From 6f6ee40daeb9e9e6b1f11cace77a90fc6c21aca4 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 7 Jul 2013 19:12:44 +0200
Subject: Small optimization in case no overhang logic is required at all

---
 lib/Slic3r/GCode.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/Slic3r/GCode.pm b/lib/Slic3r/GCode.pm
index fa61e259b..ccfadc57c 100644
--- a/lib/Slic3r/GCode.pm
+++ b/lib/Slic3r/GCode.pm
@@ -96,8 +96,10 @@ sub change_layer {
     my ($layer) = @_;
     
     $self->layer($layer);
+    
+    # avoid computing overhangs if they're not needed
     $self->_layer_overhangs(
-        $layer->id > 0
+        $layer->id > 0 && ($Slic3r::Config->overhangs || $Slic3r::Config->start_perimeters_at_non_overhang)
             ? [ map $_->expolygon, grep $_->surface_type == S_TYPE_BOTTOM, map @{$_->slices}, @{$layer->regions} ]
             : []
         );
-- 
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