Illumination-Driven Opacity Modulation for Expressive Volume Rendering

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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
Using classical volume visualization, typically a couple of isosurface layers are rendered semi-transparently to show the internal structures contained in the data. However, the opacity transfer function is often difficult to specify such that all the isosurfaces are of high contrast and sufficiently perceivable. In this paper, we propose a volumerendering technique which ensures that the different layers contribute to fairly different regions of the image space. Since the overlapping between the effected regions is reduced, an outer translucent isosurface does not decrease significantly the contrast of a partially hidden inner isosurface. Therefore, the layers of the data become visually well separated. Traditional transfer functions assign color and opacity values to the voxels depending on the density and the gradient. In contrast, we assign also different illumination directions to different materials, and modulate the opacities view-dependently based on the surface normals and the directions of the light sources, which are fixed to the viewing angle. We will demonstrate that this model allows an expressive visualization of volumetric data.
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@inproceedings{
:10.2312/PE/VMV/VMV12/103-109
, booktitle = {
Vision, Modeling and Visualization
}, editor = {
Michael Goesele and Thorsten Grosch and Holger Theisel and Klaus Toennies and Bernhard Preim
}, title = {{
Illumination-Driven Opacity Modulation for Expressive Volume Rendering
}}, author = {
Csébfalvi, Balázs
and
Tóth, Balázs
and
Bruckner, Stefan
and
Gröller, Eduard
}, year = {
2012
}, publisher = {
The Eurographics Association
}, ISBN = {
978-3-905673-95-1
}, DOI = {
/10.2312/PE/VMV/VMV12/103-109
} }
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