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[tang <>]

Hi Zohar,

Thank you very much for your kindly reply. I have a surface (a1.off) and a
box (a2.off), as shown below. I need to delete the parts of surface that are
inside the box, do you have any suggestion on how to work this?

Thanks,
Tang Laoya

// a1.off
OFF
12 6 0
0 0 0 
0 2 0
0 2 2
0 0 2
0 -2 2
0 -2 0
0 -2 -2
0 0 -2
0 2 -2
1 0 2
1 0 0
1 0 -2
4 0 1 2 3
4 0 3 4 5
4 0 5 6 7
4 0 7 8 1
4 0 3 9 10
4 0 10 11 7

// a2.off
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 5 6 7
4 0 1 5 4 
4 1 2 6 5
4 2 3 7 6
4 3 0 4 7




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