[vtkusers] Best practice with vtkAppendPolyData in a loop?

[Jeremie Papon]

Hey all,

What's the recommended best practice when appending inside of a loop with
vtkAppendPolyData? Searching the archives gives me conflicting information.
The following works for me, but I don't really like it. Is there a
cleaner/better way?
//////////////////////////////////////////
vtkSmartPointer<vtkExtractGeometry> extract_geometry =
vtkSmartPointer<vtkExtractGeometry>::New ();
extract_geometry->SetImplicitFunction (frustum);

vtkSmartPointer<vtkVertexGlyphFilter> glyph_filter =
vtkSmartPointer<vtkVertexGlyphFilter>::New ();
glyph_filter->SetInputConnection (extract_geometry->GetOutputPort ());

vtkSmartPointer<vtkAppendPolyData> append = vtkAppendPolyData::New ();

for (...)
{
 ...
  extract_geometry->SetInput (poly_data);

  vtkPolyData* selected = vtkPolyData::New ();
  glyph_filter->SetOutput (selected);
  glyph_filter->Update ();
  selected->SetSource (0);
  append->AddInput (selected);
}
append->Update ();
////////////////////////////////////////////////

If append only does a shallow copy, this seems like it should actually be
fairly efficient, right?
It also doesn't leak any memory as far as I can tell.

I just think it's kind of ugly...

Thanks for any help,

Jeremie Papon
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