[vtkusers] How to create a VTK Filter?

[Renato Rodrigues]

Hi vtkusers!

I found some trouble when trying to create a Filter using Visual C++.

I'm trying to create a subclass of vtkPolyDatatoPolyDataFilter that
will receive a PolyData as input and generate another PolyData with
only Vertices cells as output.

In my subclass I only wrote the the methods *New, the Counstructor,
Destructor and Execute.

Did I forget something? The program crashes when I try to use this filter.
Could somebody tell me the steps to create a filter?

Thanks. (sorry about my English :-P)