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Advanced Volume Illumination with Unconstrained Light Source Positioning
November/December 2010 (vol. 30 no. 6)
pp. 29-41
Timo Ropinski, University of Münster, Münster
Christian Döring, European Institute of Molecular Imaging, Münster
Christof Rezk-Salama, Univ. Siegen, Siegen
Advanced illumination models can support depth perception. However, for volume rendering, gradient-based shading models are still the standard. This is because the computation of more advanced lighting effects is expensive and thus strongly affects rendering performance. Nevertheless, interactive frame rates are important for both the interactive design of visual representations and the exploration process. An interactive volumetric lighting model simulates scattering and shadowing to generate high-quality images. Compared to gradient-based shading, this model achieves superior image quality and higher frame rates. To evaluate this model, a user study had participants perform depth perception tasks. The study's results indicate that this model can significantly improve depth perception, compared to conventional gradient-based volume shading. Additionally, because this model isn't based on a gradient computation, it's less sensitive to noise and therefore applicable to imaging modalities suffering from a low signal-to-noise ratio, such as magnetic resonance imaging or 3D ultrasound.

1. M.S. Langer and H.H. Bülthoff, "Depth Discrimination from Shading under Diffuse Lighting," Perception, vol. 29, no. 6, 2000, pp. 649–660.
2. D. Dalby, Biological Illustration: A Guide to Drawing for Reproduction, Field Studies Council, 1980.
3. J. Sun and P. Perona, "Where Is the Sun?" Nature Neuroscience, vol. 1, 1998, pp. 183–184.
4. L. Wanger, "The Effect of Shadow Quality on the Perception of Spatial Relationships in Computer Generated Imagery," Proc. 1992 Symp. Interactive 3D Graphics (SI3D 92), ACM Press, 1992, pp. 39–42.
5. N. Max, "Optical Models for Direct Volume Rendering," IEEE Trans. Visualization and Computer Graphics, vol. 1, no. 2, 1995, pp. 99–108.
6. J. Kniss et al., "A Model for Volume Lighting and Modeling," IEEE Trans. Visualization and Computer Graphics, vol. 9, no. 2, 2003, pp. 150–162.
7. U. Behrens and R. Ratering, "Adding Shadows to a Texture-Based Volume Renderer," Proc. IEEE Int'l Symp. Volume Visualization, IEEE Press, 1998, pp. 39–46.

Index Terms:
3D graphics, realism, color, shading, shadowing, texture, computer graphics, graphics and multimedia
Citation:
Timo Ropinski, Christian Döring, Christof Rezk-Salama, "Advanced Volume Illumination with Unconstrained Light Source Positioning," IEEE Computer Graphics and Applications, vol. 30, no. 6, pp. 29-41, Nov.-Dec. 2010, doi:10.1109/MCG.2010.98
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