From c6ef81fb91683d8169b5470d571b8b6f47b24fe6 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 16 Jun 2013 18:08:17 +0200
Subject: [PATCH] Modify overhang detection algorithm

---
 lib/Slic3r/Layer/Region.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Slic3r/Layer/Region.pm b/lib/Slic3r/Layer/Region.pm
index a407525623..8117f2380b 100644
--- a/lib/Slic3r/Layer/Region.pm
+++ b/lib/Slic3r/Layer/Region.pm
@@ -267,8 +267,9 @@ sub make_perimeters {
             }
             
             if ($self->id > 0) {
+                # A perimeter is considered overhang if its centerline exceeds the lower layer slices
                 my $is_overhang = $is_contour
-                    ? @{diff([$polygon], [ @lower_slices, offset([$polygon], -$self->perimeter_flow->scaled_width) ])}
+                    ? @{diff([$polygon], \@lower_slices)}
                     : !@{intersection([$polygon], \@lower_slices)};
                 
                 $role = EXTR_ROLE_OVERHANG_PERIMETER if $is_overhang;