Bryan,
I have been encouraged with your cubes on the binaries forum and am 
attempting to "duplicate" your scene with dunes and mountains exactly as you 
describe.  I'd love to share anything, everything I have.

Can you add some more detail ... I am not sure what you mean when you say 
you can't get large features large enough ...

As you know, the isosurface is contained in a bounding box, surely if you 
make your bounding box tall enough, the surface will follow.  A sketch or as 
big a wordy description as possible would be great.

Neil

"Bryan Valencia" <pov### [at] spamgourmetcom> wrote in message 
news:4202a864$1@news.povray.org...
>I have been playing with this, and am having trouble with a 3
> levels-of-detail iso landscape.
>
> I'm using a marble function to do large features like canyons and 
> mountains,
> a noise function to do dunes, and a granite function to do 'grain'.
>
> The main problem I'm encountering is that I can't get large features large
> enough.  My mountains are all exactly 20 feet tall.
>
> I am really getting tired of rendering 10000x10000 images to use for 
> height
> fields. I'd love to figger this isosurface thing out.
>
> Is there a way to use a function to do something like this?
>
> - Start with f_marble
> - Scale they Y by 'distance from x=0,z=0'.  So there would be this little
> valley in the center and the mountains would be around the outside.
>
> I tried using f_myMarble(x/100,y/100,z/100)*1000 but no go.
>
> f_myMarble is the same as in 'functions.inc' but with turbulence added.
>
>

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