Any h-f that has not been given a pigment will not show.
Try this: pigment { gradient y color_map { [ 0 rgb .1][1 rgb 1]}}
This will at least let you see the shape of your h-f.
GRedway wrote:

> You haven't given the h-f a texture or colour. The gif may have a colour
> but I don't think these are used for the h-f object.
>
>         Graham.
>
> Chuck Roberts wrote:
> >
> > I have POV 3.1g for Win 95 and am trying to render a heightfield which
> > is a 16 color GIF. My code for it is:
> > height_field {gif "d:\progra~1\POV-ray\a-images\aztec1.gif"
> >   scale <4,4,4>
> >   translate <-2,2,0>
> >
> >   }
> >
> > But it just renders as a black rectangle. The first half of the colors
> > in the GIF are shades of "black" (i.e. real close to black). Do I need
> > to vary my colors in the color palette? Some of my colors are non-black,
> > but how come I don't see any sign of those? I also have 2 light sources
> > to make sure I see the surface of the object.
> >
> > BTW, my picture is a picture of several aztec glyphs. And I used Paint
> > Shop Pro 3.11 (for win 3.1) to save the GIF to 16 colors.

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