ft_defacemesh.m

function mesh = ft_defacemesh(cfg, mesh)

% FT_DEFACEMESH allows you to de-identify a scalp surface mesh by erasing specific
% regions, such as the face and ears. The interactive graphical user interface allows
% you to position a box over the anatomical data inside which all vertices will be
% removed. You might have to call this function multiple times when both face and
% ears need to be removed. Following defacing, you should check the result with
% FT_PLOT_MESH.
%
% Use as
%   mesh = ft_defacemesh(cfg, mesh)
%
% The configuration can contain the following options
%   cfg.method     = string, specification of the shape that is used 
%                    as a boundary for exclusion, can be either 'box' or 'plane' (default = 'box')
%   cfg.translate  = initial position of the center of the box, or a point on the plane (default = [0 0 0])
%   cfg.scale      = initial size of the box along each dimension (default is automatic)
%   cfg.rotate     = initial rotation of the box, or the plane (default = [0 0 0])
%   cfg.selection  = which vertices to keep, can be 'inside' or 'outside' (default = 'outside')
%
% See also FT_ANONYMIZEDATA, FT_DEFACEVOLUME, FT_ANALYSISPIPELINE, FT_PLOT_MESH

% Copyright (C) 2015-2024, Robert Oostenveld and Jan-Mathijs Schoffelen 
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id$

% these are used by the ft_preamble/ft_postamble function and scripts
ft_revision = '$Id$';
ft_nargin   = nargin;
ft_nargout  = nargout;

% do the general setup of the function
ft_defaults
ft_preamble init
ft_preamble debug
ft_preamble loadvar    mesh
ft_preamble provenance mesh

% the ft_abort variable is set to true or false in ft_preamble_init
if ft_abort
  return
end

% the actual work is done by FT_DEFACEVOLUME
tmpcfg = cfg;
tmpcfg.showcallinfo = 'no';
mesh = ft_defacevolume(tmpcfg, mesh);
% remember the output rotate, scale and translate
rotate    = mesh.cfg.rotate;
scale     = mesh.cfg.scale;
translate = mesh.cfg.translate;
% restore provenance information and put back cfg.callinfo
tmpcallinfo = cfg.showcallinfo;
[cfg, mesh] = rollback_provenance(cfg, mesh);
% store these in the output configuration
cfg.showcallinfo = tmpcallinfo;
cfg.rotate       = rotate;
cfg.scale        = scale;
cfg.translate    = translate;

% do the general cleanup and bookkeeping at the end of the function
ft_postamble debug
ft_postamble previous mesh
ft_postamble provenance mesh
ft_postamble history mesh
ft_postamble savevar mesh