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Fix of Can't convert polyline with more than two points to a line (#6933)

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Sometimes Clipper produces a polyline with more than 2 points when
clipping a line with a polygon or a set of polygons. We hope the intermediate
points are collinear with the line, so we may just ignore them.
This commit is contained in:
Vojtech Bubnik 2021-09-13 15:40:56 +02:00
parent cab71073a1
commit 0a51afa3e6
5 changed files with 9 additions and 11 deletions
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4
src/libslic3r/ClipperUtils.cpp
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@ -647,7 +647,9 @@ Lines _clipper_ln(ClipperLib::ClipType clipType, const Lines &subject, const Pol
// convert Polylines to Lines
Lines retval;
for (Polylines::const_iterator polyline = polylines.begin(); polyline != polylines.end(); ++polyline)
retval.emplace_back(polyline->line());
if (polyline->size() >= 2)
//FIXME It may happen, that Clipper produced a polyline with more than 2 collinear points by clipping a single line with polygons. It is a very rare issue, but it happens, see GH #6933.
retval.push_back({ polyline->front(), polyline->back() });
return retval;
}