From caa63b946e11991c0a399b9c30c5bf35de1699d8 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sun, 22 Sep 2013 15:32:14 +0200
Subject: [PATCH] 0001228: Cross section of Torus in Part Workbench fails or
 give wrong results

---
 src/Mod/Part/App/CrossSection.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Part/App/CrossSection.cpp b/src/Mod/Part/App/CrossSection.cpp
index 28af55320b..9b1afd3db1 100644
--- a/src/Mod/Part/App/CrossSection.cpp
+++ b/src/Mod/Part/App/CrossSection.cpp
@@ -103,7 +103,15 @@ void CrossSection::sliceSolid(double d, const TopoDS_Shape& shape, std::list<Top
     gp_Pln slicePlane(a,b,c,-d);
     BRepBuilderAPI_MakeFace mkFace(slicePlane);
     TopoDS_Face face = mkFace.Face();
-    BRepPrimAPI_MakeHalfSpace mkSolid(face, gp_Pnt(0,0,d-1));
+
+    // Make sure to choose a point that does not lie on the plane (fixes #0001228)
+    gp_Vec tempVector(a,b,c);
+    tempVector.Normalize();//just in case.
+    tempVector *= (d+1.0);
+    gp_Pnt refPoint(0.0d, 0.0d, 0.0d);
+    refPoint.Translate(tempVector);
+
+    BRepPrimAPI_MakeHalfSpace mkSolid(face, refPoint);
     TopoDS_Solid solid = mkSolid.Solid();
     BRepAlgoAPI_Cut mkCut(shape, solid);