id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8183	boost::geometry::intersection on two polygons returns incorrect empty intersection	matthewd@…	Barend Gehrels	"Hi

The code snippet intersects 2 2D polygons resulting in an empty intersection. I'm including an image of the two polygons and they are overlapping. There may be a problem because the polygons share an overlapping edge?

Thanks

Matthew Danielsen

{{{

polygon_2d triangle2D;
{
    const double triangle2Dcoor[] = {{0.891747, 2.28756}, {0.490911, -1.52549}, {-1.72945, -1.52549}, {0.891747, 2.28756}};
    assign(triangle2D, triangle2Dcoor);
}

polygon_2d box2D;
{
    const double box2Dcoor[] = {{-1.6744, -1.52549}, {-1.70498, -1.52549}, {-1.70052, -1.49155}, {-1.67049, -1.49579}, {-1.6744, -1.52549}};
    assign(box2D, box2Dcoor);
}

boost::geometry::model::multi_polygon< boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<T> > > intersectionPolygons;
boost::geometry::intersection(triangle2D, box2D, intersectionPolygons);
assert(intersectionPolygons.size() != 0); //  Assert fails

}}}
"	Bugs	assigned	To Be Determined	geometry	Boost 1.52.0	Problem