diff --git a/contrib/Netgen/LICENSE b/contrib/Netgen/LICENSE
new file mode 100644
index 0000000000000000000000000000000000000000..b1e3f5a2638797271cbc9b91b856c05ed6942c8f
--- /dev/null
+++ b/contrib/Netgen/LICENSE
@@ -0,0 +1,504 @@
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 2.1, February 1999
+
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diff --git a/contrib/Netgen/nglib_gmsh.cpp b/contrib/Netgen/nglib_gmsh.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..eaeb64eb6df05b9a7be563cd3da0aa0eb9f61e1b
--- /dev/null
+++ b/contrib/Netgen/nglib_gmsh.cpp
@@ -0,0 +1,402 @@
+// Interface to the Netgen meshing kernel for Gmsh. This file replaces
+// the original nglib.cpp file from the Netgen distribution
+
+#include <GmshMessage.h>
+#include <linalg.hpp>
+#include <meshing.hpp>
+#include <nginterface.h>
+
+namespace netgen
+{
+ int id, ntasks;
+ MeshingParameters mparam;
+}
+
+namespace nglib {
+#include "nglib.h"
+}
+
+using namespace netgen;
+
+namespace nglib
+{
+ class mystreambuf : public streambuf {
+ int index;
+ char txt[1024];
+ public:
+ mystreambuf() : index(0) {}
+ int sync()
+ {
+ txt[index] = '\0';
+ if(!index || (index == 1 && (txt[0] == '.' || txt[0] == '+' ||
+ txt[0] == ' ' || txt[0] == '*'))){
+ // ignore these messages
+ }
+ else{
+ if(!strncmp(txt, "ERROR", 5))
+ Msg::Error(txt);
+ else
+ Msg::Info(txt);
+ }
+ index = 0;
+ return 0;
+ }
+ int overflow(int ch)
+ {
+ if(index < 1023){
+ txt[index] = ch;
+ if(txt[index] == '\n' || txt[index] == '\r') txt[index] = ' ';
+ if(!index && txt[0] == ' '){
+ // skip initial spaces
+ }
+ else{
+ index++;
+ }
+ }
+ return 0;
+ }
+ };
+
+ // initialize, deconstruct Netgen library:
+ void Ng_Init ()
+ {
+ // mycout = &cout;
+ // myerr = &cerr;
+ // netgen::testout->SetOutStream (new ofstream ("test.out"));
+ // testout = new ofstream ("test.out");
+ static bool first = true;
+ if(first){
+ first = false;
+ //mycout = &cout;
+ //myerr = &cout;
+ //testout = &cout;
+ mycout = new ostream(new mystreambuf());
+ myerr = new ostream(new mystreambuf());
+ testout = new ostream(new mystreambuf());
+ }
+ }
+
+ // Clean-up functions before ending usage of nglib
+ void Ng_Exit ()
+ {
+ ;
+ }
+
+ // Create a new netgen mesh object
+ Ng_Mesh * Ng_NewMesh ()
+ {
+ Mesh * mesh = new Mesh;
+ mesh->AddFaceDescriptor (FaceDescriptor (1, 1, 0, 1));
+ return (Ng_Mesh*)(void*)mesh;
+ }
+
+ // Delete an existing netgen mesh object
+ void Ng_DeleteMesh (Ng_Mesh * mesh)
+ {
+ if(mesh != NULL)
+ {
+ // Delete the Mesh structures
+ ((Mesh*)mesh)->DeleteMesh();
+
+ // Now delete the Mesh class itself
+ delete (Mesh*)mesh;
+
+ // Set the Ng_Mesh pointer to NULL
+ mesh = NULL;
+ }
+ }
+
+ // Manually add a point to an existing mesh object
+ void Ng_AddPoint (Ng_Mesh * mesh, double * x)
+ {
+ Mesh * m = (Mesh*)mesh;
+ m->AddPoint (Point3d (x[0], x[1], x[2]));
+ }
+
+ // Manually add a surface element of a given type to an existing mesh object
+ void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et,
+ int * pi)
+ {
+ Mesh * m = (Mesh*)mesh;
+ Element2d el (3);
+ el.SetIndex (1);
+ el.PNum(1) = pi[0];
+ el.PNum(2) = pi[1];
+ el.PNum(3) = pi[2];
+ m->AddSurfaceElement (el);
+ }
+
+ // Manually add a volume element of a given type to an existing mesh object
+ void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et,
+ int * pi)
+ {
+ Mesh * m = (Mesh*)mesh;
+ Element el (4);
+ el.SetIndex (1);
+ el.PNum(1) = pi[0];
+ el.PNum(2) = pi[1];
+ el.PNum(3) = pi[2];
+ el.PNum(4) = pi[3];
+ m->AddVolumeElement (el);
+ }
+
+ // Obtain the number of points in the mesh
+ int Ng_GetNP (Ng_Mesh * mesh)
+ {
+ return ((Mesh*)mesh) -> GetNP();
+ }
+
+ // Obtain the number of volume elements in the mesh
+ int Ng_GetNE (Ng_Mesh * mesh)
+ {
+ return ((Mesh*)mesh) -> GetNE();
+ }
+
+ // Return point coordinates of a given point index in the mesh
+ void Ng_GetPoint (Ng_Mesh * mesh, int num, double * x)
+ {
+ const Point3d & p = ((Mesh*)mesh)->Point(num);
+ x[0] = p.X();
+ x[1] = p.Y();
+ x[2] = p.Z();
+ }
+
+ // Return the volume element at a given index "pi"
+ Ng_Volume_Element_Type
+ Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi)
+ {
+ const Element & el = ((Mesh*)mesh)->VolumeElement(num);
+ for (int i = 1; i <= el.GetNP(); i++)
+ pi[i-1] = el.PNum(i);
+ Ng_Volume_Element_Type et;
+ switch (el.GetNP())
+ {
+ case 4: et = NG_TET; break;
+ case 5: et = NG_PYRAMID; break;
+ case 6: et = NG_PRISM; break;
+ case 10: et = NG_TET10; break;
+ default:
+ et = NG_TET; break; // for the compiler
+ }
+ return et;
+ }
+
+ // Generates volume mesh from an existing surface mesh
+ Ng_Result Ng_GenerateVolumeMesh (Ng_Mesh * mesh, Ng_Meshing_Parameters * mp)
+ {
+ Mesh * m = (Mesh*)mesh;
+
+ // Philippose - 30/08/2009
+ // Do not locally re-define "mparam" here... "mparam" is a global
+ // object
+ //MeshingParameters mparam;
+ mp->Transfer_Parameters();
+
+ m->CalcLocalH(mparam.grading);
+
+ MeshVolume (mparam, *m);
+ RemoveIllegalElements (*m);
+ OptimizeVolume (mparam, *m);
+
+ return NG_OK;
+ }
+
+ // Generates volume mesh from an existing surface mesh
+ Ng_Result Ng_GenerateVolumeMesh (Ng_Mesh * mesh, double maxh)
+ {
+ Mesh *m = (Mesh*)mesh;
+
+ MeshingParameters mparam;
+ mparam.uselocalh = 1;
+ mparam.maxh = maxh;
+
+ try{
+ m->CalcLocalH(mparam.grading);
+ MeshVolume(mparam, *m);
+ //RemoveIllegalElements(*m);
+ //OptimizeVolume(mparam, *m);
+ }
+ catch(netgen::NgException error){
+ return NG_VOLUME_FAILURE;
+ }
+ return NG_OK;
+ }
+
+// optimizes an existing 3D mesh
+ Ng_Result Ng_OptimizeVolumeMesh(Ng_Mesh *mesh, double maxh)
+ {
+ Mesh *m = (Mesh*)mesh;
+
+ MeshingParameters mparam;
+ mparam.uselocalh = 1;
+ mparam.maxh = maxh;
+
+ try{
+ m->CalcLocalH(mparam.grading);
+ //MeshVolume(mparam, *m);
+ RemoveIllegalElements(*m);
+ OptimizeVolume(mparam, *m);
+ }
+ catch(netgen::NgException error){
+ return NG_VOLUME_FAILURE;
+ }
+ return NG_OK;
+ }
+
+ // ------------------ Begin - Meshing Parameters related functions ------------------
+ // Constructor for the local nglib meshing parameters class
+ Ng_Meshing_Parameters :: Ng_Meshing_Parameters()
+ {
+ uselocalh = 1;
+
+ maxh = 1000;
+ minh = 0.0;
+
+ fineness = 0.5;
+ grading = 0.3;
+
+ elementsperedge = 2.0;
+ elementspercurve = 2.0;
+
+ closeedgeenable = 0;
+ closeedgefact = 2.0;
+
+ second_order = 0;
+ quad_dominated = 0;
+
+ meshsize_filename = 0;
+
+ optsurfmeshenable = 1;
+ optvolmeshenable = 1;
+
+ optsteps_2d = 3;
+ optsteps_3d = 3;
+
+ invert_tets = 0;
+ invert_trigs = 0;
+
+ check_overlap = 1;
+ check_overlapping_boundary = 1;
+ }
+
+ // Reset the local meshing parameters to the default values
+ void Ng_Meshing_Parameters :: Reset_Parameters()
+ {
+ uselocalh = 1;
+
+ maxh = 1000;
+ minh = 0;
+
+ fineness = 0.5;
+ grading = 0.3;
+
+ elementsperedge = 2.0;
+ elementspercurve = 2.0;
+
+ closeedgeenable = 0;
+ closeedgefact = 2.0;
+
+ second_order = 0;
+ quad_dominated = 0;
+
+ meshsize_filename = 0;
+
+ optsurfmeshenable = 1;
+ optvolmeshenable = 1;
+
+ optsteps_2d = 3;
+ optsteps_3d = 3;
+
+ invert_tets = 0;
+ invert_trigs = 0;
+
+ check_overlap = 1;
+ check_overlapping_boundary = 1;
+ }
+
+ //
+ void Ng_Meshing_Parameters :: Transfer_Parameters()
+ {
+ mparam.uselocalh = uselocalh;
+
+ mparam.maxh = maxh;
+ mparam.minh = minh;
+
+ mparam.grading = grading;
+ mparam.curvaturesafety = elementspercurve;
+ mparam.segmentsperedge = elementsperedge;
+
+ mparam.secondorder = second_order;
+ mparam.quad = quad_dominated;
+
+ mparam.meshsizefilename = meshsize_filename;
+
+ mparam.optsteps2d = optsteps_2d;
+ mparam.optsteps3d = optsteps_3d;
+
+ mparam.inverttets = invert_tets;
+ mparam.inverttrigs = invert_trigs;
+
+ mparam.checkoverlap = check_overlap;
+ mparam.checkoverlappingboundary = check_overlapping_boundary;
+ }
+
+} // End of namespace nglib
+
+// compatibility functions:
+namespace netgen
+{
+ char geomfilename[255];
+
+ DLL_HEADER void MyError (const char * ch)
+ {
+ (*myerr) << ch;
+ }
+
+
+
+
+ //Destination for messages, errors, ...
+ DLL_HEADER void Ng_PrintDest(const char * s)
+ {
+ (*mycout) << s << flush;
+ }
+
+
+
+
+ DLL_HEADER double GetTime ()
+ {
+ return 0;
+ }
+
+
+
+
+ void ResetTime ()
+ {
+ ;
+ }
+
+
+
+
+ void MyBeep (int i)
+ {
+ ;
+ }
+
+
+
+
+ void Render()
+ {
+ ;
+ }
+} // End of namespace netgen
+
+
+void Ng_Redraw () { ; }
+void Ng_ClearSolutionData () { ; }
+void Ng_SetSolutionData (Ng_SolutionData * soldata) { ; }
+void Ng_InitSolutionData (Ng_SolutionData * soldata) { ; }
diff --git a/contrib/Netgen/nglib_gmsh.h b/contrib/Netgen/nglib_gmsh.h
new file mode 100644
index 0000000000000000000000000000000000000000..d7e940ddeac2e582348aabfbf337dc27ae209f91
--- /dev/null
+++ b/contrib/Netgen/nglib_gmsh.h
@@ -0,0 +1,9 @@
+#ifndef _NGLIB_GMSH_H_
+#define _NGLIB_GMSH_H_
+
+#include "nglib.h"
+
+Ng_Result Ng_GenerateVolumeMesh(Ng_Mesh *mesh, double maxh);
+Ng_Result Ng_OptimizeVolumeMesh(Ng_Mesh *mesh, double maxh);
+
+#endif