From 31c3b8f09c9a2b9a3bf8c2a1936627f8dda4829f Mon Sep 17 00:00:00 2001
From: SZY and KGV <>
Date: Fri, 24 Jun 2011 08:31:36 +0000
Subject: [PATCH] OCC22576 ShapeFix_Edge::SameParameter() now retains original
 3D interval

---
 src/ShapeFix/ShapeFix_Edge.cxx | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ShapeFix/ShapeFix_Edge.cxx b/src/ShapeFix/ShapeFix_Edge.cxx
index 2a1ba51e91..3170413bf3 100755
--- a/src/ShapeFix/ShapeFix_Edge.cxx
+++ b/src/ShapeFix/ShapeFix_Edge.cxx
@@ -751,6 +751,13 @@ Standard_Boolean ShapeFix_Edge::FixSameParameter(const TopoDS_Edge& edge,
 	//create copyedge as copy of edge with the same vertices and copy of pcurves on the same surface(s)
 	copyedge = ShapeBuild_Edge().Copy ( edge, Standard_False );
 	B.SameParameter ( copyedge, Standard_False );
+        // ShapeBuild_Edge::Copy() may change 3D curve range (if it's outside of its period).
+        // In this case pcurves in BRepLib::SameParameter() will be changed as well
+        // and later ShapeBuild_Edge::CopyPCurves() will copy pcurves keeping original range.
+        // To prevent this discrepancy we enforce original 3D range.
+        Standard_Real aF, aL;
+        BRep_Tool::Range (edge, aF, aL);
+        B.Range (copyedge, aF, aL, Standard_True); // only 3D
 	BRepLib::SameParameter ( copyedge, ( tolerance >= Precision::Confusion() ? 
 					    tolerance : tol ) );
 	SP = BRep_Tool::SameParameter ( copyedge );