[vtkusers] accelerated convert vtkImageData to vtkPoints

[qwcbeyond]

I use this method，but it's too slow.........help..... 
when I convert a 512*512*365 volume to vtkPoints,it takes several minutes.

   vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); 
  
  int subId, cellNum; 
double *paraCoords = new double[3]; 
double *xyzCoords  = new double[3]; 
double *vtkcellweights = new double[4]; 

int NumberOfImageDataVoxels=image->GetNumberOfPoints(); 

for (cellNum = 0; cellNum < NumberOfImageDataVoxels; cellNum++ ) 
{ 
subId = image->GetCell( cellNum )->GetParametricCenter(paraCoords); 
int &subIDadd = subId; 
image->GetCell(cellNum)->EvaluateLocation(subIDadd, paraCoords, 
xyzCoords, vtkcellweights); 

points->InsertNextPoint(xyzCoords); 

}

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