[vtkusers] changes from 4.x to 5.x

[Dave Reed]

I'm getting back to using VTK after being gone for a while so I'm  
trying to adjust to some of the changes between 4.x and 5.x. At the  
moment, I have 5.0.3 on my Mac because that was the easiest to get  
working via MacPorts.

At the bottom of this message is some old Python code that worked on  
4.x and printed the number of polygons that were rendered. I've also  
tried updating the code to use the SetInputConnection and  
GetOutputPort methods, but that has no effect.

With 5.0.3 on my system, it says GetNumberOfPolys is not a valid  
attribute.

The output says it's a vtkPolyData, but the Python dir command doesn't  
list many of the vtkPolyData methods. Here is the output:

vtkPolyData
['AddObserver', 'BreakOnError', 'DebugOff', 'DebugOn', 'FastDelete',  
'GetAddressAsString', 'GetClassName', 'GetDebug',  
'GetGlobalWarningDisplay', 'GetMTime', 'GetReferenceCount',  
'GlobalWarningDisplayOff', 'GlobalWarningDisplayOn', 'HasObserver',  
'InvokeEvent', 'IsA', 'IsTypeOf', 'Modified', 'NewInstance',  
'PrintRevisions', 'Register', 'RemoveObserver', 'RemoveObservers',  
'SafeDownCast', 'SetDebug', 'SetGlobalWarningDisplay',  
'SetReferenceCount', 'UnRegister']

Shouldn't a vtkPolyData object have a GetNumberOfPolys attribute/ 
method (and many others that are missing.

Am I doing something wrong, or is something wrong with my installation  
or is this a bug in 5.0.3 or is something else wrong?

Thanks,
Dave


    # create the renderer and window
    ren = vtkRenderer()
    ren_win = vtkRenderWindow()
    ren_win.AddRenderer(ren)
    iren = vtkRenderWindowInteractor()
    iren.SetRenderWindow(ren_win)

    # read the volume
    reader = vtkImageReader()
    reader.SetDataExtent(0, 63, 0, 63, 1, 93)
    reader.SetDataByteOrderToLittleEndian()
    reader.SetFilePrefix(VTK_DATA + "/headsq/quarter")
    reader.SetDataSpacing(3.2, 3.2, 1.5)
    reader.SetDataScalarTypeToUnsignedShort()

    # extract the skin
    skin_extractor = vtkContourFilter()
    skin_extractor.SetInput(reader.GetOutput())
    skin_extractor.SetValue(0, 500)

    skin_mapper = vtkPolyDataMapper()
    skin_mapper.SetInput(skin_extractor.GetOutput())
    skin_mapper.ScalarVisibilityOff()
    skin_actor = vtkActor()
    skin_actor.SetMapper(skin_mapper)

    # create the outline
    outline = vtkOutlineFilter()
    outline.SetInput(reader.GetOutput())
    outline_mapper = vtkPolyDataMapper()
    outline_mapper.SetInput(outline.GetOutput())
    outline_actor = vtkActor()
    outline_actor.SetMapper(outline_mapper)
    outline_actor.GetProperty().SetColor(1,1,1)

    # Add the actors to the renderer
    ren.AddActor(outline_actor)
    ren.AddActor(skin_actor)
    ren.ResetCamera()
    ren_win.SetSize(300, 300)
    ren_win.Render()

    print skin_mapper.GetInput().GetClassName()
    print dir(skin_mapper.GetInput())
    print skin_mapper.GetInput().GetNumberOfPolys()

    iren.Start()