I tried:

 isosurface {
     function { f_rounded_box(x,y,z,0,1,1,1) - f_noise3d(x, y, z)* 0.25 }
     contained_by { box { -1 , 1} }
     pigment{Red}
     scale 0.2
 }

but this yields a perfectly square box.  No roughness at all.  Would the
max_gradient make or break this?



"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3C9CB5CA.CA4992BB@gmx.de...
>
>
> Patrick Dugan wrote:
> >
> > That type would certainly be close. I am looking for a more "slate
> > like"/"platey" appearance but that might get me started.
> > Can you be more specific about the function?  I have tried the function
but
> > simply end up with a "rounded box." I tried:
> >
> >   isosurface {
> >      function {f_rounded_box(x,y,z, 0.25, 0.25, 0.25, 0.25) }
> >      pigment{Red}
> >      scale 0.5
> >   }
> >
> > I'm no math whiz so I'm really not certain what the last four values
should
> > really be.  I've tried various values but always end up with a simple
> > rounded box.  How do you get yours to look so randomish?  I even tried
using
> > [...]
>
> When looking for 'f_rounded_box' in the docs you get:
>
> f_rounded_box(x,y,z, P0, P1, P2, P3).
> The Rounded Box is defined in a cube from <-1, -1, -1> to <1, 1, 1>.
> By changing the " Scale" parameters, the size can be adjusted,
> without affecting the Radius of curvature.
>
> P0 : Radius of curvature. Zero gives square corners, 0.1 gives corners
> that match "sphere {0, 0.1}"
> P1 : Scale x
> P2 : Scale y
> P3 : Scale z
>
> If you add/subtract a noise function to the box this should probably
> achieve what you want, something like:
>
> f_rounded_box(...) - f_noise3d(x, y, z)*0.2
>
> (see docs section 3.6.3.6)
>
> And you should add an appropriate container and max_gradient to the
> isosurface.
>
> Christoph
>
> --
> POV-Ray tutorials, IsoWood include,
> TransSkin and more: http://www.tu-bs.de/~y0013390/
> Last updated 18 Mar. 2002 _____./\/^>_*_<^\/\.______

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