[vtkusers] how to get output from a vtkTransformFilter ?

[Emmanouil Moschidis]

Hi 
i am using a vtkTransformFilter to change the coordinates of some points. I apply the filter to the points and then i want to get the output but when the following line is executed: 

vtkPoints *Tdata=Tf->GetOutput()->GetPoints(); //Tf is the vtkTransformFilter 

i get this error:

ERROR: In /Users/antoinerosset/VTK/Filtering/vtkDemandDrivenPipeline.cxx, line 635 vtkStreamingDemandDrivenPipeline (0x17bc1e50): Algorithm vtkTransformFilter(0x1e61a790) did not create output for port 0 when asked by REQUEST_DATA_OBJECT and does not specify a concrete DATA_TYPE_NAME.


Does Anyone know what's wrong? Is there any other way of getting output (the modified points) from a vtkTransformFilter? 
thanks

       
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