You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ft_interactiverealign.m
    path of file: ./repos/fieldtrip
    
    the code of the file until where you have to start completion: function [cfg] = ft_interactiverealign(cfg)

% FT_INTERACTIVEREALIGN allows the user to interactively translate, rotate and scale an
% individual geometrical object to a template geometrical object. It can for exam
    
function cb_camlight(h, eventdata)
fig = getparent(h);
delete(findall(fig, 'Type', 'light'));  % remove all existing lights
switch get(findall(fig, 'tag', 'camlightbtn'), 'value')
  case 1 % none
    lighting none
  case 2 % camlight
    lighting gouraud
    camlight
  case 3 % uniform
    lighting gouraud
    uniformlight
end