Probably this should go to p.newusers, but I can't seem
to find anything in the manual.

I'm doing a simple moon - sphere, uv_mapping, image_map and bump_map:

#declare Luna = sphere {
    0, 1
    texture {
        uv_mapping
        pigment {
            image_map {
                jpeg "albedo.simp750.jpeg"
            }
        }
        normal {
            bump_map {
                jpeg "moonbump4k.jpg"
                bump_size 1.8
            }
        }
        finish {
            ambient VeryDarkBlue
            diffuse 1.0
            specular 0.1
            roughness 0.35
        }
    }
    rotate -90 * y
}

but that just doesn't cut it because at the terminator
the bump map just abruptly stops.

So I want to replace the sphere with either a height_field
(are spherical height fields possible? I can't find any
references) or an isosurface, using the bump map file as data.

I'm sure this question must have been asked a hundered
times before, so please excuse me if I've missed it,
but I can't seem to find anything relevant.

-- 
Bill Hails
http://billhails.net/

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