Tom Melly wrote:
> 
> I want a band of mountains on the horizon that drop to foothills and finally
> a plane as z approaches 0.
> 
> #declare MountFunc = function {"ridgedMF" <1,5,3,1/3,50>}
> with
> function{ y + (MountFunc(x*z,0,z)*5)}  // (note the x*z)
> 
> doesn't work. While the mountains become less prounounced, the plane is at
> the level of the highest peak rather than the foothills.
> 

Try this:
function{ y - (MountFunc(x*z,0,z)*5)}

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