46c4f5c4$1@news.povray.org...
> You can use a very large, possibly flatened sphere. This will make it 
> gently curve down from the center.
> For example:
> sphere{0, 10000 scale<5,0.01,5> translate -100*y}
>
> It's possible to use an isosurface to do the same, with the benefit that 
> you can alter the actual shape, but with a slower rendering speed.
>
An other easy alternative, now that k1s3k1 has understood height_fields is 
to use a 2nd one made from a image created by POVRay.
It is sometimes easy to use the procedural textures to create images for 
height_fields.
I post 2 small example files in povray.binaries.scene-files (see topic 
"Rocky ground")

Marc

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