MxHexahedronCellExtract.h

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**=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
#ifndef  _MxHexahedronCellExtract_h
#define  _MxHexahedronCellExtract_h
 
#include <MeshVizXLM/mesh/geometry/MiGeometryI.h>
 
#include <Inventor/STL/vector>
#include <Inventor/STL/utility>
 
class MxTabOfMarchingCase;
class MiVolumeCell;
 
class MESHVIZXLM_EXTR_API MxHexahedronCellExtract 
{
public:
 
  static void getIsosurfTopology(unsigned char caseId, std::vector< std::pair<size_t,size_t> >& edgeList );
 
  static MbVec3d getIsoParametricCoord(const MiGeometryI& meshGeometry, const MiVolumeCell* hexahedronCell, const MbVec3d &point);
  
  static MbVec3d getIsoParametricCoord(size_t nodeIndex);
 
  static void getWeight(const MiGeometryI& meshGeometry, const MiVolumeCell* hexahedronCell, const MbVec3d &point, std::vector<double>& weights)
  {
    MbVec3d ipcoord = getIsoParametricCoord(meshGeometry,hexahedronCell,point);
    getWeight(ipcoord,weights);
  }
 
  static void getWeight(const MbVec3d &ipcoord, std::vector<double>& weights)
  {
    double rm, sm, tm;
 
    rm = 1. - ipcoord[0];
    sm = 1. - ipcoord[1];
    tm = 1. - ipcoord[2];
 
    weights[0] = rm*sm*tm;
    weights[1] = ipcoord[0] * sm * tm;
    weights[2] = ipcoord[0]*ipcoord[1] * tm;
    weights[3] = rm * ipcoord[1] * tm;
    weights[4] = rm * sm * ipcoord[2];
    weights[5] = ipcoord[0] * sm * ipcoord[2];
    weights[6] = ipcoord[0] * ipcoord[1] * ipcoord[2];
    weights[7] = rm * ipcoord[1] * ipcoord[2];
  }
 
  static void getDerivs(const MbVec3d &ipcoord, std::vector<double>& derivs);
 
  static bool isPointInsideCell(const MiGeometryI& meshGeometry, const MiVolumeCell* hexahedronCell, const MbVec3d &point, std::vector<double>& weights)
  {
    MbVec3d pcoord = getIsoParametricCoord(meshGeometry,hexahedronCell,point);
    bool inside = ( -1.E-5 < pcoord[0] &&  pcoord[0] < 1 + 1.E-5 &&
                    -1.E-5 < pcoord[1] &&  pcoord[1] < 1 + 1.E-5 &&
                    -1.E-5 < pcoord[2] &&  pcoord[2] < 1 + 1.E-5 );
    if (inside)
      getWeight(pcoord,weights);
    return inside;
  }
 
  static double getVolume(const MiGeometryI& meshGeometry, const MiVolumeCell* hexahedronCell);
 
  static MbVec3d getFacetNormal(size_t facetId, const MiGeometryI& meshGeometry, const MiVolumeCell* pyramidCell);
 
  static double getLongestEdgeLength(const MiGeometryI& meshGeometry, const MiVolumeCell* cell);
 
  static double getShortestEdgeLength(const MiGeometryI& meshGeometry, const MiVolumeCell* cell);
 
private:
 
  static bool initClass();
  static void exitClass();
 
  static void initMarchingCase0();
  static void initMarchingCase1();
  static void initMarchingCase2();
  static void initMarchingCase3();
  static void initMarchingCase4();
  static void initMarchingCase5();
  static void initMarchingCase6();
  static void initMarchingCase7();
  static void initMarchingCase8();
  static void initMarchingCase9();
  static void initMarchingCase10();
  static void initMarchingCase11();
  static void initMarchingCase12();
  static void initMarchingCase13();
  static void initMarchingCase14();
 
  static bool            s_isInit;
  static MxTabOfMarchingCase* s_tabOfMarchingCube;
  static double s_nodesIsoParametricCoords[8][3];
 
};
 
#endif