[vtkusers] building vtkPolyData in a function and return it

[chrisyeshi]

What I am trying to do is to make a vtkpolydata in a function, and then apply
some sort of filter, and then return the vtkpolydata.

the actual code would look something like this:

vtkPolyData *poly1 = vtkPolyData::New();
// generate poly1 here
vtkPolyData *poly2 = vtkPolyData::New();
// generate poly2 here
vtkAppendPolyData *append = vtkAppendPolyData::New();
vtkPolyData *result = append->GetOutput();     // I tried deepcopy here, but
it doesn't work.

append->Delete();                                        // If I do not
delete these, it works, but memory leaks
poly2->Delete();
poly1->Delete();

return result;
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