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Fix of extraneous infill over thin walls.

Browse Source 
Fixes https://github.com/prusa3d/Slic3r/issues/670
and some of https://github.com/prusa3d/Slic3r/issues/895

PerimeterGenerator was using an unsafe clipper offset function,
which performed offset for both a contour and its holes together.
With this commit the offsets were replaced with their safe counterparts,
though these safe counterparts may be somehow slower
(performing offset on ExPolygon or ExPolygons, piece by piece).

Also there was a bug, where if the infill & gap fill consumed
everything of the polygon, a polygon one onion shell above was still
used for infill.
This commit is contained in:
bubnikv
2018-05-18 09:52:09 +02:00
parent 651c4ab0ae
commit 3f08ef70f1
4 changed files with 138 additions and 201 deletions
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30
xs/src/libslic3r/ExPolygon.cpp
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@@ -168,52 +168,42 @@ ExPolygon::overlaps(const ExPolygon &other) const
return ! other.contour.points.empty() && this->contains_b(other.contour.points.front());
}
void
ExPolygon::simplify_p(double tolerance, Polygons* polygons) const
void ExPolygon::simplify_p(double tolerance, Polygons* polygons) const
{
Polygons pp = this->simplify_p(tolerance);
polygons->insert(polygons->end(), pp.begin(), pp.end());
}
Polygons
ExPolygon::simplify_p(double tolerance) const
Polygons ExPolygon::simplify_p(double tolerance) const
{
Polygons pp;
pp.reserve(this->holes.size() + 1);
// contour
{
Polygon p = this->contour;
p.points.push_back(p.points.front());
p.points = MultiPoint::_douglas_peucker(p.points, tolerance);
p.points.pop_back();
pp.push_back(p);
pp.emplace_back(std::move(p));
}
// holes
for (Polygons::const_iterator it = this->holes.begin(); it != this->holes.end(); ++it) {
Polygon p = *it;
for (Polygon p : this->holes) {
p.points.push_back(p.points.front());
p.points = MultiPoint::_douglas_peucker(p.points, tolerance);
p.points.pop_back();
pp.push_back(p);
pp.emplace_back(std::move(p));
}
pp = simplify_polygons(pp);
return pp;
return simplify_polygons(pp);
}
ExPolygons
ExPolygon::simplify(double tolerance) const
ExPolygons ExPolygon::simplify(double tolerance) const
{
Polygons pp = this->simplify_p(tolerance);
return union_ex(pp);
return union_ex(this->simplify_p(tolerance));
}
void
ExPolygon::simplify(double tolerance, ExPolygons* expolygons) const
void ExPolygon::simplify(double tolerance, ExPolygons* expolygons) const
{
ExPolygons ep = this->simplify(tolerance);
expolygons->insert(expolygons->end(), ep.begin(), ep.end());
append(*expolygons, this->simplify(tolerance));
}
void