Method Reduce

Common/DataModel/vtkPlane.cxx:515–527

Compose the coordinate sums and then average them (to compute the origin).

  // Compose the coordinate sums and then average them (to
  // compute the origin).
  void Reduce()
  {
    double sum[3] = { 0, 0, 0 };
    auto iEnd = this->Sum.end();
    for (auto itr = this->Sum.begin(); itr != iEnd; ++itr)
    {
      vtkMath::Add(sum, (*itr).data(), sum);
    }

    vtkIdType npts = this->Points->GetNumberOfPoints();
    vtkMath::Add(this->Origin, sum, this->Origin);
    vtkMath::MultiplyScalar(this->Origin, (1.0 / npts));
  }
};

// Determine the points covariance matrix