Alain <ele### [at] netscapenet> wrote:
> en ce 2008/04/19 08:21 :)   ->
> > Hi,
> > Thanks for all the nice suggestions.
> >
> >> Just start with evenly spaced points in an array. Now, apply some vturbulence to
> >> each point.
> >> Now that your points are shifted from ther original locations, just use loops to
> >> place and connect them. Your objects will be moved on all 3 axis from ther
> >> original locations.
> >
> > I think the turbulence option fits my need the best. But I'm not quite there
> > yet. Hers my preliminary code:
> >
> >
> > ############################################################################
> >
> > Maybe I don't get the parameters for vturbulence because I can't get the surface
> > to be random at larger distances while being less random at shorter distances.
> >
> > Any thoughts?
> >
> >
> >
> >
> >
> >
> Try this:
>       #declare A = <X,R,Z> + 1.5*vturbulence(1.5, 0.45, 2,<X/5,R,Z/5>)*<0,1,0>;
>
> The first argument (lambda) determine the randommness of the steps. Usual values
> range from 1 to 2. Small values mean that the steps tend to be in the same
> direction. Large values mean that the direction of a step depends less on the
> direction of the preceding setp. Float larged than zero.
>
> The second argument (omega) determine the relative weight of a step compared to
> the preceding one. Start with 0.5. Reduce for a smoother result. Float larger
> than zero up to 1.
>
> The third argument (octaves) determine how many steps are used to perturb the
> positions. Increase to get more small scale perturbation. Integer values only.
>
> By dividine X and Z by 5, I effectively spreaded the perturbations, equivalent
> to scaling the pattern by 5 horizontaly.
>
> Now, it makes smooth, irregular, ondulations.
>
> Unless you use all those includes elsewhere, you realy only use colors.inc. You
> can remove all other includes.
>
> --
> Alain
> -------------------------------------------------
> You know you've been raytracing too long when you've gained twenty pounds
> sitting at the computer, but can't tell because your beard covers your stomach.
> Taps a.k.a. Tapio Vocadlo


Thank you very much!
This is excatly what I am looking for.

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