Method GetDirection

Interaction/Widgets/vtkBoxWidget.cxx:869–906

}

void vtkBoxWidget::GetDirection(
  const double Nx[3], const double Ny[3], const double Nz[3], double dir[3])
{
  double dotNy, dotNz;
  double y[3];

  if (vtkMath::Dot(Nx, Nx) != 0)
  {
    dir[0] = Nx[0];
    dir[1] = Nx[1];
    dir[2] = Nx[2];
  }
  else
  {
    dotNy = vtkMath::Dot(Ny, Ny);
    dotNz = vtkMath::Dot(Nz, Nz);
    if (dotNy != 0 && dotNz != 0)
    {
      vtkMath::Cross(Ny, Nz, dir);
    }
    else if (dotNy != 0)
    {
      // dir must have been initialized to the
      // corresponding coordinate direction before calling
      // this method
      vtkMath::Cross(Ny, dir, y);
      vtkMath::Cross(y, Ny, dir);
    }
    else if (dotNz != 0)
    {
      // dir must have been initialized to the
      // corresponding coordinate direction before calling
      // this method
      vtkMath::Cross(Nz, dir, y);
      vtkMath::Cross(y, Nz, dir);
    }
  }
}
void vtkBoxWidget::MovePlusXFace(double* p1, double* p2)
{
  double* pts = static_cast<vtkDoubleArray*>(this->Points->GetData())->GetPointer(0);