my dear flickr, vimeo and skype buddy Marcus Wendt made me curious about Raycasting so this is a very first try of Raycasting in GLSL. For the Data volume I simply used some 3D perlin noise. I think this method is really promising, since it is a lot easier to implement than marching cubes in my opinion and should have better realtime possibilities on up to date GPUs (which I don't really have right now).
I will propably work on this idea a little more serious when Macs snowleopard and OpenCL will be released.

this tutorial and a few papers I found online was really helpful:
daimi.au.dk/~trier/?page_id=98

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