In article <3c7cf5cf@news.povray.org>,


> but for some of the triangles. Just ALL or NONE is less usable than a way to
> define a GROUP within a mesh. Why should have a mesh a homogenous interior
> regardless of it's structure?

Because it is a single object, and thus only has one interior.
But you are only restricted to a single interior, it does not have to be 
homogenous. Media can have its density vary according to a pattern. The 
thing that doesn't make any sense would be for individual triangles of a 
mesh to have their own interiors. This has been explained many times, 
and is for fairly obvious reasons, I don't know why you don't understand 
it.
If different parts of your object are composed of different materials, 
you should probably be using a union of several meshes.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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