[vtkusers] labelling axes

[dgillard at pangeosubsea.com]

Hi vtkers,

I've got 3 vtkImagePlaneWidgets used for volume rendering, normal to x, y,
z axes as you'd expect.

I'd like to label the ends of the axes -x, +x, -y, +y, -z, +z, but I'm
having some trouble doing so. Can someone give me an idea of how best to
do this?

thanks in advance.