Write vertex coordinates and vertex indices defining faces to a file in FreeSurfer ASCII surface format. For a subject (MRI image pre-processed with FreeSurfer) named 'bert', an example file would be 'bert/surf/lh.white.asc'.

write.fs.surface.asc(filepath, vertex_coords, faces)



string. Full path to the output surface file, should end with '.asc', but that is not enforced.


n x 3 matrix of doubles. Each row defined the x,y,z coords for a vertex.


n x 3 matrix of integers. Each row defined the 3 vertex indices that make up the face. WARNING: Vertex indices should be given in R-style, i.e., the index of the first vertex is 1. However, they will be written in FreeSurfer style, i.e., all indices will have 1 substracted, so that the index of the first vertex will be zero.


string the format that was written. One of "tris" or "quads". Currently only triangular meshes are supported, so always 'tris'.

See also


# \donttest{
    # Read a surface from a file:
    surface_file = system.file("extdata", "lh.tinysurface",
     package = "freesurferformats", mustWork = TRUE);
    mesh = read.fs.surface(surface_file);

    # Now save it:
    write.fs.surface.asc(tempfile(fileext=".asc"), mesh$vertices, mesh$faces);
# }