From de9c17ec07cae2b18050c86186d782f15468294f Mon Sep 17 00:00:00 2001
From: Sebastian Hoogen <github@sebastianhoogen.de>
Date: Mon, 7 Jan 2013 12:55:59 +0100
Subject: [PATCH] importCSG reverse polyhedra if they have negative volume

---
 src/Mod/OpenSCAD/importCSG.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Mod/OpenSCAD/importCSG.py b/src/Mod/OpenSCAD/importCSG.py
index ba8ad87ba..9140b2947 100644
--- a/src/Mod/OpenSCAD/importCSG.py
+++ b/src/Mod/OpenSCAD/importCSG.py
@@ -939,7 +939,10 @@ def p_polyhedron_action(p) :
         f = make_face(v[int(i[0])],v[int(i[1])],v[int(i[2])])
         faces_list.append(f)
     shell=Part.makeShell(faces_list)
-    mypolyhed.Shape=Part.Solid(shell) 
+    solid=Part.Solid(shell).removeSplitter()
+    if solid.Volume < 0:
+        solid.reverse()
+    mypolyhed.Shape=solid
     p[0] = [mypolyhed]
 
 def p_projection_action(p) :