Method CheckIntersection

Filters/HyperTree/vtkHyperTreeGridPlaneCutter.cxx:732–755

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bool vtkHyperTreeGridPlaneCutter::CheckIntersection(double cellCoords[8][3], double functEval[8])
{
  // Iterate over cell vertices
  int i;
  for (i = 0; i < 8; ++i)
  {
    // Evaluate the plane in every coordinate
    functEval[i] = cellCoords[i][0] * this->Plane[0] + cellCoords[i][1] * this->Plane[1] +
      cellCoords[i][2] * this->Plane[2] - this->Plane[3];
  } // i

  // Evaluate plane equation at first corner
  double firstVal = functEval[0];

  // Check if there is any sign change
  i = 7;
  while (i && functEval[i] * firstVal > 0.)
  {
    --i;
  }

  // Intersection if while statement broke early
  return (i != 0);
}

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bool vtkHyperTreeGridPlaneCutter::CheckIntersection(double cellCoords[8][3])