From 6056cf74723266b46f830e06d00f0d1d33e8c28e Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Tue, 7 Aug 2012 09:16:38 +0000
Subject: [PATCH] 0021765: EDF 2334 SMESH: ConvertToQuadratic with medium node
 on geometry generates bad elements

+   * \brief Enables fixing node parameters on EDGEs and FACEs by
+   * GetNodeU(...,check=true), GetNodeUV(...,check=true), CheckNodeUV() and
+   * CheckNodeU() in case if a node lies on a shape set via SetSubShape().
+   * Default is False
+   */
+  void ToFixNodeParameters(bool toFix);
---
 src/SMESH/SMESH_MesherHelper.cxx | 24 ++++++++++++++++++++----
 src/SMESH/SMESH_MesherHelper.hxx | 10 +++++++++-
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/src/SMESH/SMESH_MesherHelper.cxx b/src/SMESH/SMESH_MesherHelper.cxx
index b05dfbc56..efaf7a853 100644
--- a/src/SMESH/SMESH_MesherHelper.cxx
+++ b/src/SMESH/SMESH_MesherHelper.cxx
@@ -78,7 +78,8 @@ namespace {
 //================================================================================
 
 SMESH_MesherHelper::SMESH_MesherHelper(SMESH_Mesh& theMesh)
-  : myParIndex(0), myMesh(&theMesh), myShapeID(0), myCreateQuadratic(false)
+  : myParIndex(0), myMesh(&theMesh), myShapeID(0), myCreateQuadratic(false),
+    myFixNodeParameters(false)
 {
   myPar1[0] = myPar2[0] = myPar1[1] = myPar2[1] = 0;
   mySetElemOnShape = ( ! myMesh->HasShapeToMesh() );
@@ -440,6 +441,20 @@ void SMESH_MesherHelper::setPosOnShapeValidity(int shapeID, bool ok ) const
   ((SMESH_MesherHelper*)this)->myNodePosShapesValidity.insert( make_pair( shapeID, ok));
 }
 
+//=======================================================================
+//function : ToFixNodeParameters
+//purpose  : Enables fixing node parameters on EDGEs and FACEs in 
+//           GetNodeU(...,check=true), GetNodeUV(...,check=true), CheckNodeUV() and
+//           CheckNodeU() in case if a node lies on a shape set via SetSubShape().
+//           Default is False
+//=======================================================================
+
+void SMESH_MesherHelper::ToFixNodeParameters(bool toFix)
+{
+  myFixNodeParameters = toFix;
+}
+
+
 //=======================================================================
 //function : GetUVOnSeam
 //purpose  : Select UV on either of 2 pcurves of a seam edge, closest to the given UV
@@ -650,7 +665,7 @@ bool SMESH_MesherHelper::CheckNodeUV(const TopoDS_Face&   F,
         return false;
       }
       // store the fixed UV on the face
-      if ( myShape.IsSame(F) && shapeID == myShapeID )
+      if ( myShape.IsSame(F) && shapeID == myShapeID && myFixNodeParameters )
         const_cast<SMDS_MeshNode*>(n)->SetPosition
           ( SMDS_PositionPtr( new SMDS_FacePosition( U, V )));
     }
@@ -873,7 +888,7 @@ bool SMESH_MesherHelper::CheckNodeU(const TopoDS_Edge&   E,
           return false;
         }
         // store the fixed U on the edge
-        if ( myShape.IsSame(E) && shapeID == myShapeID )
+        if ( myShape.IsSame(E) && shapeID == myShapeID && myFixNodeParameters )
           const_cast<SMDS_MeshNode*>(n)->SetPosition
             ( SMDS_PositionPtr( new SMDS_EdgePosition( U )));
       }
@@ -3023,7 +3038,7 @@ void SMESH_MesherHelper::FixQuadraticElements(bool volumeOnly)
   if ( getenv("NO_FixQuadraticElements") )
     return;
 
-  // 0. Apply algorithm to solids or geom faces
+  // 0. Apply algorithm to SOLIDs or FACEs
   // ----------------------------------------------
   if ( myShape.IsNull() ) {
     if ( !myMesh->HasShapeToMesh() ) return;
@@ -3062,6 +3077,7 @@ void SMESH_MesherHelper::FixQuadraticElements(bool volumeOnly)
       SMESH_MesherHelper h(*myMesh);
       h.SetSubShape( fIt.Key() );
       h.FixQuadraticElements(true);
+      h.ToFixNodeParameters(true);
     }
     //perf_print_all_meters(1);
     return;
diff --git a/src/SMESH/SMESH_MesherHelper.hxx b/src/SMESH/SMESH_MesherHelper.hxx
index 9147a1415..c74dfb858 100644
--- a/src/SMESH/SMESH_MesherHelper.hxx
+++ b/src/SMESH/SMESH_MesherHelper.hxx
@@ -322,6 +322,14 @@ public:
                                         const std::vector<int>&                  quantities,
                                         const int                                ID=0,
                                         const bool                               force3d = true);
+  /*!
+   * \brief Enables fixing node parameters on EDGEs and FACEs by
+   * GetNodeU(...,check=true), GetNodeUV(...,check=true), CheckNodeUV() and
+   * CheckNodeU() in case if a node lies on a shape set via SetSubShape().
+   * Default is False
+   */
+  void ToFixNodeParameters(bool toFix);
+
   /*!
    * \brief Return U of the given node on the edge
    */
@@ -549,9 +557,9 @@ protected:
   SMESH_Mesh*     myMesh;
   int             myShapeID;
 
-  // to create quadratic elements
   bool            myCreateQuadratic;
   bool            mySetElemOnShape;
+  bool            myFixNodeParameters;
 
   std::map< int,bool > myNodePosShapesValidity;
   bool toCheckPosOnShape(int shapeID ) const;
-- 
2.39.2