[vtkusers] vtkimages in tk

[dgillard at pangeosubsea.com]

I would like to render some vtkimages and position them in the same
window, but positioned in different frames, using tk. The only way I can
think of doing this is by saving them first as tiff images using the
vtkTiffWriter, and then treating them as photos on the tk side.

Please, does anyone know a nicer way of doing this?