More Pythonic VTK wrapping

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Overall I haven’t seen any difficulties doing the conversions to the new VTK Python API.
My impression is that the code is more compact and much easier to read.

However … I started doing the more complex examples and came across this when updating PBR_Skybox:

I can update this function to:

def read_cubemap(cubemap):
    cube_map = vtkTexture(cube_map=True, mipmap=True, interpolate=True)

    flipped_images = list()
    for fn in cubemap:
        reader_factory = vtkImageReader2Factory()
        img_reader = reader_factory.CreateImageReader2(str(fn))
        img_reader.file_name = str(fn)
        flip = vtkImageFlip(filtered_axis=1)
        img_reader >> flip
        flipped_images.append(flip)

    for i in range(0, len(flipped_images)):
        cube_map.SetInputConnection(i, flipped_images[i].GetOutputPort())
    return cube_map

Which works fine. However, thinking along the lines of vtkAppendFilter, is it possible to modify vtkTexture so that:

    flipped_images >> cube_map

works? To me SetInputConnection(i,...) is working in the same way as the input to vtkAppendFilter. Of course this assumes that the image files making up the cube map are already ordered as [right, left, top, bottom, front, back] or [+x, -x, +y, -y, +z, -z].

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