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Fix of https://github.com/prusa3d/Slic3r/issues/214

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Dent in perimeters around a hole

Clipper Offset has been extended to remove tiny edges before the offset.
This is important as the tiny edges pose difficulty
for normal calculation, leading to various adverse effects like
kinks and dents in the offsetted contour.
This commit is contained in:
bubnikv
2017-04-04 11:17:25 +02:00
parent 70fcedb113
commit bd9ee88e2f
4 changed files with 51 additions and 25 deletions
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17
xs/src/libslic3r/ClipperUtils.cpp
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@@ -9,6 +9,8 @@
#include <Shiny/Shiny.h>
#define CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR (0.005f)
namespace Slic3r {
#ifdef CLIPPER_UTILS_DEBUG
@@ -210,9 +212,11 @@ ClipperLib::Paths _offset(ClipperLib::Paths &&input, ClipperLib::EndType endType
co.ArcTolerance = miterLimit;
else
co.MiterLimit = miterLimit;
float delta_scaled = delta * float(CLIPPER_OFFSET_SCALE);
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
co.AddPaths(input, joinType, endType);
ClipperLib::Paths retval;
co.Execute(retval, delta * float(CLIPPER_OFFSET_SCALE));
co.Execute(retval, delta_scaled);
// unscale output
unscaleClipperPolygons(retval);
@@ -244,6 +248,7 @@ ClipperLib::Paths _offset(const Slic3r::ExPolygon &expolygon, const float delta,
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
else
co.MiterLimit = miterLimit;
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(contours, delta_scaled);
}
@@ -260,6 +265,7 @@ ClipperLib::Paths _offset(const Slic3r::ExPolygon &expolygon, const float delta,
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
else
co.MiterLimit = miterLimit;
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
ClipperLib::Paths out;
co.Execute(out, - delta_scaled);
@@ -308,6 +314,7 @@ ClipperLib::Paths _offset(const Slic3r::ExPolygons &expolygons, const float delt
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
else
co.MiterLimit = miterLimit;
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(contours, delta_scaled);
}
@@ -331,6 +338,7 @@ ClipperLib::Paths _offset(const Slic3r::ExPolygons &expolygons, const float delt
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
else
co.MiterLimit = miterLimit;
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
ClipperLib::Paths out;
co.Execute(out, - delta_scaled);
@@ -408,17 +416,20 @@ _offset2(const Polygons &polygons, const float delta1, const float delta2,
} else {
co.MiterLimit = miterLimit;
}
float delta_scaled1 = delta1 * float(CLIPPER_OFFSET_SCALE);
float delta_scaled2 = delta2 * float(CLIPPER_OFFSET_SCALE);
co.ShortestEdgeLength = double(std::max(std::abs(delta_scaled1), std::abs(delta_scaled2)) * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR);
// perform first offset
ClipperLib::Paths output1;
co.AddPaths(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(output1, delta1 * float(CLIPPER_OFFSET_SCALE));
co.Execute(output1, delta_scaled1);
// perform second offset
co.Clear();
co.AddPaths(output1, joinType, ClipperLib::etClosedPolygon);
ClipperLib::Paths retval;
co.Execute(retval, delta2 * float(CLIPPER_OFFSET_SCALE));
co.Execute(retval, delta_scaled2);
// unscale output
unscaleClipperPolygons(retval);