Duplicated nodes not cleared? #55

Dear all,

I run the intersect by the following command:
intersect aa.ply A_MINUS_B bb.ply >cc.ply

The program gave error message:
uncontained hole loop does not share vertices with any face loop!
uncontained hole loop does not share vertices with any face loop!
uncontained hole loop does not share vertices with any face loop!
uncontained hole loop does not share vertices with any face loop!

After checked the output result cc.ply, I found that there are several 
duplicated nodes. Is there any bug?

Thanks,
Tang Laoya


/// aa.ply
ply
format ascii 1.0
element vertex 18
property double x
property double y
property double z
element face 20
property list ushort ushort vertex_indices
end_header
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
4 7 8 11 10
4 7 10 16 13
4 1 4 10 7


/// bb.ply
ply
format ascii 1.0
element vertex 8
property double x
property double y
property double z
element face 6
property list ushort ushort vertex_indices
end_header
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