>>> Good idea, but make sure to set max_trace_level so you don't get 
>>> infinite internal reflection.
>>
>>   When have you got infinite internal reflection?
>>
> Hrm, never actually gotten it myself, but I've seen opposed mirrors create 
> a lot of bounces and slow down rendering. If the exact center of this 
> scene is sold, I guess it wouldn't be a problem, but if the object has any 
> transparency I'd be worried about getting another reflection of the back 
> side of it.

There was a bug in beta 34 that stalled some renders, it's fixed in beta 35.
If you have a hall of mirrors (HoM) effect, POV will color some
pixels black where they aren't reached before max_trace_level.
The default max_trace_level is only 10 bounces,
so stalling shouldn't be an issue.

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