From 5beb2187d3f9231f4c5cc20d8821a0f3b199c244 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Fri, 29 Mar 2013 19:24:08 +0100
Subject: [PATCH] Bugfix: infill direction wasn't correctly alternated when
 infilling every 2 layers. #1068

---
 lib/Slic3r/Surface.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Slic3r/Surface.pm b/lib/Slic3r/Surface.pm
index b18d2e467..06c887de3 100644
--- a/lib/Slic3r/Surface.pm
+++ b/lib/Slic3r/Surface.pm
@@ -28,7 +28,7 @@ sub new {
     my $self = [
         map delete $args{$_}, qw(expolygon surface_type thickness thickness_layers bridge_angle extra_perimeters),
     ];
-    $self->[S_THICKNESS_LAYERS] = 1;
+    $self->[S_THICKNESS_LAYERS] //= 1;
     
     bless $self, $class;
     $self;