From 7fbe94d5b4789e2d9356196b26d5ef1d6036dc6c Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Sat, 13 Nov 2010 08:59:22 +0000
Subject: [PATCH] 0020973: EDF 1554 GHS3DPLUGIN: Make possible to have a mixed
 mesh hexa-tetra with GHS3D     re-check adjacent pyramids after fixing
 intersection with non-adjacent one

---
 .../StdMeshers_QuadToTriaAdaptor.cxx          | 36 +++++++++++++------
 1 file changed, 25 insertions(+), 11 deletions(-)

diff --git a/src/StdMeshers/StdMeshers_QuadToTriaAdaptor.cxx b/src/StdMeshers/StdMeshers_QuadToTriaAdaptor.cxx
index 3ae9552d9..8e2718dd0 100644
--- a/src/StdMeshers/StdMeshers_QuadToTriaAdaptor.cxx
+++ b/src/StdMeshers/StdMeshers_QuadToTriaAdaptor.cxx
@@ -46,7 +46,7 @@ using namespace std;
 
 enum EQuadNature { NOT_QUAD, QUAD, DEGEN_QUAD };
 
-  // std-like iterator used to get coordinates of nodes of mesh element
+// std-like iterator used to get coordinates of nodes of mesh element
 typedef SMDS_StdIterator< SMESH_MeshEditor::TNodeXYZ, SMDS_ElemIteratorPtr > TXyzIterator;
 
 namespace
@@ -60,7 +60,7 @@ namespace
    */
   //================================================================================
 
-  class SMDS_EXPORT Q2TAdaptor_Triangle : public SMDS_MeshFace
+  class STDMESHERS_EXPORT Q2TAdaptor_Triangle : public SMDS_MeshFace
   {
     const SMDS_MeshNode* _nodes[3];
   public:
@@ -183,7 +183,7 @@ namespace
   //================================================================================
   /*!
    * \brief Return true if two adjacent pyramids are too close one to another
-   * so that a tetrahedron to built between them whoul have too poor quality
+   * so that a tetrahedron to built between them would have too poor quality
    */
   //================================================================================
 
@@ -228,7 +228,7 @@ namespace
 
     // Check angle between normals
     double angle = nI.Angle( nJ );
-    bool tooClose = ( angle < 10 * PI180 );
+    bool tooClose = ( angle < 15 * PI180 );
 
     // Check if pyramids collide
     bool isOutI, isOutJ;
@@ -315,8 +315,14 @@ namespace
       }
     }
     if ( !mergedPyrams.empty() )
-      for (TIDSortedElemSet::iterator prm = mergedPyrams.begin(); prm != mergedPyrams.end(); ++prm)
+    {
+      TIDSortedElemSet::iterator prm;
+//       for (prm = mergedPyrams.begin(); prm != mergedPyrams.end(); ++prm)
+//         MergeAdjacent( *prm, mesh, nodesToMove );
+
+      for (prm = adjacentPyrams.begin(); prm != adjacentPyrams.end(); ++prm)
         MergeAdjacent( *prm, mesh, nodesToMove );
+    }
   }
 }
 
@@ -327,7 +333,7 @@ namespace
 //================================================================================
 
 StdMeshers_QuadToTriaAdaptor::StdMeshers_QuadToTriaAdaptor():
-  myElemSearcher(0)
+  myElemSearcher(0), myNbTriangles(0)
 {
 }
 
@@ -574,9 +580,11 @@ int StdMeshers_QuadToTriaAdaptor::Preparation(const SMDS_MeshElement*       face
                                               gp_Vec&                       VNorm,
                                               const SMDS_MeshElement**      volumes)
 {
-  if( face->NbNodes() != ( face->IsQuadratic() ? 8 : 4 ))
-    if( face->NbNodes() != 4 )
-      return NOT_QUAD;
+  if( face->NbCornerNodes() != 4 )
+  {
+    myNbTriangles += int( face->NbCornerNodes() == 3 );
+    return NOT_QUAD;
+  }
 
   int i = 0;
   gp_XYZ xyzC(0., 0., 0.);
@@ -690,6 +698,8 @@ bool StdMeshers_QuadToTriaAdaptor::Compute(SMESH_Mesh& aMesh, const TopoDS_Shape
 {
   myResMap.clear();
   myPyramids.clear();
+  myNbTriangles = 0;
+  myShape = aShape;
 
   SMESHDS_Mesh * meshDS = aMesh.GetMeshDS();
   SMESH_MesherHelper helper(aMesh);
@@ -1138,6 +1148,10 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh& aMesh)
             nodesToMove.insert( aNode1 );
             nodesToMove.insert( aNode2 );
           }
+          // fix intersections that could appear after apex movement
+          MergeAdjacent( PrmI, aMesh, nodesToMove );
+          MergeAdjacent( PrmJ, aMesh, nodesToMove );
+
         } // end if(hasInt)
       } // loop on suspectPyrams
     }  // loop on 4 base nodes of PrmI
@@ -1159,7 +1173,7 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh& aMesh)
     if ( q2t->first == q2tPrev->first )
       q2tPrev->second.splice( q2tPrev->second.end(), q2t->second );
   }
-  // delete removed triangles
+  // delete removed triangles and count resulting nb of triangles
   for ( q2t = myResMap.begin(); q2t != myResMap.end(); ++q2t )
   {
     TTriaList & trias = q2t->second;
@@ -1167,7 +1181,7 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh& aMesh)
       if ( ((const Q2TAdaptor_Triangle*) *tri)->IsRemoved() )
         delete *tri, trias.erase( tri++ );
       else
-        tri++;
+        tri++, myNbTriangles++;
   }
 
   myPyramids.clear(); // no more needed