From 769ec0cb030b0705cd50003ec12d02ef7ac03c1e Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Tue, 26 Mar 2013 13:04:57 +0100
Subject: [PATCH] Better clipping of honeycomb paths

---
 lib/Slic3r/Fill/Honeycomb.pm | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lib/Slic3r/Fill/Honeycomb.pm b/lib/Slic3r/Fill/Honeycomb.pm
index 9e4ff8a27c..a2386d6038 100644
--- a/lib/Slic3r/Fill/Honeycomb.pm
+++ b/lib/Slic3r/Fill/Honeycomb.pm
@@ -78,13 +78,14 @@ sub fill_surface {
         $self->cache->{$cache_id} = [@polygons];
     }
     
-    # build polylines from polygons without re-appending the initial point:
+    # consider polygons as polylines without re-appending the initial point:
     # this cuts the last segment on purpose, so that the jump to the next 
     # path is more straight
-    my @paths = map Slic3r::Polyline->new(@$_), map @$_, @{intersection_ex(
-        $self->cache->{$cache_id},
-        $expolygon,
-    )};
+    my @paths = map Slic3r::Polyline->new($_),
+        @{ Boost::Geometry::Utils::polygon_multi_linestring_intersection(
+            $expolygon,
+            $self->cache->{$cache_id},
+        ) };
     
     return { flow_spacing => $params{flow_spacing} },
         Slic3r::Polyline::Collection->new(polylines => \@paths)->chained_path;