> It's simply a CSG sphere with a completely transmissive
> object inside it.  That object should be invisible, and
> is when it's outside the sphere.  But put it inside the
> sphere, and it becomes visible...

I've found the problem - it's the default "max_trace_level".

It seems that my scene needs a value of at least 7; amything less and the
inner sphere prevents the inbound rays from passing through to the back of
the hollow sphere and getting properly refracted.

Ray

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