"Christopher James Huff" ha scritto 
: 
: Do you bother to read the material you quote? That thread is about the 
: inside_vector feature, which lets a closed mesh be used as a solid 
: object. It has nothing to do with isosurfaces, they wouldn't be of any 
: use for this. The poster you replied to seems to have been confused, and 
: apparently didn't know about that addition. 

Well, I've been confused by the doc, in particular, 

<QUOTE>
6.5.6  Constructive Solid Geometry
...

6.5.6.1  Inside and Outside

....
You should note that triangles and triangle-based shapes cannot be used 
as solid objects in CSG since they have no well defined inside and outside.
</QUOTE>

and by the warning povray issues with the bug-report scene.

In fact, the point is that Invert_Mesh(OBJECT *) is an empty function,
so it's not possible to distinguish between intersection and 
difference (that internally is an intersection among the first object
and the "inverse" of every other object), when the mesh object is not 
the first.


:I can't even find the post 
: you replied to, though...it doesn't seem to exist except for on the web 
: interface.
: 

I don't see that message too. I replied to the last message I see in 
povray.bugreports, and cross posted to povray.programming. 

Hope that's the correct way to do.

Massimo

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