GPU-accelerated deep shadow maps for direct volume rendering

Markus Hadwiger*, Andrea Kratz, Christian Sigg, Katja Bühler

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

50 Scopus citations

Abstract

Deep 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.

Original languageEnglish (US)
Title of host publicationGraphics Hardware 2006 - Eurographics Symposium Proceedings
Pages49-52
Number of pages4
DOIs
StatePublished - 2006
Externally publishedYes
EventGraphics Hardware 2006: 21st ACM SIGGRAPH/Eurographics symposium - Vienna, Austria
Duration: Sep 3 2006Sep 4 2006

Other

OtherGraphics Hardware 2006: 21st ACM SIGGRAPH/Eurographics symposium
CountryAustria
CityVienna
Period09/3/0609/4/06

ASJC Scopus subject areas

  • Hardware and Architecture
  • Computer Science Applications

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