Christopher James Huff wrote:
> In article <40B### [at] hotmailcom>,
>  andrel <a_l### [at] hotmailcom> wrote:
> 
> 
>>I would not be surprised if there are also problems
>>if you use interior media in self intersecting objects.
> 
> 
> There are no problems with this. Since media uses intersections to 
> decide which volume a ray is in, the only requirement is a "well 
> behaved" object with no holes or stray internal surfaces.
> 
Am I correct that the 3D equivalent of the even/odd rule is used.
If I have a self intersecting object and I enter the object
again somewhere on the inside, I am supposed to be outside
again? Can I also create hollow objects by simply adding two
meshes? No need to invert the orientation of the inner surface?
That would be much faster then using differences, I guess.

I know I can simply try this myself, only with meshes you always
have a lot of boundary cases with rays exactly hitting a vertex
or a face 'horizontally', and in this case you could hit
two vertices and/or faces at the same time. So I guess asking
you is a more authoritative answer then any testing I can do myself.

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