@INPROCEEDINGS {Csebfalvi-2012-IOM,
author = "Bal{\'a}zs Csebfalvi and Bal{\'a}zs T{\'o}th and Stefan Bruckner and Meister Eduard Gr{\"o}ller",
title = "Illumination-Driven Opacity Modulation for Expressive Volume Rendering",
booktitle = "Proceedings of VMV 2012",
year = "2012",
pages = "103--109",
month = "nov",
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.",
pdf = "pdfs/Csebfalvi-2012-IOM.pdf",
images = "images/Csebfalvi-2012-IOM.jpg",
thumbnails = "images/Csebfalvi-2012-IOM.png",
youtube = "https://www.youtube.com/watch?v=ZvB-Vb7aa4o",
affiliation = "tuwien",
doi = "10.2312/PE/VMV/VMV12/103-109",
event = "VMV 2012",
keywords = "illustrative visualization, illumination, volume rendering",
location = "Magdeburg, Germany",
url = "//www.cg.tuwien.ac.at/research/publications/2012/Csebfalvi-2012-IOM/"
}