[vtkusers] peoblem with getting a point or cell from vtkImageData

[medo abdelmonem]

Hi Everybody,
   
  i'm operating on volume of type "vtkImageData" as an o/p of vtkVolume16Reader(or actually vtkDicomReader)....
   
  i need to get the coordinate of a point in the volume. typically decided to use the method "GetPoint()".....but when i tried to use it this error appeared on vtk output window (or at least that's a part of it)
   
  "error : requesting a point from an empty image"
   
  i did everything to work this out....even reforming this "vtkImageData" to "vtkStructuredPoints" using "vtkCastToConcrete" class....but the same error reappeared...
   
  here are some code snippets that illustrate how i got the vtk data and how i tried to get the point coordinates
  //////////////////////////////////////////////////////////////////////////////////////
  //Volume reader used to construct volume
  vtkVolume16Reader v16 = new vtkVolume16Reader();
  v16.SetDataDimensions(64, 64);
  v16.SetDataByteOrderToLittleEndian();
  v16.SetFilePrefix("D:/New Folder/vtk/vtkdata-5.0.2/VTKData/Data/headsq/quarter");
  v16.SetImageRange(1, 93);
  v16.SetDataSpacing(3.2, 3.2, 1.5);
  
  
  //////////////////////////////////////////////////////////////////////////////////////
  //an object of the class that Extract views....i pass the o/p of volume reader directly
  // it's of vtkImageData type
  Views N = new Views(v16.GetOutput(),v16.GetDataDimensions(),93);
  //////////////////////////////////////////////////////////////////////////////////////
  //here is the problem...when i try to get certain point (defined by its index)
  //coordinates and pass the o/p of this method to a reference...AND HERE I GET THE 
  //ERROR
  double [] x=Volume.GetPoint((32+2*64*64));
  //////////////////////////////////////////////////////////////////////////////////////
   
  thanks alot....and really sorry for your time....

 
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