GPU-Accelerated Deep Shadow Maps for Direct Volume Rendering

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dc.contributor.authorHadwiger, Markusen_US
dc.contributor.authorKratz, Andreaen_US
dc.contributor.authorSigg, Christianen_US
dc.contributor.authorBühler, Katjaen_US
dc.contributor.editorMarc Olano and Philipp Slusalleken_US
dc.date.accessioned2013-10-28T10:04:56Z
dc.date.available2013-10-28T10:04:56Z
dc.date.issued2006en_US
dc.description.abstractDeep shadow maps unify the computation of volumetric and geometric shadows. For each pixel in the shadow map, a fractional visibility function is sampled, pre-filtered, and compressed as a piecewise linear function. However, the original implementation targets software-based off-line rendering. Similar previous algorithms on GPUs focus on geometric shadows and lose many important benefits of the original concept. We focus on shadows for interactive direct volume rendering, where shadow algorithms currently either compute additional per-voxel shadow data, or employ half-angle slicing to generate shadows during rendering. We adapt the original concept of deep shadow maps to volume ray-casting on GPUs, and show that it can provide anti-aliased high-quality shadows at interactive rates. Ray-casting is used for both generation of the shadow map data structure and actual rendering. High frequencies in the visibility function are captured by a pre-computed lookup table for piecewise linear segments. Direct volume rendering is performed with an additional deep shadow map lookup for each sample. Overall, we achieve interactive high-quality volume ray-casting with accurate shadows. To conclude, we briefly describe how semi-transparent geometry such as hair could be integrated as well, provided that rasterization can write to arbitrary locations in a texture. This would be a major step toward full deep shadow map functionality.en_US
dc.description.seriesinformationGraphics Hardwareen_US
dc.identifier.isbn3-905673-37-1en_US
dc.identifier.issn1727-3471en_US
dc.identifier.urihttps://doi.org/10.2312/EGGH/EGGH06/049-052en_US
dc.publisherThe Eurographics Associationen_US
dc.subjectCategories and Subject Descriptors (according to ACM CCS): I.3.3 [Computer Graphics]: Picture/Image Generation; I.3.7 [Computer Graphics]: Color, shading, shadowing, and textureen_US
dc.titleGPU-Accelerated Deep Shadow Maps for Direct Volume Renderingen_US
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EGGH06: SIGGRAPH/Eurographics Workshop on Graphics Hardware 2006