[vtkusers] Saving a textured quad to file

[blitz]

Hi I am new to vtk and I'm using it mainly with PCL.
What i have with me is a quad(I'll have polygons later on) and a jpeg image
that goes on it as texture. I want to save that in say .ply format so that I
can use some tool like MeshLab to view it later on.

I had a look at the  http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/WritePLY
writePLY  tutorial. But they use a VtkSphereSource and then use 
plyWriter->SetInputConnection(sphereSource->GetOutputPort());

for the textured quads I am setting it up like the one in the 
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TextureMapQuad
example 

How can I connect the two and write the textured quad to the ply file? Is
there something like vtkSphereSource that I need to set up?

I am pretty sure there must be some way to do this. Can anyone please help
me out - or link me up with some existing examples?

Thanks a lot!

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