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add Ng_OptimizeVolume

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add Ng_AddLockedPoint
extend API so user can set/get domain for element (optional -> does not break existing API)

the commit also (optionally) allows to send log messages (cout, cerr, testout) to a Null stream buffer. this allows applications to make netgen quiet
This commit is contained in:
Bryn Lloyd 2019-02-27 20:32:57 +01:00
parent fa1353dd07
commit 63d1380bdb
2 changed files with 112 additions and 36 deletions
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119
nglib/nglib.cpp
View File

@ -23,8 +23,6 @@
#include <occgeom.hpp>
#endif
#include <nginterface.h>
namespace netgen {
extern void MeshFromSpline2D (SplineGeometry2d & geometry,
@ -73,16 +71,26 @@ using namespace netgen;
namespace nglib
{
inline void NOOP_Deleter(void *) { ; }
inline void NOOP_Deleter(void *) { ; }
// initialize, deconstruct Netgen library:
DLL_HEADER void Ng_Init ()
class NullStreambuf : public std::streambuf
{
mycout = &cout;
myerr = &cerr;
// netgen::testout->SetOutStream (new ofstream ("test.out"));
testout = new ofstream ("test.out");
char dummyBuffer[64];
protected:
virtual int overflow(int c)
{
setp(dummyBuffer, dummyBuffer + sizeof(dummyBuffer));
return (c == traits_type::eof()) ? '\0' : c;
}
};
// initialize, deconstruct Netgen library:
DLL_HEADER void Ng_Init (bool cout_to_null, bool cerr_to_null, bool testout_to_null)
{
static ostream* null_stream = new ostream(new NullStreambuf);
mycout = cout_to_null ? null_stream : &cout;
myerr = cerr_to_null ? null_stream : &cerr;
testout = testout_to_null ? null_stream : new ofstream("test.out");
}
@ -205,18 +213,39 @@ namespace nglib
}
// Manually lock a specific point
DLL_HEADER void Ng_AddLockedPoint(Ng_Mesh * mesh, int pi)
{
Mesh * m = (Mesh*)mesh;
m->AddLockedPoint(pi);
}
// Manually add a surface element of a given type to an existing mesh object
DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et,
int * pi)
int * pi, int domain)
{
int n = 3;
switch (et)
{
case NG_TRIG:
n = 3; break;
case NG_QUAD:
n = 4; break;
case NG_QUAD6:
n = 6; break;
case NG_TRIG6:
n = 6; break;
case NG_QUAD8:
n = 8; break;
default: break;
}
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];
Element2d el (n);
el.SetIndex (domain);
for (int i=0; i<n; ++i)
el.PNum(i+1) = pi[i];
m->AddSurfaceElement (el);
}
@ -225,15 +254,27 @@ namespace nglib
// Manually add a volume element of a given type to an existing mesh object
DLL_HEADER void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et,
int * pi)
int * pi, int domain)
{
int n = 4;
switch (et)
{
case NG_TET:
n = 4; break;
case NG_PYRAMID:
n = 5; break;
case NG_PRISM:
n = 6; break;
case NG_TET10:
n = 10; break;
default: break;
}
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];
Element el (n);
el.SetIndex (domain);
for (int i=0; i<n; ++i)
el.PNum(i+1) = pi[i];
m->AddVolumeElement (el);
}
@ -281,7 +322,7 @@ namespace nglib
// Return the surface element at a given index "pi"
DLL_HEADER Ng_Surface_Element_Type
Ng_GetSurfaceElement (Ng_Mesh * mesh, int num, int * pi)
Ng_GetSurfaceElement (Ng_Mesh * mesh, int num, int * pi, int * domain)
{
const Element2d & el = ((Mesh*)mesh)->SurfaceElement(num);
for (int i = 1; i <= el.GetNP(); i++)
@ -304,6 +345,8 @@ namespace nglib
default:
et = NG_TRIG; break; // for the compiler
}
if (domain)
*domain = el.GetIndex();
return et;
}
@ -312,7 +355,7 @@ namespace nglib
// Return the volume element at a given index "pi"
DLL_HEADER Ng_Volume_Element_Type
Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi)
Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi, int * domain)
{
const Element & el = ((Mesh*)mesh)->VolumeElement(num);
for (int i = 1; i <= el.GetNP(); i++)
@ -327,6 +370,8 @@ namespace nglib
default:
et = NG_TET; break; // for the compiler
}
if (domain)
*domain = el.GetIndex();
return et;
}
@ -386,6 +431,24 @@ namespace nglib
// Optimize existing mesh
DLL_HEADER Ng_Result Ng_OptimizeVolume(Ng_Mesh *mesh, Ng_Meshing_Parameters *mp)
{
Mesh * m = (Mesh*)mesh;
mp->Transfer_Parameters();
m->CalcLocalH(mparam.grading);
RemoveIllegalElements(*m);
OptimizeVolume(mparam, *m);
return NG_OK;
}
/* ------------------ 2D Meshing Functions ------------------------- */
DLL_HEADER void Ng_AddPoint_2D (Ng_Mesh * mesh, double * x)
{
@ -397,14 +460,16 @@ namespace nglib
DLL_HEADER void Ng_AddBoundarySeg_2D (Ng_Mesh * mesh, int pi1, int pi2)
DLL_HEADER void Ng_AddBoundarySeg_2D (Ng_Mesh * mesh, int pi1, int pi2, int domain_in, int domain_out)
{
Mesh * m = (Mesh*)mesh;
Segment seg;
seg[0] = pi1;
seg[1] = pi2;
m->AddSegment (seg);
seg.domin = domain_in;
seg.domout = domain_out;
m->AddSegment(seg);
}

29
nglib/nglib.h
View File

@ -193,7 +193,7 @@ public:
program before beginning to use the other Netgen
specific functions.
*/
DLL_HEADER void Ng_Init ();
DLL_HEADER void Ng_Init (bool cout_to_null = false, bool cerr_to_null = false, bool testout_to_null = false);
/*! \brief Exit the Netgen meshing kernel in a clean manner
@ -312,6 +312,11 @@ DLL_HEADER Ng_Result Ng_MergeMesh(Ng_Mesh * mesh1, Ng_Mesh * mesh2);
DLL_HEADER void Ng_AddPoint (Ng_Mesh * mesh, double * x);
/*! Add locked point which should not get modified by optimization routines
*/
DLL_HEADER void Ng_AddLockedPoint(Ng_Mesh * mesh, int pi);
/*! \brief Add a surface element to a given Netgen Mesh Structure
This function allows the top-level code to directly add individual
@ -332,7 +337,7 @@ DLL_HEADER void Ng_AddPoint (Ng_Mesh * mesh, double * x);
\param pi Pointer to an array of integers containing the indices of the
points which constitute the surface element being added
*/
DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et, int * pi);
DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et, int * pi, int domain=1);
/*! \brief Add a volume element to a given Netgen Mesh Structure
@ -356,7 +361,7 @@ DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et
points which constitute the volume element being added
*/
DLL_HEADER void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et, int * pi);
DLL_HEADER void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et, int * pi, int domain=1);
// ------------------------------------------------------------------
@ -471,6 +476,12 @@ DLL_HEADER void Ng_RestrictMeshSizeBox (Ng_Mesh * mesh, double * pmin, double *
*/
DLL_HEADER Ng_Result Ng_GenerateVolumeMesh (Ng_Mesh * mesh, Ng_Meshing_Parameters * mp);
/*! \brief Improve quality of an existing 3D Volume Mesh
*/
DLL_HEADER Ng_Result Ng_OptimizeVolume(Ng_Mesh *mesh, Ng_Meshing_Parameters *mp);
// ------------------------------------------------------------------
@ -536,10 +547,10 @@ DLL_HEADER void Ng_GetPoint (Ng_Mesh * mesh, int num, double * x);
// return surface and volume element in pi
DLL_HEADER Ng_Surface_Element_Type
Ng_GetSurfaceElement (Ng_Mesh * mesh, int num, int * pi);
Ng_GetSurfaceElement (Ng_Mesh * mesh, int num, int * pi, int * domain = nullptr);
DLL_HEADER Ng_Volume_Element_Type
Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi);
Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi, int * domain = nullptr);
// ------------------------------------------------------------------
@ -554,7 +565,7 @@ Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi);
// feeds points and boundary to mesh
DLL_HEADER void Ng_AddPoint_2D (Ng_Mesh * mesh, double * x);
DLL_HEADER void Ng_AddBoundarySeg_2D (Ng_Mesh * mesh, int pi1, int pi2);
DLL_HEADER void Ng_AddBoundarySeg_2D (Ng_Mesh * mesh, int pi1, int pi2, int domain_in = -1, int domain_out = -1);
// ask for number of points, elements and boundary segments
DLL_HEADER int Ng_GetNP_2D (Ng_Mesh * mesh);
@ -566,10 +577,10 @@ DLL_HEADER void Ng_GetPoint_2D (Ng_Mesh * mesh, int num, double * x);
// return 2d elements
DLL_HEADER Ng_Surface_Element_Type
Ng_GetElement_2D (Ng_Mesh * mesh, int num, int * pi, int * matnum = NULL);
Ng_GetElement_2D (Ng_Mesh * mesh, int num, int * pi, int * matnum = nullptr);
// return 2d boundary segment
DLL_HEADER void Ng_GetSegment_2D (Ng_Mesh * mesh, int num, int * pi, int * matnum = NULL);
DLL_HEADER void Ng_GetSegment_2D (Ng_Mesh * mesh, int num, int * pi, int * matnum = nullptr);
// load 2d netgen spline geometry
@ -606,7 +617,7 @@ DLL_HEADER Ng_STL_Geometry * Ng_STL_NewGeometry ();
// normal vector may be null-pointer
DLL_HEADER void Ng_STL_AddTriangle (Ng_STL_Geometry * geom,
double * p1, double * p2, double * p3,
double * nv = NULL);
double * nv = nullptr);
// add (optional) edges :
DLL_HEADER void Ng_STL_AddEdge (Ng_STL_Geometry * geom,