Interactive Direct Volume Rendering with Many-light Methods and Transmittance Caching
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
In this paper we present an interactive global illumination method for Direct Volume Rendering (DVR) based on the many-light approach, a class of global illumination methods which gained much interest recently. We extend these methods to handle transfer function and volume density updates efficiently in order to foster ability of interactive volume exploration. Global illumination techniques accounting for all light transport phenomena are typically computationally too expensive for interactive DVR. Many-light methods represent the light transport in a volume by determining a set of virtual light sources whose direct illumination and single scattering to a view ray approximate full global illumination. Our technique reduces computation caused by transfer function changes by recomputing the contribution of these virtual lights, and rescaling or progressively updating their volumetric shadow maps and locations. We discuss these optimizations in the context of DVR and demonstrate their application to interactive rendering.
Description
@inproceedings{10.2312:PE.VMV.VMV13.195-202,
booktitle = {Vision, Modeling & Visualization},
editor = {Michael Bronstein and Jean Favre and Kai Hormann},
title = {{Interactive Direct Volume Rendering with Many-light Methods and Transmittance Caching}},
author = {Weber, Christoph and Kaplanyan, Anton S. and Stamminger, Marc and Dachsbacher, Carsten},
year = {2013},
publisher = {The Eurographics Association},
ISBN = {978-3-905674-51-4},
DOI = {10.2312/PE.VMV.VMV13.195-202}
}