Did you try  to use "evaluate" in order to find out the proper
"max_gradient"? If not, take a look at the docs, specifically 6.5.4.
Although you increased it, the ammount might still be insuficient (the
largest number I've had to use in one of my isosurfaces was 248). If it's
not that, then I don't have a clue.

BTW, nice cloud. Do you intend to post the source?

Ruy

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