Method GenerateGhostArray

Common/DataModel/vtkExplicitStructuredGrid.cxx:548–640

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//------------------------------------------------------------------------------
void vtkExplicitStructuredGrid::GenerateGhostArray(int zeroExt[6], bool vtkNotUsed(cellOnly))
{
  int extent[6];
  this->Information->Get(vtkDataObject::DATA_EXTENT(), extent);

  this->AllocateCellGhostArray();
  this->AllocatePointGhostArray();

  bool sameExtent = true;
  for (int i = 0; i < 6; i++)
  {
    if (extent[i] != zeroExt[i])
    {
      sameExtent = false;
      break;
    }
  }
  if (sameExtent)
  {
    return;
  }

  vtkUnsignedCharArray* ghostCells = this->GetCellGhostArray();

  vtkIdType index = 0;

  // Loop through the cells in this image.
  // Cells may be 2d or 1d ... Treat all as 3D
  if (extent[0] == extent[1])
  {
    ++extent[1];
    ++zeroExt[1];
  }
  if (extent[2] == extent[3])
  {
    ++extent[3];
    ++zeroExt[3];
  }
  if (extent[4] == extent[5])
  {
    ++extent[5];
    ++zeroExt[5];
  }

  // Loop
  for (int k = extent[4]; k < extent[5]; ++k)
  { // Determine the Manhattan distances to zero extent.
    int dk = 0;
    if (k < zeroExt[4])
    {
      dk = zeroExt[4] - k;
    }
    if (k >= zeroExt[5])
    {
      dk = k - zeroExt[5] + 1;
    }
    for (int j = extent[2]; j < extent[3]; ++j)
    {