Wasn't it Christoph Hormann who wrote:

>So it's important to say that the max_gradient value should be larger than
>the gradient *everywhere* in the container, not only near the actual
>surface.  

If the solver knew where the actual surface was, then it wouldn't need
to be told the max_gradient.

Note also that there are some functions that have regions where the
actual gradient is infinite, but you can often get away with setting a
smaller value for max_gradient.

-- 
Mike Williams
Gentleman of Leisure

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