From 8c06e5c7d98d2dea9b668bffc95606843c1746dc Mon Sep 17 00:00:00 2001
From: Philipp Oeser <info@graphics-engineer.com>
Date: Wed, 11 Jan 2017 20:56:09 +0100
Subject: Fix T50352: 3D-printing check misinterprates flat ngons as non-flat

---
 object_print3d_utils/operators.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/object_print3d_utils/operators.py b/object_print3d_utils/operators.py
index 47d1f58b..01ef62cc 100644
--- a/object_print3d_utils/operators.py
+++ b/object_print3d_utils/operators.py
@@ -212,7 +212,10 @@ class Print3DCheckDistorted(Operator):
             no = ele.normal
             angle_fn = no.angle
             for loop in ele.loops:
-                if angle_fn(loop.calc_normal(), 1000.0) > angle_distort:
+                loopno = loop.calc_normal()
+                if loopno.dot(no) < 0.0:
+                    loopno.negate()
+                if angle_fn(loopno, 1000.0) > angle_distort:
                     return True
             return False
 
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