[vtkusers] Problem about vtkConnectivityFilter?

[zfjgo]

Hi,
   I want to render an object by volume rendering.And I need vtkConnectivityFilter to remove smallest unconnected objects.
The input of vtkConnectivityFilter is imagedata, the output is unstructuredgrid data, but the input of my "volumeMapper"(vtkVolumeRayCastMapper *volumeMapper) is imagedata.The following is the error:

error C2664: 'SetInput' : cannot convert parameter 1 from 'class vtkUnstructuredGrid *' to 'class vtkImageData *'


How to solve it?
Thanks
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