From 1a066caeccc111d3002d6579bdf195c5636ab0dc Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Thu, 17 Nov 2011 10:41:20 +0100
Subject: [PATCH] Compute bridge overlap as twice the total thickness of
 perimeters

---
 lib/Slic3r.pm       | 1 -
 lib/Slic3r/Layer.pm | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index 39342b10a..e0ca7326a 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -64,7 +64,6 @@ our $flow_width;
 # print options
 our $perimeters         = 3;
 our $solid_layers       = 3;
-our $bridge_overlap     = 3;    # mm
 our $perimeter_infill_overlap_ratio = 0.15;   # factor for flow width
 our $fill_pattern       = 'rectilinear';
 our $solid_fill_pattern = 'rectilinear';
diff --git a/lib/Slic3r/Layer.pm b/lib/Slic3r/Layer.pm
index aac37979e..91d279452 100644
--- a/lib/Slic3r/Layer.pm
+++ b/lib/Slic3r/Layer.pm
@@ -438,7 +438,8 @@ sub process_bridges {
         # now, extend our bridge by taking a portion of supporting surfaces
         {
             # offset the bridge by the specified amount of mm
-            my $bridge_offset = ${ offset([$contour], $Slic3r::bridge_overlap / $Slic3r::resolution, $Slic3r::resolution * 100, JT_MITER, 2) }[0];
+            my $bridge_overlap = 2 * $Slic3r::perimeters * $Slic3r::flow_width / $Slic3r::resolution;
+            my $bridge_offset = ${ offset([$contour], $bridge_overlap, $Slic3r::resolution * 100, JT_MITER, 2) }[0];
             
             # calculate the new bridge
             my $intersection = intersection_ex(