void
ClipperPaths_to_Slic3rExPolygons(const ClipperLib::Paths &input, Slic3r::ExPolygons &output)
{
// init Clipper
ClipperLib::Clipper clipper;
clipper.Clear();
// perform union
clipper.AddPaths(input, ClipperLib::ptSubject, true);
ClipperLib::PolyTree polytree;
clipper.Execute(ClipperLib::ctUnion, polytree, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd); // offset results work with both EvenOdd and NonZero
// write to ExPolygons object
output.clear();
PolyTreeToExPolygons(polytree, output);
}
void PolyTreeToExPolygons(ClipperLib::PolyTree& polytree, Slic3r::ExPolygons& expolygons)
{
expolygons.clear();
for (int i = 0; i < polytree.ChildCount(); ++i)
AddOuterPolyNodeToExPolygons(*polytree.Childs[i], expolygons);
}