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Recently, David Ebert came to visit my lab. Recall, that he got best paper last year for his work on non-photorealistic volume rendering. So I thought that I would implement a few of his techniques, as well as a few new ones of my own, in simian. I have a some examples of these to show you. These are from the same examples I showed him. For fun they will all be side by side comparisons. They are all of the human tooth CT.

On the left is a rendering of just the basic emission and absorption volume model.

The image on the right uses a technique I call Faux Shading, which is akin to David's Null Halos. It just modifys the transfer function so that color ramps to black proportionally to the alpha values ramping to 0. The effect is to put a black halo around features in the volume. It emphasizes edges because more black will accumulate when a "ray" just grazes a surface.