> Try 'interpolate 4'.  IIRC interpolate 2 does not lead to a continuous
> function, therefore the high gradient.


interpolate 2 does lead to a continuous function. It doesn't have a
continuous derivative, but it is continuous, so there should be no infinite
max gadient.

Perhaps the high gradient is appearing at the very edge of the image? Check
that your isosurface's contained_by box doesn't exceed the edges of the
image.

Seeing the code may help, also... and perhaps the image too if that doesn't.

 - Slime
[ http://www.slimeland.com/ ]

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