From 3ba3d8a91d1747db171e88cc097658e1349b5440 Mon Sep 17 00:00:00 2001
From: dmv <dmv@opencascade.com>
Date: Thu, 5 Nov 2009 15:06:10 +0000
Subject: [PATCH] 0020575: EDF 1162 SMESH: Mesh is displayed in "Nodes" mode
 after compute

---
 src/OBJECT/SMESH_Object.cxx        | 13 +++++++++++++
 src/OBJECT/SMESH_Object.h          |  1 +
 src/OBJECT/SMESH_ObjectDef.h       |  2 ++
 src/SMESHGUI/SMESHGUI_VTKUtils.cxx |  3 ++-
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/OBJECT/SMESH_Object.cxx b/src/OBJECT/SMESH_Object.cxx
index a6908f78e..e7ef139a4 100644
--- a/src/OBJECT/SMESH_Object.cxx
+++ b/src/OBJECT/SMESH_Object.cxx
@@ -520,6 +520,19 @@ bool SMESH_VisualObjDef::GetEdgeNodes( const int theElemId,
   return true;
 }
 
+//=================================================================================
+// function : IsValid
+// purpose  : Return true if there are some entities
+//=================================================================================
+bool SMESH_VisualObjDef::IsValid() const
+{
+  return GetNbEntities(SMDSAbs_Node) > 0      || 
+         GetNbEntities(SMDSAbs_0DElement) > 0 || 
+         GetNbEntities(SMDSAbs_Edge) > 0      || 
+         GetNbEntities(SMDSAbs_Face) > 0      ||
+         GetNbEntities(SMDSAbs_Volume) > 0 ;
+}
+
 /*
   Class       : SMESH_MeshObj
   Description : Class for visualisation of mesh
diff --git a/src/OBJECT/SMESH_Object.h b/src/OBJECT/SMESH_Object.h
index 118c13ad8..3bc178eca 100644
--- a/src/OBJECT/SMESH_Object.h
+++ b/src/OBJECT/SMESH_Object.h
@@ -65,6 +65,7 @@ public:
                              const int theEdgeNum,
                              int&      theNodeId1,
                              int&      theNodeId2 ) const = 0;
+  virtual bool              IsValid() const = 0;
   
   virtual vtkUnstructuredGrid* GetUnstructuredGrid() = 0;
   
diff --git a/src/OBJECT/SMESH_ObjectDef.h b/src/OBJECT/SMESH_ObjectDef.h
index 094504f33..82f540913 100644
--- a/src/OBJECT/SMESH_ObjectDef.h
+++ b/src/OBJECT/SMESH_ObjectDef.h
@@ -69,6 +69,8 @@ public:
   virtual bool              IsNodePrs() const = 0;
   virtual SMDS_Mesh*        GetMesh() const = 0;
 
+  virtual bool              IsValid() const;
+
   virtual bool              GetEdgeNodes( const int theElemId,
                                           const int theEdgeNum,
                                           int&      theNodeId1,
diff --git a/src/SMESHGUI/SMESHGUI_VTKUtils.cxx b/src/SMESHGUI/SMESHGUI_VTKUtils.cxx
index 3841a194e..7b5db1430 100644
--- a/src/SMESHGUI/SMESHGUI_VTKUtils.cxx
+++ b/src/SMESHGUI/SMESHGUI_VTKUtils.cxx
@@ -712,7 +712,8 @@ namespace SMESH
               _PTR(Study) aDocument = aStudy->studyDS();
               // Pass non-visual objects (hypotheses, etc.), return true in this case
               CORBA::Long anId = aDocument->StudyId();
-              if (TVisualObjPtr aVisualObj = GetVisualObj(anId,theEntry))
+              TVisualObjPtr aVisualObj;
+              if ( (aVisualObj = GetVisualObj(anId,theEntry)) && aVisualObj->IsValid())
               {
                 if ((anActor = CreateActor(aDocument,theEntry,true))) {
                   bool needFitAll = noSmeshActors(theWnd); // fit for the first object only
-- 
2.39.2