[vtkusers] vtkProcrustesAlignmentFilter error in centroid size

[David Netherway]

The procedure CentroidSize below returns the sum of the distances from
points to the centroid instead of the square root of the sum of squared
distances.
This is contrary to my understanding of the centroid size. Is this an error
or deliberate?

David Netherway

Module: $RCSfile: vtkProcrustesAlignmentFilter.cxx,v $

Date: $Date: 2003/03/11 15:19:30 $

Version: $Revision: 1.10 $

// Calculate the centroid size of a point cloud

static inline double CentroidSize(vtkPoints* pd, float *cp)

{

Centroid(pd, cp);


double S = 0;

for (int i = 0; i < pd->GetNumberOfPoints(); i++)

{

float *p = pd->GetPoint(i);


S += sqrt(vtkMath::Distance2BetweenPoints(p,cp));

}


return S;

}