[vtkusers] vtkStructuredPointsWriter

[Ahmed Mahmoud]

Hello all,
I have 16 bit file , this is my pipeline

vtkVolume16Reader  reader
vtkStructuredPoints  sp
sp=reader->GetImage (1);

I want to use vtkStructuredPointsWriter to write to file

 vtkStructuredPointsWriter  writer
 writer->SetInput(sp);
 writer->SetFileName(filename);
 writer->Write ();

the result is a file 1 KB only .....  What is the wrong ??
Thank You.
Ahmed.