id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13519	Invalid result for boost::geometry::difference	lehnert@…	Barend Gehrels	"Hello,

executing the following polygon difference operation produces an obviously incorrect result.
From a relatively large face a small face is subtracted and the result is very small.

Code snippet:

    using point_type = boost::geometry::model::d2::point_xy<double>; 
    using polygon = boost::geometry::model::polygon<point_type>; 
    using multi_polygon = boost::geometry::model::multi_polygon<polygon>;

    polygon op1, op2; multi_polygon result;

    boost::geometry::read_wkt(""MULTIPOLYGON(((-1.54499301090586272 0.996130119403307535, -1.54499299947730218 0.99761525234323567, -1.54655249947779994 0.995186041738558957, -1.54499301090586272 0.996130119403307535)), ((-1.54655249947779994 0.995186041738558957, -1.54499301719928761 0.995312293499367451, -1.54499301635595665 0.995421883734666779, -1.54655249947779994 0.995186041738558957)), ((-1.5466074994591299 1.08624204173854011, -1.54631431516927331 1.08619819902499004, -1.54633399044383202 1.08621614521949872, -1.5466074994591299 1.08624204173854011)), ((-1.5466074994591299 1.08624204173854011, -1.54499299946018764 1.08107828103308101, -1.54499301135365474 1.08339600649103418, -1.5466074994591299 1.08624204173854011)), ((-1.53918049946492008 1.05799404173705991, -1.5466074994591299 1.08624204173854011, -1.54634340852929708 1.08622473535414787, -1.99999999954877006 1.5, -1.99999999954877006 0.5, -1.54499301954877 0.995006979999999985, -1.54499301770602582 0.995246443249784174, -1.54655249947779994 0.995186041738558957, -1.54499299947244828 1.02129648988327593, -1.5449929994644851 1.06013330832250108, -1.5466074994591299 1.08624204173854011, -1.54499299946029955 1.08053288029024164, -1.53891949946469997 1.05905604173701007, -1.53918049946492008 1.05799404173705991)))"", op1);

    boost::geometry::read_wkt(""POLYGON((-1.53581949946317997 1.06649704173632998, -1.5466074994591299 1.08624204173854011, -1.53723249946403007 1.06231704173661989, -1.53581949946317997 1.06649704173632998))"", op2);

    boost::geometry::difference(op1, op2, result);

"	Bugs	new	To Be Determined	geometry	Boost 1.66.0	Problem		geometry difference