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[Bear <>]

Hi, Sebastien.

I create a small example by copying the necessary codes, then the
reconstructed triangulation has no problem. In the old program, I blocked
all other irrelevant codes, then the problem is still there. I am sure the
input data is same. So I am quite confused what is wrong? Is there any
project setting affects?

In order to check the problem, in the old program I changed adding order of
the two polygons, and I find the two Triangulations are different, both
incorrect. I append the two pictures bellow. I also visualize the
triangulation construction step by step after the first polygon is added.
Every step I only add one constraint. Please check the wrong vertexes signed
by greed circles. The wrong vertexes maybe outside or inside the input
polygons. I am sure they are either intersection of constraints or infinite
vertex. I am really confused. Please see the attached PDF files  order1.pdf
<http://cgal-discuss.949826.n4.nabble.com/file/n4657914/order1.pdf>  ,
order2.pdf
<http://cgal-discuss.949826.n4.nabble.com/file/n4657914/order2.pdf>  . 
<http://cgal-discuss.949826.n4.nabble.com/file/n4657914/order_1.png> 
<http://cgal-discuss.949826.n4.nabble.com/file/n4657914/order2.png> 



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