MeshVizXLM/extractors/MxHexahedron20CellExtract.h

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/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
#ifndef  _MxHexahedron20CellExtract_h
#define  _MxHexahedron20CellExtract_h

#include <MeshVizXLM/mesh/geometry/MiGeometryI.h>

#include <Inventor/STL/vector>
#include <Inventor/STL/utility>

class MiVolumeCell;

class MESHIVIZ_API MxHexahedron20CellExtract 
{
public:

  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);

  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 size_t getNodesIndexOfFacet (size_t facet, std::vector<size_t>& facetNodes)
  {
    facetNodes.assign(s_facetNode[facet],s_facetNode[facet]+4);
    return 4;
  }

  static size_t getSubTriangleNodesIndex(size_t face, std::vector<size_t>& triangleNodeIds)  
  {
    triangleNodeIds.assign(s_subFacetNode[face],s_subFacetNode[face]+18);
    return 6;
  }

  static size_t getSubTetrahedronNodesIndex (std::vector<size_t>& tetrahedronNodeIds)
  {
    tetrahedronNodeIds.assign(s_subTetrahedronNodeIds,s_subTetrahedronNodeIds+88);
    return 22;
  }


private:
  static void get20Derivs(double r, double s, double t, size_t numNodes, std::vector<double>& derivs);

private:

  static bool initClass();
  static void exitClass();

  static bool   s_isInit;
  static double s_nodesIsoParametricCoords[20][3];
  static size_t s_subFacetNode[6][18];
  
  static size_t s_subTetrahedronNodeIds[22*4]; // an hexa20 is split into 22 tetras
  static size_t s_symetricByFace_16_17_18_19[20];

  static size_t s_facetNode[6][4];
};

#endif 

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