1- what do you mean by invisible ...
2 - did you use the contained_by or clipped by statement ...if  clipped by
statement then its 'normal'
3 - i think you probleme comes from contained box ..you should look at it if
a mistake doents occurs ..
4 - did the back of you difference exists ?






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> hello,
>
> currently I render a scene with an isosurface and a mirror showing that
isosurface.
> isosurface is created like:
> difference{
> object { isosurface1_containedby_box }
> object {
> isosurface2_containedby_box
> translate y*-value
> }
> rotate x*90
> }
> the result is a nearly planar surface.
> the mirror has reflection 0.8.
>
> but now backside of isosurface is invisible in mirror.
> I heared about keyword <<hollow>>.
> does it come in play here? if yes, where do I have to place it? what else
can I do?
>
> thanks in advance

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