how to render brain surface file in unity?

Hello, i am trying to render a brain surface output by the popular neuroimaging software freesurfer:

http://www.grahamwideman.com/gw/brain/fs/surfacefileformats.htm

however, i have no idea which surface format to use (triangle, quadrangle, etc), or how to load these formats into unity, could someone please assist me in this?

i assume i probably need to convert the freesurfer output (once i decide which one to use) into one of the unity readable data formats : https://docs.unity3d.com/540/Documentation/Manual/HOWTO-importObject.html

and then load that file, and make it into a mesh that can be rendered.

anyone have any more ideas? thanks