"Kenneth" <kdw### [at] gmailcom> wrote:

> Is the technique you refer to here
> the same as Mike's 'thickening' trick using 2 parallel surfaces (page 18 of
> 149)? Or is it something different?

It is the same - yet with a slight difference.

If you're trying to make a black pattern on a white background, you're going to
want a solid black pattern, not a small gradient from -C to 0 to +C.

So you just use select to make a discontinuous function.

#declare Pattern = function {select (abs(F(x,y,z)-C, 0, 0, 1)}

And then when you do plane {z, 0, pigment {function {Pattern (x, y, z)}}}, you
get what you're probably expecting.

- BW

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