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Decoupling Illumination from Isosurface Generation using 4D Light Transport

Institution:
1University of Tennessee, TN, USA. dbanks@eecs.utk.edu
2Rhythm and Hues Studios
Publisher:
IEEE Trans Vis Comput Graph
Publication Date:
Nov-2009
Volume Number:
15
Issue Number:
6
Pages:
1595-1602
Citation:
IEEE Trans Vis Comput Graph. 2009 Nov-Dec;15(6):1595-602.
PubMed ID:
19834238
Keywords:
physically-based illumination, isosurface, level set, light transport
Appears in Collections:
NAC
Sponsors:
S10 RR023069/RR/NCRR NIH HHS/United States
P41 RR013218/RR/NCRR NIH HHS/United States
Generated Citation:
Banks D.C., Beason K.M. Decoupling Illumination from Isosurface Generation using 4D Light Transport. IEEE Trans Vis Comput Graph. 2009 Nov-Dec;15(6):1595-602. PMID: 19834238.
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One way to provide global illumination for the scientist who performs an interactive sweep through a 3D scalar dataset is to pre-compute global illumination, resample the radiance onto a 3D grid, then use it as a 3D texture. The basic approach of repeatedly extracting isosurfaces, illuminating them, and then building a 3D illumination grid suffers from the non-uniform sampling that arises from coupling the sampling of radiance with the sampling of isosurfaces. We demonstrate how the illumination step can be decoupled from the isosurface extraction step by illuminating the entire 3D scalar function as a 3-manifold in 4-dimensional space. By reformulating light transport in a higher dimension, one can sample a 3D volume without requiring the radiance samples to aggregate along individual isosurfaces in the pre-computed illumination grid.

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