示例#1
0
bool MeshProjection::bboxInsideRectangle(const Base::BoundBox3f& bbox,
                                         const Base::Vector3f& p1,
                                         const Base::Vector3f& p2,
                                         const Base::Vector3f& view) const
{
    Base::Vector3f dir(p2 - p1);
    Base::Vector3f base(p1), normal(view % dir);
    normal.Normalize(); 

    if (bbox.IsCutPlane(base, normal)) {
        dir.Normalize();
        Base::Vector3f cnt(bbox.GetCenter());

        return (fabs(cnt.DistanceToPlane(p1, dir)) +  fabs(cnt.DistanceToPlane(p2, dir))) <=
               (bbox.CalcDiagonalLength() + (p2 - p1).Length());
    }

    return false;
}
示例#2
0
void MeshGrid::CalculateGridLength (int iCtGridPerAxis)
{
  if (iCtGridPerAxis<=0)
  {
    CalculateGridLength(MESH_CT_GRID, MESH_MAX_GRIDS);
    return;
  }

  // Grid Laengen bzw. Anzahl der Grids pro Dimension berechnen
  // pro Grid sollen ca. 10 (?!?!) Facets liegen
  // bzw. max Grids sollten 10000 nicht ueberschreiten
  Base::BoundBox3f clBBMesh = _pclMesh->GetBoundBox();

  float fLenghtX = clBBMesh.LengthX();
  float fLenghtY = clBBMesh.LengthY();
  float fLenghtZ = clBBMesh.LengthZ();

  float fLenghtD = clBBMesh.CalcDiagonalLength();

  float fLengthTol = 0.05f * fLenghtD;

  bool bLenghtXisZero = (fLenghtX <= fLengthTol);
  bool bLenghtYisZero = (fLenghtY <= fLengthTol);
  bool bLenghtZisZero = (fLenghtZ <= fLengthTol);

  int iFlag  = 0;

  int iMaxGrids = 1;

  if (bLenghtXisZero)  
    iFlag += 1; 
  else
    iMaxGrids *= iCtGridPerAxis;

  if (bLenghtYisZero) 
    iFlag += 2;
  else
    iMaxGrids *= iCtGridPerAxis;

  if (bLenghtZisZero)
    iFlag += 4; 
  else
    iMaxGrids *= iCtGridPerAxis;
  
  unsigned long ulGridsFacets =   10;

  float fFactorVolumen = 40.0;
  float fFactorArea    = 10.0;

  switch (iFlag)
  {
  case 0:
    {
      float fVolumen = fLenghtX * fLenghtY * fLenghtZ;

      float fVolumenGrid = (fVolumen * ulGridsFacets) / (fFactorVolumen * _ulCtElements);

      if ((fVolumenGrid * iMaxGrids) < fVolumen)
        fVolumenGrid = fVolumen / (float)iMaxGrids;

      float fLengthGrid = float(pow((float)fVolumenGrid,(float) 1.0f / 3.0f));

      _ulCtGridsX = std::max<unsigned long>((unsigned long)(fLenghtX / fLengthGrid), 1);
      _ulCtGridsY = std::max<unsigned long>((unsigned long)(fLenghtY / fLengthGrid), 1);
      _ulCtGridsZ = std::max<unsigned long>((unsigned long)(fLenghtZ / fLengthGrid), 1);
      
    } break;
  case 1:
    {
      _ulCtGridsX = 1; // bLenghtXisZero
      
      float fArea = fLenghtY * fLenghtZ;

      float fAreaGrid = (fArea * ulGridsFacets) / (fFactorArea * _ulCtElements);

      if ((fAreaGrid * iMaxGrids) < fArea)
        fAreaGrid = fArea / (float)iMaxGrids;

      float fLengthGrid = float(sqrt(fAreaGrid));

      _ulCtGridsY = std::max<unsigned long>((unsigned long)(fLenghtY / fLengthGrid), 1);
      _ulCtGridsZ = std::max<unsigned long>((unsigned long)(fLenghtZ / fLengthGrid), 1);
    } break;
  case 2:
    {
      _ulCtGridsY = 1; // bLenghtYisZero
  
      float fArea = fLenghtX * fLenghtZ;

      float fAreaGrid = (fArea * ulGridsFacets) / (fFactorArea * _ulCtElements);

      if ((fAreaGrid * iMaxGrids) < fArea)
        fAreaGrid = fArea / (float)iMaxGrids;

      float fLengthGrid = float(sqrt(fAreaGrid));

      _ulCtGridsX = std::max<unsigned long>((unsigned long)(fLenghtX / fLengthGrid), 1);
      _ulCtGridsZ = std::max<unsigned long>((unsigned long)(fLenghtZ / fLengthGrid), 1);
    } break;
  case 3:
    {
      _ulCtGridsX = 1; // bLenghtXisZero
      _ulCtGridsY = 1; // bLenghtYisZero
      _ulCtGridsZ = iMaxGrids; // bLenghtYisZero
    } break;
  case 4:
    {
      _ulCtGridsZ = 1; // bLenghtZisZero
      
      float fArea = fLenghtX * fLenghtY;

      float fAreaGrid = (fArea * ulGridsFacets) / (fFactorArea * _ulCtElements);

      if ((fAreaGrid * iMaxGrids) < fArea)
        fAreaGrid = fArea / (float)iMaxGrids;

      float fLengthGrid = float(sqrt(fAreaGrid));

      _ulCtGridsX = std::max<unsigned long>((unsigned long)(fLenghtX / fLengthGrid), 1);
      _ulCtGridsY = std::max<unsigned long>((unsigned long)(fLenghtY / fLengthGrid), 1);
    } break;
  case 5:
    {
      _ulCtGridsX = 1; // bLenghtXisZero
      _ulCtGridsZ = 1; // bLenghtZisZero
      _ulCtGridsY = iMaxGrids; // bLenghtYisZero
    } break;
  case 6:
    {
      _ulCtGridsY = 1; // bLenghtYisZero
      _ulCtGridsZ = 1; // bLenghtZisZero
      _ulCtGridsX = iMaxGrids; // bLenghtYisZero
    } break;
  case 7:
    {
      _ulCtGridsX = iMaxGrids; // bLenghtXisZero
      _ulCtGridsY = iMaxGrids; // bLenghtYisZero
      _ulCtGridsZ = iMaxGrids; // bLenghtZisZero
    } break;
  }
}