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[memecs <>]

Ok so I was wrong. My code is indeed equivalent to the draw_dual fun except
that to be able to rebuild the voronoi faces I iterate through the delaunay
edges incident to a delaunay vertex.

The problem with NaN comes up when I intersect a voronoi segment/ray/line
with a rectangle:


        if(CGAL::assign(segment,voronoi_obj)) {
                // OK here...
                intersection_obj = CGAL::intersection(segment,bbox);
                if(CGAL::assign(segment,intersection_obj)) {
                        // Sometimes I get segment with NaN
                }
        }

Example:

voronoi segment: 429.5 84 429.5 84
voronoi intersection: 429.5 84 -nan -nan


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