Visibility sweeps for joint-hierarchical importance sampling of direct lighting for stochastic volume rendering
| Autor: | Kroes, Thomas, Eisemann, Martin, Eisemann, Elmar |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | GI '15; Proceedings of the 41st Graphics Interface Conference, Halifax (USA), 3-5 June, 2015; Authors version |
| Popis: | Proceedings of Graphics Interface 2015, Halifax, Nova Scotia, Canada, Canada, 3 - 5 June 2015, 97-104 Physically-based light transport in heterogeneous volumetric data is computationally expensive because the rendering integral (particularly visibility) has to be stochastically solved. We present a visibility estimation method in concert with an importance-sampling technique for efficient and unbiased stochastic volume rendering. Our solution relies on a joint strategy, which involves the environmental illumination and visibility inside of the volume. A major contribution of our method is a fast sweeping-plane algorithm to progressively estimate partial occlusions at discrete locations, where we store the result using an octahedral representation. We then rely on a quadtree-based hierarchy to perform a joint importance sampling. Our technique is unbiased, requires little precomputation, is highly parallelizable, and is applicable to a various volume data sets, dynamic transfer functions, and changing environmental lighting. |
| Databáze: | OpenAIRE |
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