I realize that the default isosurface max_gradient is at fault for the
contour lines when creating the hf_gray_16 test image.  However, even when
using the suggested max_gradient of 2.187 there was a single dot of white
amidst the otherwise okay pattern when using noise_generator 3.  Type 1 is
of course filled with plateaus and type 2 was okay.

I was under the impression that now max_gradient was found and used without
intervention.

Anyway, that isn't the main concern I had.  It's the mosaic produced from
the hf_gray_16 image when used in a isosurface.  The image being output is
always nothing but noise instead of smooth pattern (oh yeah, please ignore
that ppm image unless it means anything.  I just put that in to try it too).
I thought this was fixed as of beta 8, otherwise I wouldn't have posted
about it.

Thanks for checking this out if you have done so.

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