jiawei Ou, Ondrej Karlik, Jaroslav Krivanek, Fabio Pellacini, "Evaluating Progressive-Rendering Algorithms in Appearance Design Tasks," IEEE Computer Graphics and Applications, vol. 33, no. 6, pp. 58-68, Nov.-Dec. 2013, doi:10.1109/MCG.2012.109
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