"Tina S." wrote:

> In playing around with isosurfaces, I had included a
> mostly-transparent box to help figure out where the edges of the
> isosurface were. I just ran into a very odd situation where if that
> box is there, my isosurface shows up, but as soon as I take it away,
> the isosurface mostly disappears, leaving only the bottom fifth or so.
>

This is very probably a max_gradient problem. It has driven many people
mad before (including me). The trick is to give a proper max_gradient
value instead of relying on eval. A detailed explanation can be found here
:
http://www.econym.demon.co.uk/isotut/keywords.htm

G.

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