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function mesh = fixpos(mesh, recurse)

% FIXPOS helper function to ensure that meshes are described properly

if nargin==1
  recurse = 1;
end

if isa(mesh, 'delaunayTriangulation')
  % convert to structure, otherwise the code below won't work properly
  ws = warning('off', 'MATLAB:structOnObject');
  mesh = struct(mesh);
  warning(ws);
end

if ~isa(mesh, 'struct')
  return;
end

if numel(mesh)>1
  % loop over all individual elements
  clear tmp
  for i=1:numel(mesh)
    % this is to prevent an "Subscripted assignment between dissimilar structures" error
    tmp(i) = fixpos(mesh(i));
  end
  mesh = tmp;
  clear tmp
  return
end

% convert from MATLAB delaunayTriangulation output to FieldTrip convention
if isfield(mesh, 'Points') && isfield(mesh, 'ConnectivityList')
  mesh.pos = mesh.Points;
  switch size(mesh.ConnectivityList,2)
    case 2
      mesh.edge = mesh.ConnectivityList;
    case 3
      mesh.tri = mesh.ConnectivityList;
    case 4
      mesh.tet = mesh.ConnectivityList;
    case 8
      mesh.hex = mesh.ConnectivityList;
    otherwise
      error('unsupported ConnectivityList')
  end % switch
  mesh = rmfield(mesh, {'Points', 'ConnectivityList', 'Constraints'});
end

% convert from BrainStorm/MNE to FieldTrip convention
if isfield(mesh, 'vertices') && isfield(mesh, 'faces')
  mesh.pos = mesh.vertices;
  mesh.tri = mesh.faces;
  mesh = rmfield(mesh, {'faces', 'vertices'});
elseif isfield(mesh, 'Vertices') && isfield(mesh, 'Faces')
  mesh.pos = mesh.Vertices;
  mesh.tri = mesh.Faces;
  mesh = rmfield(mesh, {'Faces', 'Vertices'});
end

% replace pnt by pos
if isfield(mesh, 'pnt')
  mesh.pos = mesh.pnt;
  mesh = rmfield(mesh, 'pnt');
end

if recurse<3
  % recurse into substructures, not too deep
  fn = fieldnames(mesh);
  fn = setdiff(fn, {'cfg'}); % don't recurse into the cfg structure
  for i=1:length(fn)
    if isstruct(mesh.(fn{i}))
      mesh.(fn{i}) = fixpos(mesh.(fn{i}), recurse+1);
    end
  end
end

	function mesh = fixpos(mesh, recurse)

	% FIXPOS helper function to ensure that meshes are described properly

	if nargin==1
	recurse = 1;
	end

	if isa(mesh, 'delaunayTriangulation')
	% convert to structure, otherwise the code below won't work properly
	ws = warning('off', 'MATLAB:structOnObject');
	mesh = struct(mesh);
	warning(ws);
	end

	if ~isa(mesh, 'struct')
	return;
	end

	if numel(mesh)>1
	% loop over all individual elements
	clear tmp
	for i=1:numel(mesh)
	% this is to prevent an "Subscripted assignment between dissimilar structures" error
	tmp(i) = fixpos(mesh(i));
	end
	mesh = tmp;
	clear tmp
	return
	end

	% convert from MATLAB delaunayTriangulation output to FieldTrip convention
	if isfield(mesh, 'Points') && isfield(mesh, 'ConnectivityList')
	mesh.pos = mesh.Points;
	switch size(mesh.ConnectivityList,2)
	case 2
	mesh.edge = mesh.ConnectivityList;
	case 3
	mesh.tri = mesh.ConnectivityList;
	case 4
	mesh.tet = mesh.ConnectivityList;
	case 8
	mesh.hex = mesh.ConnectivityList;
	otherwise
	error('unsupported ConnectivityList')
	end % switch
	mesh = rmfield(mesh, {'Points', 'ConnectivityList', 'Constraints'});
	end

	% convert from BrainStorm/MNE to FieldTrip convention
	if isfield(mesh, 'vertices') && isfield(mesh, 'faces')
	mesh.pos = mesh.vertices;
	mesh.tri = mesh.faces;
	mesh = rmfield(mesh, {'faces', 'vertices'});
	elseif isfield(mesh, 'Vertices') && isfield(mesh, 'Faces')
	mesh.pos = mesh.Vertices;
	mesh.tri = mesh.Faces;
	mesh = rmfield(mesh, {'Faces', 'Vertices'});
	end

	% replace pnt by pos
	if isfield(mesh, 'pnt')
	mesh.pos = mesh.pnt;
	mesh = rmfield(mesh, 'pnt');
	end

	if recurse<3
	% recurse into substructures, not too deep
	fn = fieldnames(mesh);
	fn = setdiff(fn, {'cfg'}); % don't recurse into the cfg structure
	for i=1:length(fn)
	if isstruct(mesh.(fn{i}))
	mesh.(fn{i}) = fixpos(mesh.(fn{i}), recurse+1);
	end
	end
	end