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Hi
I have some trouble with Cgal and insetting a 2D polygon.
The main one is : when I want to inset a square 2a*2a for instance with the
radius a, it will fail.
Then, you may inset only with Rationnal coefficients, I can't find any
kernel where the interesection between the displaced walls corresponding to
the walls y=x and y=-x with radius 1 is exactly (0, sqrt(2)).
Moreover, If I use a conic kernel for this inset, and I want to access
coefficients, sometimes it returns 0,0,...,0 (you may just std::cout the
result to see that). Especially when it is a segment.
Finally, sometimes you want to know what displaced wall correspond to what
wall. but there is no option for that in the inset (or offset) function (but
I guess it is not necessary).

Thank you
David 
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