Hi Alain,

Did you use "-oob_value 0" in the 3dVol2Surf command?
If not, the results might have different nodes across
subjects.

Apart from that, how are you seeing a registration
problem between the surface and the results? It is
not clear to me how you would even know. Can you be
specific about how you are visualizing such a thing?

Note that 3dttest++ does not do anything to the node
locations. It merely computes some result on the set
of nodes that was given as input. There should not
be any registration question as a result.

Also, the 3dttest++ results should display similarly
on each subject's surface, though each will have a
different distortion, based on registration to the
surface template.

As far as using suma goes, I will leave that for others.
But please provide the output of "afni -ver", in case it
matters.

- rick