Christoph Hormann wrote:

> "Greg M. Johnson" wrote:
> > I think it would be wonderful if I could simply say normal{down} .
>
> I'm not sure if i understand what you mean, but have you tried slope_maps?
> Furthermore remember that normal{} only changes the normal vector but not
> the geometry.

Consider this analogy.

Many people might like to use the wrinkles pattern to describe a color map,
where one might ascribe the color "black" to where the function is 0, and
"white" where the function is 1.   Some other people might want an all-black
image. Instead of going through a color_map, they are allowed so simply say
pigment{Black}.  There are situations, mine most acute, where it would be
wonderful to say "normal{down}".  Using an analogy comparing an unideal normal
nomenclature  to pigment, we'd be forcing someone to say:

    pigment{
        gradient y  //or wrinkles
        pigment_map{
            [0 Black]
            [1 Black]
        }}

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