I am trying to make a texture for my gravity well grid and I cannot seem to
get it to work. Problem 1) regular color_maps can only seem to take 64
entries in their "Blendmap".

    So I thought I would try to make an iso-surface or megapov pigment using
a similar function as my isosurface. This is where I think I will need some
help...

    What I am trying to do is make the grid lines, that used to be a simple
gradient with a high frequency. But as the slope of the isosurface reaches
the horizontal, the apparent width of the grid line becomes much wider. So I
have been trying to make my pigment get narrower as it rises. In a
color_map, I used a loop and a declining variable to describe the width of
the line but, as I said, only 64 entries and I need many more.

    So is there a good way to make a quasi-gradient in iso-surface
function-to-pigment where I can control the decrease in the section of
pigment that makes the grid line? (see pbi for example)

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