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If I load, say, orig.mgz and lh.pial, in FreeView and lay my cursor on a point, I can see  RAS (and surfaceRAS) as well as TKReg RAS (orig) coordinates.  Following the steps laid out on the CoordinateSystems web page I can convert back and forth between those coordinate systems.  However, I can't figure out what I need to do to calculate the Vertex coordinates.  I can load lh.pial in matlab and see the (+1) vertex number and coordinates, but I'd like to figure out the best way to get from Vertex x/y/z to TkReg RAS or SurfaceRAS.  Is there an easy formula to calculate this?  Thanks in advance for any and all responses.

-Joel

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