[vtkusers] Distance between 2 points in millimeters (mm)

[Concetta Piazzese]

Hy everyone. I hope somebody can help me!
I need to find the distance between 2 points in millimeters like the vtkDistanceWidget does. An user places 10 points and then the program compute the distances. The problem is that I have an array of vtkPoints and I can't use vtkDistanceWidget to find the distances. How I can find the distance? The points positions are inglobal coordinate values. The distance I got are totally wrong. Here is my code: 

int main(int argc, char *argv[])
{
    reader->SetFileName("C:/Tesi/DistanceBetween2Points_build/Debug/Data/Plaque_08.mhd");
    reader->Update(); 

    imgconn=reader->GetOutput();

    //Points Placement with vtkSeedWidget. Poins are stored in a vtkPoints called "points"
    Seed();

    double punto[3];
    double punto2[3];

    int num=points->GetNumberOfPoints();

    for (int i=0; i<num; i++)
    {     
    points->GetPoint(num-1,punto);
    points->GetPoint(num,punto2);

    double squaredDistance;
    double dist;

    // Distance
    squaredDistance = vtkMath::Distance2BetweenPoints(punto, punto2);
    dist=sqrt(squaredDistance);
    
    std::cout << "Distance " << dist << std::endl;
 
     }

    return EXIT_SUCCESS;
}

What's the problem? vtkDistanceWidget computes distances using vtkMath::Distance2BetweenPoints. So what am I doing wrong?
Thank you!
 		 	   		  
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