[vtkusers] how can I get a cylinder whose middle par t is thinner than the end

[worchin]

maybe it looks like this
 
 
    |-------|                  |------|
    |       |                   \    / 
    |       |   --->             |  |   
    |       |                   /    \
    |       |                  |------|
    |-------|
can vtkWarpTransform help to solve this question? 
thanks
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