MeshVizXLM/extractors/MxTriangle6CellExtract.h

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/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
#ifndef  _MxTriangle6CellExtract_h
#define  _MxTriangle6CellExtract_h

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

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

class MiSurfaceCell;

class MESHIVIZ_API MxTriangle6CellExtract 
{
public:

  static MbVec3d getIsoParametricCoord(const MiGeometryI& meshGeometry, const MiSurfaceCell* triangleCell, const MbVec3d &point);
  
  static MbVec3d getIsoParametricCoord(size_t nodeIndex)
  {
    return MbVec3d(s_nodesIsoParametricCoords[nodeIndex]);
  }

  static void getWeight(const MiGeometryI& meshGeometry, const MiSurfaceCell* triangleCell, const MbVec3d &point, std::vector<double>& weights)
  {
    getWeight(getIsoParametricCoord(meshGeometry,triangleCell,point),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 MiSurfaceCell* triangleCell, const MbVec3d &point, std::vector<double>& weights)
  {
    MbVec3d pcoord = getIsoParametricCoord(meshGeometry,triangleCell,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[0]+pcoord[1]) &&  (pcoord[0]+pcoord[1]) < 1 + 1.E-5);
    if (inside)
      getWeight(pcoord,weights);
    return inside;
  }

  static size_t getSubTriangleNodesIndex (std::vector<size_t>& triangleNodeIds)
  {
    triangleNodeIds.assign(s_subTriangleNodeIds,s_subTriangleNodeIds+(4*3));
    return 4;
  }

  friend std::ostream& operator << (std::ostream& s, const MxTriangle6CellExtract& cell);

private:
  static double s_nodesIsoParametricCoords[6][3];
  static size_t s_subTriangleNodeIds[4*3];
};

//-----------------------------------------------------------------------------
inline void
MxTriangle6CellExtract::getWeight(const MbVec3d &ipcoord, std::vector<double>& weight)
{
  double r = ipcoord[0];
  double s = ipcoord[1];
  weight[0] = (1-r-s) * ( 2*(1-r-s)-1 );
  weight[1] = r * (2*r-1);
  weight[2] = s * (2*s-1);
  weight[3] = 4 * r * (1-r-s);
  weight[4] = 4 * r * s;
  weight[5] = 4 * s * (1-r-s);
}


#endif 

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