Howdoya  turbulate?

Lummox JR wrote:

> These trees would look just great in a background, I think; not as good
> in the foreground, though.
> Two small suggestions:
>
> 1) Turbulate the x, y, and z values just slightly based on their
> distance from the center. This will give the trees a less hemispherical
> look.
> 2) Change all n^2 to sqr(n) and n^0.5 to sqrt(n). As far as I can tell
> from the function code, these should always be faster than using an
> exponent.
>
> I think I might give this a try in an old scene (where I wanted
> background trees but settled for a textured height field) and see what
> happens.
>
> Lummox JR

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I like the look of this.  I don't know anything about isosurfaces,
but I'll have a play with the code. 
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In article <38debe2c@news.povray.org>, "Greg M. Johnson" 
<"gregj;-)56590\""@aol.c;-)om> wrote:

> Howdoya  turbulate?

You could turbulate an isosurface object by using it's function in a 
pigment function, and using the pigment function for the actual 
isosurface.

#declare TreeFn =
function {
    pigment {function {...}// use the tree function as pigment pattern
        color_map {[0 rgb 0][1 rgb 1]}
        warp {
            turbulence 0.35
        }
    }
}

isosurface {
    function {TreeFn(x,y,z)}
    ...

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