From 081c1d681c7822902dbbf51b1a136c4122a9f113 Mon Sep 17 00:00:00 2001
From: bubnikv <bubnikv@gmail.com>
Date: Fri, 20 Jan 2017 20:20:41 +0100
Subject: [PATCH] Fixed preview of ExtrusionMultiPath instances.

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

diff --git a/lib/Slic3r/GUI/3DScene.pm b/lib/Slic3r/GUI/3DScene.pm
index 8a9713807..c1f82f4c8 100644
--- a/lib/Slic3r/GUI/3DScene.pm
+++ b/lib/Slic3r/GUI/3DScene.pm
@@ -1969,7 +1969,8 @@ sub _extrusionentity_to_verts {
         $lines   = [];
         $widths  = [];
         $heights = [];
-        $closed  = 1;
+        # $entity is either of type Slic3r::ExtrusionLoop or Slic3r::ExtrusionMultiPath.
+        $closed  = $entity->isa('Slic3r::ExtrusionLoop') ? 1 : 0;
         foreach my $path (@$entity) {
             my $polyline = $path->polyline->clone;
             $polyline->remove_duplicate_points;