Jim Charter wrote:

> You need a light_source  and start with the default finish.  You can 
> then adjust the light_source, its angle to the hf and the finish diffuse 
> and specular parameters to get what you want ambient should be low or zero

Even so, the resulting image is probably not suitable for reusing it
as a heightfield in the sense the OP expected, because the darkest areas
are no longer of the lowest height.

So, assuming the original question is about adding detail structure
to a heightfield image, the image should probably not be rendered as
a heightfield at all, but simply a plane with an image_map + normal
pattern (or possibly an image_map layered with a function pigment).

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