From 7ed98869d26c40a5b54cee31a1859c59cbf1f2dd Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Tue, 13 Sep 2016 14:05:28 +0200
Subject: [PATCH] Update ifcopenshell.geom.app for pyocc-0.16.5

https://github.com/tpaviot/pythonocc-core/commit/3d7b9745359b436b4144105f7e17aa0040acb8c6
---
 src/ifcopenshell-python/ifcopenshell/geom/app.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/ifcopenshell-python/ifcopenshell/geom/app.py b/src/ifcopenshell-python/ifcopenshell/geom/app.py
index badbaa0cad..3207e12fb4 100644
--- a/src/ifcopenshell-python/ifcopenshell/geom/app.py
+++ b/src/ifcopenshell-python/ifcopenshell/geom/app.py
@@ -14,9 +14,16 @@ from PyQt4 import QtGui, QtCore
 try: from OCC.Display.pyqt4Display import qtViewer3d
 except: 
     import OCC.Display
-    OCC.Display.backend.get_backend("qt-pyqt4")
+
+    try: import OCC.Display.backend
+    except: pass
+
+    try: OCC.Display.backend.get_backend("qt-pyqt4")
+    except: OCC.Display.backend.load_backend("qt-pyqt4")
+
     from OCC.Display.qtDisplay import qtViewer3d
-    
+
+
 from .main import create_shape, settings
 from .occ_utils import display_shape