Scanned face file(*.wrl)
File format : VRML ver 1.0(Virtual Reality Modeling Language ver1.0)

Fit scanned face to the surface which is extracted from MRI and 
get transform matrix from stylus coordinate to MRI coordinate.
The coordinate system of the scanned face and the stylus must be the same.


<<MRI>>     <<DIGITIZER>>    <<MEG>>
FACE      <-- FACE
FIDUCIALS <-- FIDUCIALS
              MARKERS   <--  MARKERS(for each session)

          2nd step      3rd step
