[vtkusers] scaling polydata

[Majid Mohammad sadeghi]

Dear All,
When I scale a polydata by a uniform scale like: (2,2,2) , the data aslo moves a bit towards a direction depending on where the origin is located in relation to the polydata. 
Is there a way to make the scaling transformation work as if each surface is moved relative to its normal? (I want an effect like an offset of the shape)

I know there is vtkwarpvector but I can not give its output to a plydata. (or maybe I am wrong!)
Any help?

Thanks.
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