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I am having some issues projecting retinotopic mapping data from a monkey
analyzed in surface space onto its surface using rtview. The issue seems to
be that the data need to be converted into paint format through
mri_surf2surf, and that we do not have a ?h.sphere.reg file because the
surface is not aligned to a template.
Is it possible to run mri_surf2surf without reference to ?h.sphere.reg
somehow? I tried with --s instead of source and target subject, but that
didn't work.
Alternatively, can we provide an identity matrix for ?h.sphere.reg, perhaps
through mris_register?

Any advice would be appreciated.
Thanks, Caspar
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