Accelerated, High-Quality Refraction Computations for Volume Graphics 

International Workshop on Volume Graphics 2005

Shengying Li          Klaus Mueller

Stony Brook University

Figure 1: Various volume graphics renderings of refractive glass balls:
(center) the ball with one and two air holes, respectively; (left and right) the ball with no air holes and different backdrops.

Abstract:

We present an efficient framework for the high-quality render­ing of discretely sampled surface-based objects with refractive effects. This requires an accurate estimation of the refraction indi­ces, paired with efficient and accurate surface detection, space tra­versal, and backdrop image sampling. Our framework achieves these goals, by employing a high-quality spline-based filter in con­junction with a novel filtered octree space decomposition that is carefully matched to the filter characteristics. Finally, we describe an innovative scheme that achieves the high quality of pixel super­sampling on a flat backdrop plane without the overhead of tracing the actual rays across the refractive object.

      

Full Paper  (PDF file, 688 KB)

     Presentation (PPT file, 2.7 MB)

Volume rendering results:

 

Catmull-Rom Cubic

B-spline 3, smooth λ=1

 

 

Rendered result

Catmull-Rom Cubic

B-spline 3, smooth λ=1

 

Lobster

Teapot

Sphere

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lshengyi at cs.sunysb.edu, Computer Science Department, Stony Brook University, NY 11794.