Ed Jackson wrote:

> On Tue, 13 May 2003 15:04:56 -0500, Bill Hails wrote:
>> 
>> The artefacts do look like a chequered floor, I think that's indicative,
>> like they appear when the ray passes an even (odd?) number of times
>> through the object?
>> 
>> 
>> 
> 
> I think you're probably on the right track... If you look at section
> 6.5.6.5 of the povray manual (about the CSG merge operation), you'll see
> the following:
> 
> "The union operation just glues objects together, it does not remove the
>  objects' surfaces inside the union. Under most circumstances this doesn't
>  matter. However if a transparent  union is used, those interior surfaces
>  will be visible. The  merge operations can be used to avoid this problem.
>  It works just like union but it eliminates the inner surfaces..."
> 
> I'm not really familiar with how media functions with container objects,
> but I wouldn't be at all surprised to find that your problem was related
> to the surfaces that weren't removed by the union, AND that it's not
> really a bug.  ;)
> 
> Good luck with it!

Thanks.

The smoke is already a merge however, not a union. The artefacts appear when
I use the smoke object within a bigger union (cigarette + smoke).

I'll try and get a test example out tonight/this weekend

> -Ed

-- 
Gee Batman, is there *anything* you don't understand?
Yes Robin, several things.

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