CGAL users discussion list

[Ben Supnik <>]

Hi Y'all,

I have an arrangement (built out of join and difference operations on 
polygons).  I am using an exact pred/exact constructions kernel and half 
-frounding-math on.  I am in debug mode, so I have all warnings, etc.

After building my arrangement, I do an insert-curves on an axis-aligned 
bounding box that sometimes overlaps the horizontal and vertical edges 
of my map.

If I insert the four sides using insert_curve, all is good.
If I insert all four using insert_curves, I get an assertion failure 
when trying to split a face.

Now...looking at the code it seems clear that I should be using 
insert_curve anyway; doing a full copy of the arrangement to put only 
four curves in will be dominated by the copy cost.

But...is there any case where the sweep-line-based insert_curves should 
blow up?  I am concerned that either my map is secretly invalid (it 
passes validation checks) or I have compiler settings such that my 
numerics are not stable.

cheers
ben
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