Re: [Freesurfer] relationship between white and pial surfaces

Hi Satra,

sorry, there is no such easy relationship as the surfaces are not necessarily parallel. The vertex normals are the ccw cross product of the triangle legs, I believe (you should be able to load the ?h.sphere surface into matlab and check easily enough).

Bruce

On Mon, 31 May 2004, Satrajit Ghosh wrote:

Is there an easily quantifiable relationship between the white and pial surfaces? Such as:

pial_vertex = white_vertex + vertex_thickness*vertex_normal;

I understand that vertex_normals could be computed in different ways (Eg, Desbrun et al 2000). If so, could we find out which computation scheme is used (a reference would be sufficient)?

Thanks,

Satra