Nicolas George nous apporta ses lumieres en ce 22-12-2006 06:02:
> "Slime"  wrote in message <458b94d1$1@news.povray.org>:
>> But those coincident surfaces are on the *inside*, which shouldn't be a
>> problem... or do you need this to be transparent?

> Yes. Or hollow sometimes.

>> If so, making the cylinders overlap should still be an option - just do it
>> only a tiny, tiny bit, so that you can't see it at any reasonable resolution
>> but the coincident surface is elliminated.

> That is always a possibility, but approximations like that my stomach curl.
> And even with very tiny overlap, there are always one or two rays that
> arrive just at the bad place and get a strange color.
You can cut the cylinders with planes that are not parallel. Make the cutting 
planes 44 degrees from the axis of the cylinders. That way, the cylinders will 
overlap but the tips will converge to a single point. You still have some 
coincident area, but it's a single point. Merge the two pieces.

-- 
Alain
-------------------------------------------------
Experience hath shewn, that even under the best forms of government those
entrusted with power have, in time, and by slow operations, perverted it
into tyranny.
Thomas Jefferson

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