0020105: EDF 862 SMESH : Creation of the skin elements (2D) of a 3D Mesh

doc/salome/gui/SMESH/input/make_2dmesh_from_3d.doc

@@ -0,0 +1,22 @@
+/*!
+
+\page make_2dmesh_from_3d_page Generate the skin elements (2D) of a mesh having 3D elements
+
+\n This functionality allows you to generate 2D mesh elements as skin
+on existing 3D mesh elements
+
+<em>To generate 2D mesh:</em>
+<ol>
+<li>From the Modification menu choose the "Create 2D mesh from 3D"
+Mesh item, or invoke from popup menu.
+
+\image html 2d_from_3d_menu.png
+
+The algorithm detects boundary volume faces without connections to
+other volumes and create 2D mesh elements on face nodes. If mesh
+already contains 2D elements on detected nodes - no new element
+created. The result dilog shows mesh information statistoc about new
+created 2D mesh elements.
+</ol>
+
+*/

doc/salome/gui/SMESH/input/modifying_meshes.doc

@@ -45,9 +45,11 @@ of the selected node or edge.</li>
 <li>Apply \subpage pattern_mapping_page "pattern mapping".</li>
 <li>\subpage convert_to_from_quadratic_mesh_page "Convert regular mesh to quadratic", 
 or vice versa.</li>
+<li>\subpage make_2dmesh_from_3d_page "Create 2D mesh from 3D".</li>
+
 </ul>
 
 \note It is possible to use the variables defined in the SALOME \b NoteBook
  to specify the numerical parameters used for modification of any object.
 
-*/
+*/

src/SMESH/SMESH_MeshEditor.cxx

@@ -8830,7 +8830,8 @@ bool SMESH_MeshEditor::Make2DMeshFrom3D()
   {
     const SMDS_MeshVolume* volume = vIt->next();
     SMDS_VolumeTool vTool( volume );
-    bool isPoly = volume->IsPoly();
+    const bool isPoly = volume->IsPoly();
+    const bool isQuad = volume->IsQuadratic();
     for ( int iface = 0, n = vTool.NbFaces(); iface < n; iface++ )
     {
       if (!vTool.IsFreeFace(iface))
@@ -8838,12 +8839,24 @@ bool SMESH_MeshEditor::Make2DMeshFrom3D()
       vector<const SMDS_MeshNode *> nodes;
       int nbFaceNodes = vTool.NbFaceNodes(iface);
       const SMDS_MeshNode** faceNodes = vTool.GetFaceNodes(iface);
-      if (vTool.IsFaceExternal(iface))
-        for (int inode = 0; inode < nbFaceNodes; inode++)
+      if (vTool.IsFaceExternal(iface)) 
+      {
+        int inode = 0;
+        for ( ; inode < nbFaceNodes; inode += isQuad ? 2 : 1)
           nodes.push_back(faceNodes[inode]);
+        if (isQuad)
+          for ( inode = 1; inode < nbFaceNodes; inode += 2)
+            nodes.push_back(faceNodes[inode]);
+      }
       else
-        for (int inode = nbFaceNodes - 1; inode >= 0; inode--)
+      {
+        int inode = nbFaceNodes-1;
+        for ( ; inode >=0; inode -= isQuad ? 2 : 1)
           nodes.push_back(faceNodes[inode]);
+        if (isQuad)
+          for ( inode = nbFaceNodes-2; inode >=0; inode -= 2)
+            nodes.push_back(faceNodes[inode]);
+      }
 
       // add new face based on volume nodes
       if (aMesh->FindFace( nodes ) )

src/SMESHGUI/SMESHGUI.cxx

@@ -3068,6 +3068,19 @@ void SMESHGUI::initialize( CAM_Application* app )
 	  hyp_alg = hypo + " " + algo;
 
   // popup for object browser
+  QString
+    isInvisible("not( isVisible )"),
+    isEmpty("numberOfNodes = 0"),
+    isNotEmpty("numberOfNodes <> 0"),
+
+    // has nodes, edges, etc in VISIBLE! actor
+    hasNodes("(numberOfNodes > 0 )"),//&& isVisible)"),
+    hasElems("(count( elemTypes ) > 0)"),
+    hasDifferentElems("(count( elemTypes ) > 1)"),
+    hasElems0d("({'Elem0d'} in elemTypes)"),
+    hasEdges("({'Edge'} in elemTypes)"),
+    hasFaces("({'Face'} in elemTypes)"),
+    hasVolumes("({'Volume'} in elemTypes)");
 
   createPopupItem( 150, OB, mesh, "&& selcount=1 && isImported" );      // FILE INFORMATION
   createPopupItem( 703, OB, mesh, "&& isComputable");      // CREATE_SUBMESH
@@ -3096,6 +3109,9 @@ void SMESHGUI::initialize( CAM_Application* app )
   popupMgr()->insert( separator(), -1, 0 );
   createPopupItem( 4043, OB, mesh );                       // CLEAR_MESH
   popupMgr()->insert( separator(), -1, 0 );
+  createPopupItem( 417, OB, mesh/*, "&& " + hasElems*/);       // convert to quadratic
+  createPopupItem( 418, OB, mesh/*, "&& " + hasVolumes*/);     // create 2D mesh on 3D
+  popupMgr()->insert( separator(), -1, 0 );
 
   QString only_one_non_empty = QString( " && %1=1 && numberOfNodes>0" ).arg( dc );
 
@@ -3123,20 +3139,6 @@ void SMESHGUI::initialize( CAM_Application* app )
   popupMgr()->insert( separator(), -1, 0 );
 
   int anId;
-  QString
-    isInvisible("not( isVisible )"),
-    isEmpty("numberOfNodes = 0"),
-    isNotEmpty("numberOfNodes <> 0"),
-
-    // has nodes, edges, etc in VISIBLE! actor
-    hasNodes("(numberOfNodes > 0 )"),//&& isVisible)"),
-    hasElems("(count( elemTypes ) > 0)"),
-    hasDifferentElems("(count( elemTypes ) > 1)"),
-    hasElems0d("({'Elem0d'} in elemTypes)"),
-    hasEdges("({'Edge'} in elemTypes)"),
-    hasFaces("({'Face'} in elemTypes)"),
-    hasVolumes("({'Volume'} in elemTypes)");
-
   QString aClient = QString( "%1client in {%2}" ).arg( lc ).arg( "'VTKViewer'" );
   QString aType = QString( "%1type in {%2}" ).arg( lc );
   aType = aType.arg( mesh_group );