1. well, as soon as you're inside an object, you're inside
its interior. If objects overlap, so do the interior. If you're
using merge, then I'm not sure of the outcome.
2. Use "inverse" on the object, its inside becomes the
outside and vice versa.
3. Overlap them slighty. POV-Ray will treat the resulting
refraction properly. Leaving a gap will result in unwanted
side effects with refraction. If its just a very small amount,
medias shouldn't complain.

regards,
tim

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde

> I have several questions that are not independent.
>
> 1. How do interiors and CSG interact?
> 2. Is there a way to assign an "interior" to the
>     outside of an object?
> 3. How do I model a glass of apple juice
>     (two adjacent interiors) without creating
>     coincident surfaces?
>
>    Mark
>

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