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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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3
xs/src/libslic3r/ClipperUtils.hpp
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@ -80,6 +80,9 @@ Slic3r::Polygons offset2(const Slic3r::Polygons &polygons, const float delta1,
Slic3r::ExPolygons offset2_ex(const Slic3r::Polygons &polygons, const float delta1,
const float delta2, ClipperLib::JoinType joinType = ClipperLib::jtMiter,
double miterLimit = 3);
Slic3r::ExPolygons offset2_ex(const Slic3r::ExPolygons &expolygons, const float delta1,
const float delta2, ClipperLib::JoinType joinType = ClipperLib::jtMiter,
double miterLimit = 3);
Slic3r::Polygons _clipper(ClipperLib::ClipType clipType,
const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, bool safety_offset_ = false);