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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-55708

Schlegel, Philipp; Makhinya, Maxim; Pajarola, Renato (2011). Extinction-based shading and illumination in GPU volume ray-casting. IEEE Transactions on Visualization and Computer Graphics, 17(12):1795-1802.

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Direct volume rendering has become a popular method for visualizing volumetric datasets. Even though computers are continually getting faster, it remains a challenge to incorporate sophisticated illumination models into direct volume rendering while maintaining interactive frame rates. In this paper, we present a novel approach for advanced illumination in direct volume rendering based on GPU ray-casting. Our approach features directional soft shadows taking scattering into account, ambient occlusion and color bleeding effects while achieving very competitive frame rates. In particular, multiple dynamic lights and interactive transfer function changes are fully supported. Commonly, direct volume rendering is based on a very simplified discrete version of the original volume rendering integral, including the development of the original exponential extinction into a-blending. In contrast to a-blending forming a product when sampling along a ray, the original exponential extinction coefficient is an integral and its discretization a Riemann sum. The fact that it is a sum can cleverly be exploited to implement volume lighting effects, i.e. soft directional shadows, ambient occlusion and color bleeding. We will show how this can be achieved and how it can be implemented on the GPU.


12 citations in Web of Science®
20 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:03 Faculty of Economics > Department of Informatics
Dewey Decimal Classification:000 Computer science, knowledge & systems
Deposited On:10 Feb 2012 09:42
Last Modified:05 Apr 2016 15:24
ISSN:1077-2626 (P) 1941-0506 (E)
Publisher DOI:10.1109/TVCG.2011.198
PubMed ID:22034296
Other Identification Number:merlin-id:3659

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