* Nglib: Added the capability to merge a VOL mesh file into an already existing mesh in memory

nglib/nglib.cpp

@@ -134,6 +134,56 @@ namespace nglib
 
 
 
+   // Merge another mesh file into the currently loaded one
+   DLL_HEADER Ng_Result Ng_MergeMesh( Ng_Mesh* mesh, const char* filename)
+   {
+      Ng_Result status = NG_OK;
+
+      ifstream infile(filename);
+      Mesh * m = (Mesh*)mesh;
+
+      if(!infile.good())
+      {
+         status = NG_FILE_NOT_FOUND;
+      }
+
+      if(!m)
+      {
+         status = NG_ERROR;
+      }
+
+      if(status == NG_OK)
+      {
+         const int num_pts = m->GetNP();
+         const int face_offset = m->GetNFD();
+
+         m->Merge(infile, face_offset);
+
+         if(m->GetNP() > num_pts)
+         {
+            status = NG_OK;
+         }
+         else
+         {
+            status = NG_ERROR;
+         }
+      }
+
+      return status;
+   }
+
+
+
+
+   // Merge another mesh file into the currently loaded one
+   DLL_HEADER Ng_Result Ng_MergeMesh( Ng_Mesh* mesh1, Ng_Mesh* mesh2)
+   {
+      return NG_ERROR;
+   }
+
+
+
+
    // Manually add a point to an existing mesh object
    DLL_HEADER void Ng_AddPoint (Ng_Mesh * mesh, double * x)
    {

nglib/nglib.h

@@ -254,6 +254,35 @@ DLL_HEADER void Ng_SaveMesh(Ng_Mesh * mesh, const char* filename);
 */
 DLL_HEADER Ng_Mesh * Ng_LoadMesh(const char* filename);
 
+
+/*! \brief Merge a Netgen VOL Mesh from disk into an existing mesh in memory
+
+    A Netgen mesh saved in the internal VOL format can be merged 
+    into an existing Netgen Mesh structure using this function. 
+
+    \param mesh       Name of the Mesh structure already existent in memory
+    \param filename   Pointer to a character array containing the 
+                      name of the file to load
+    \return Ng_Result Status of the merge operation
+*/
+DLL_HEADER Ng_Result Ng_MergeMesh(Ng_Mesh * mesh, const char* filename);
+
+
+/*! \brief Merge one Netgen Mesh into another Netgen Mesh in the case 
+    when both are already in memory
+
+    (NOTE: FUNCTION STILL WORK IN PROGRESS!!!)
+
+    This function can be used to merge two Netgen meshes already present 
+    in memory.
+
+    \param mesh1      Parent Mesh structure into which the second mesh 
+                      will be merged
+    \param mesh2      Child mesh structure which will get merged into 
+                      the parent mesh
+    \return Ng_Result Status of the merge operation
+*/
+DLL_HEADER Ng_Result Ng_MergeMesh(Ng_Mesh * mesh1, Ng_Mesh * mesh2);
 // ------------------------------------------------------------------