Here are a couple of images to illustrate the response I posted on 
povray.general to a question on using object patterns as isosurfaces.
It's just a set of merged tubes with turbulence added to try to emulate the 
style of the underground caverns from the laser scanned fly-through that was 
posted in the animations newsgroup a few weeks back. The camera is looking 
down the inside of one turbulent tube with various branches off it.

The smaller image took about half an hour to render with a max_gradient 
setting of 200.
The other uses a max_gradient of 2000, but is only a partial render because 
I gave up after 20 hours.

Regards,
Chris B.

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