In article <3A599631.FFE03888@atosorigin.com>, Jerome Grimbert 
<jer### [at] atosorigincom> wrote:

> It has already been done... but not in the official 3.1g
> Please have a look about SHEET (or BAND ?) in some unofficial version.
> It is exactly what it does.

There are two patterns..."sheet" and "banded". The "sheet" pattern uses:

  value = EPoint[X]*TPat->Vals.Gradient[X]
        + EPoint[Y]*TPat->Vals.Gradient[Y]
        + EPoint[Z]*TPat->Vals.Gradient[Z];

  return(value>1.0 ? 1.0 : (value<0.0? 0.0:value));

which looks like what he wants. The "banded" pattern is the same as 
gradient, except it doesn't mirror around the origin, and the bands are 
always the same length.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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