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High-quality rendering of varying isosurfaces with cubic trivariate C1-continuous splines

: Kalbe, Thomas; Koch, Thomas; Goesele, Michael


Bebis, G.:
Advances in Visual Computing. 5th International Symposium, ISVC 2009. Pt.1 : Las Vegas, NV, USA, November 30 - December 2, 2009, Proceedings
Berlin: Springer, 2009 (Lecture Notes in Computer Science 5875)
ISBN: 978-3-642-10330-8
ISBN: 3-642-10330-8
ISSN: 0302-9743
International Symposium Advances in Visual Computing (ISVC) <5, 2009, Las Vegas/Nev.>
Fraunhofer IGD ()
Iso surface; Graphics Processing Unit (GPU); spline; reconstruction; ray casting; interactive visualization

Smooth trivariate splines on uniform tetrahedral partitions are well suited for high-quality visualization of isosurfaces from scalar volumetric data. We propose a novel rendering approach based on spline patches with low total degree, for which ray-isosurface intersections are computed using efficient root finding algorithms. Smoothly varying surface normals are directly extracted from the underlying spline representation. Our approach is using a combined CUDA and graphics pipeline and yields two key advantages over previous work. First, we can interactively vary the isovalues since all required processing steps are performed on the GPU. Second, we employ instancing in order to reduce shader complexity and to minimize overall memory usage. In particular, this allows to compute the spline coefficients on-the-fly in real-time on the GPU.