[vtkusers] Convert vtkImageData to vtkAlgorithmOutput type

[Arefin Shamsil]

Hi,
I am trying to combine a vtkImageData image and its transform
using vtkTransformPolyDataFilter. Here is my setup

vtkSmartPointer<vtkTransformPolyDataFilter> imagePose =
itkSmartPointer<vtkTransformPolyDataFilter>::New();

imagePose->SetInputConnection(image); // image is of vtkImageData -----
error is here
imagePose->SetTransform(imageTransform);

Problem is SetInputConnection is not accepting vtkImageData type, it only
accepts vtkAlgorithmOutput type.

I am not really sure what to do here. Online search has not been of much
help. Is there any way to do it?
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