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[tang <>]

Hi Zohar,

Thank you very much for your kindly reply. 

The multi-domain polyhedron I mean is the collect of surface facets to form
several watertight objects, with one or more pairs of objects share a common
interface. The following example a1.off is a multi-domain polyhedron I
defined: inside there are four small boxes and the neighboring boxes share a
common interface. I don't know whether CGAL can process this kind of
polyhedron or not (I don't know whether it is correct to define the common
interfaces of the inner objects). 

Now what I require is:
a3.off = a1.off - a2.off
final.off = a3.off + a2.off

The final.off should recognize the interface between different domains
exactly, so that duplicate surface facets is not allowed in the common
interface.

Thanks,
Tang Laoya 



// a1.off: a multiple-domain polyhedron
18 20 0
1 -2  -2
1 0   -2
1 2   -2
-2 -2 -2
-2 0  -2
-2 2  -2
1 -2   0
1 0    0
1 2    0
-2 -2  0
-2 0   0
-2 2   0
1 -2   2
1 0    2
1 2    2
-2 -2  2
-2 0   2
-2 2   2
4 0 1 7 6
4 1 2 8 7
4 6 7 13 12
4 7 8 14 13
4 2 5 11 8
4 8 11 17 14
4 4 10 11 5
4 3 9 10 4
4 9 15 16 10
4 10 16 17 11
4 0 6 9 3
4 6 12 15 9
4 0 3 4 1
4 1 4 5 2
4 12 13 16 15
4 13 14 17 16
4 6 7 10 9         /// these four facets are interfaces of inner 4
sub-domains 
4 7 8 11 10
4 7 10 16 13
4 1 4 10 7


// a2.off: a box
OFF
8 6 0
2 1 -1
2 1 1
2 -1 1
2 -1 -1
-1 1 -1
-1 1 1
-1 -1 1
-1 -1 -1
4 0 1 2 3
4 4 7 6 5
4 0 4 5 1
4 1 5 6 2
4 3 2 6 7
4 0 3 7 4





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