chaps -

To make sure to get a good result with complex objects or high ior,
you're going to want to set max_intersections to be pretty high (like 20
or 30).  It looks like some of the black near the bottom of the
"jellyfish" is due to using the default max_intersections value of 5. 
Even without using a high ior value, a max_intersetions value too low
can cause artifacts with media, as well!

Try setting this value higher and see what happens.

- ben

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