"SGeier" <som### [at] somewhere com> 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
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