Hi-

This is probably not the most elegant way to visualize the results, but this works.

The spec file is used to define various states and groups of surfaces to view together. Here, I've made a spec file to view the L- and R- hemispheres of smoothed WM from the standard TT template set along with your *.py file in the same space. Because of path oddness within the spec file, you will have to copy some files from the suma_TT_N27 file to your working directory that contains your chosen file of interest (ply_paths.ply).

So, this will copy the two surfaces and their node labels to your 'current' directory:

$ cp ~/.afni/data/suma_TT_N27/?h.smoothwm.gii .
$ cp ~/.afni/data/suma_TT_N27/?h.aparc.a2009s.annot.niml.dset .

You should then open a blank text file in your current working directory, copy and paste the following there, and then save it as "COMBO.spec":

        Group = TT_N27_plus

        StateDef = smoothwm_plus

NewSurface
        SurfaceFormat = ASCII
        SurfaceType = GIFTI
        SurfaceName = lh.smoothwm.gii
        LocalDomainParent = SAME
        SurfaceState = smoothwm_plus
        EmbedDimension = 3
        Anatomical = Y
        LabelDset =  lh.aparc.a2009s.annot.niml.dset

NewSurface
        SurfaceFormat = ASCII
        SurfaceType = GIFTI
        SurfaceName = rh.smoothwm.gii
        LocalDomainParent = SAME
        SurfaceState = smoothwm_plus
        EmbedDimension = 3
        Anatomical = Y
        LabelDset =  rh.aparc.a2009s.annot.niml.dset

NewSurface
        SurfaceFormat = ASCII
        SurfaceType = Ply
        SurfaceName = ply_paths.ply
        LocalDomainParent = SAME
        SurfaceState = smoothwm_plus
        EmbedDimension = 3
        Anatomical = Y

Now, you are all set to go. You can open/view this as:

$ suma -spec COMBO.spec &

and/or you could add '-vol SOME_FILE' to this if you wanted to view a volume file additionally.

Here are a couple of (hopefully viewable) screenshots, one showing the "walnut brain"ability of opening the smooth WM cortices, and the other of using CTRL+o to turn the smooth WM cortices semi-transparent:
[afni.nimh.nih.gov]
[afni.nimh.nih.gov]

--pt