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[tang <>]

Hi Sebastien, 

Here is an example of one multiple-domain polyhedron (a1.off) subtracting
another polyhedron (a2.off). However, the results is empty. In fact, the
CGAL still think that a1.off is an invalid polyhedron. Could you please help
me to take a look at it and give me some clues on how to work on this issue?

Thanks,
Tang Laoya


// a1.off: a multiple-domain polyhedron
OFF
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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