Jim Holsenback <jho### [at] povrayorg> wrote:
> On 05/18/2011 06:55 AM, Thorsten Froehlich wrote:
> > "SGeier"<som### [at] somewherecom>  wrote:
> >>    isosurface{function{ sqrt(x*x+y*y+z*z) }
> >>          threshold 2 max_gradient 100 contained_by{ box {-5 5} }
> >>       //     clipped_by { clipper }
> >>            pigment {rgb 1}
> >>          }
> >>
> >> In steps (2) and (3) I see the exact same thing that I see with the sphere
> >> object. In particular I can see the shadow on step (3) that tells me that I
> >> can see the inside/backside of the isosurface.
> >>
> >> But in step 4, the back/inside of the isosurface is gone.
> >>
> >> Why?
> >
> > Because you did not read the manual.
> >
> > See http://www.povray.org/documentation/view/3.6.1/300/
> >
> > Thorsten
> >
> >
> >
> hmmm ... I didn't spot the clue. I'm tempted to say the use of or size
> clipper ... care to offer another hint ;-)

The hint about CSG and isosurfaces is at the very end of that page ;-)

Thorsten

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