Oops I made a mistake, it was in the hieghtfield
Demo and here is the part that I cannot find from the
documentation:
Now we add the height field. In the following syntax,
a Targa image file is specified, the height field is
smoothed, it is given a simple white pigment, it is
translated to center it around the origin and it is
scaled so that it resembles mountains and
fills the screen.

height_field {

tga "image.tga"

smooth

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