[Freesurfer] Export Functional Data Overlayed Onto Sphere

Hello,

I've specifically adopted Freesurfer for its ability to map a brain into a sphere. I've ran a subject's structural data through the recon-all pipeline using the -all option. With this reconstruction completed, I'd like to overlay functional data on the sphere. More specifically, I'd like the ability to programmatically query a point on the sphere and get the corresponding activation. Is there a reasonable way to do this within the Freesurfer pipeline? I already have the ability to programmatically query my initial functional data, so it would suffice to get a transformation matrix from my structural data to the spherical coordinates. Any thoughts/suggestions would be appreciated.

Regards, Luis Piloto