From d398c27e1fa437eb137461428d96798439ea2eba Mon Sep 17 00:00:00 2001
From: Joseph Lenox <lenox.joseph@gmail.com>
Date: Sun, 27 Nov 2016 11:34:38 -0600
Subject: [PATCH] Avoid recentering viewport if the bounding box is max size 0,
 as noticed by @jreinam

---
 lib/Slic3r/GUI/3DScene.pm | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/Slic3r/GUI/3DScene.pm b/lib/Slic3r/GUI/3DScene.pm
index 61d45f1f4..c16312b21 100644
--- a/lib/Slic3r/GUI/3DScene.pm
+++ b/lib/Slic3r/GUI/3DScene.pm
@@ -370,12 +370,15 @@ sub zoom_to_bounding_box {
     # bounding box
     my $max_size = max(@{$bb->size}) * 2;
     my $min_viewport_size = min($self->GetSizeWH);
-    $self->_zoom($min_viewport_size / $max_size);
+    if ($max_size != 0) {
+        # only re-zoom if we have a valid bounding box, avoid a divide by 0 error.
+        $self->_zoom($min_viewport_size / $max_size);
     
-    # center view around bounding box center
-    $self->_camera_target($bb->center);
+        # center view around bounding box center
+        $self->_camera_target($bb->center);
     
-    $self->on_viewport_changed->() if $self->on_viewport_changed;
+        $self->on_viewport_changed->() if $self->on_viewport_changed;
+    }
 }
 
 sub zoom_to_bed {