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: gridify.m
    path of file: ./repos/mtex/geometry/@vector3d
    
    the code of the file until where you have to start completion: function [vecG,weightsG,id] = gridify(vec,varargin)
% approximate a list of vectors with vectors on a grid
%
% Syntax
%   [vecG, weightsG, id] = gridify(vec)
%   [vecG, weightsG, id] = gridify(vec,'weights',weights)
%
% Input
%  vec - @vector3d
%
% Output
%  vGrid   - @S2Grid
%  weightsG - double
%  id    - 
%
% Options
%  weights    - 
%  resolution -

    
function [vecG,weightsG,id] = gridify(vec,varargin)
% approximate a list of vectors with vectors on a grid
%
% Syntax
%   [vecG, weightsG, id] = gridify(vec)
%   [vecG, weightsG, id] = gridify(vec,'weights',weights)
%
% Input
%  vec - @vector3d
%
% Output
%  vGrid   - @S2Grid
%  weightsG - double
%  id    - 
%
% Options
%  weights    - 
%  resolution -
%  

weights = get_option(varargin,'weights',ones(size(vec)));

% generate grid of vectors
if vec.antipodal, aP = {'antipodal'}; else, aP = {}; end