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: polygonize.m
    path of file: ./repos/gptoolbox/mesh
    
    the code of the file until where you have to start completion: function [CV,CE,I,CN,GD,D] = polygonize(V,F,fun,varargin)
  % Polygonize (contour) an implicit function in the spirit of "An Implicit
  % Surface Polygonizer" [Bloomenthal 1994]
  %
  % [CV,CE] = polygonize(V,F,fun)
  %
  % Inputs:
  %   V  #V by dim list of vertex positions of original mesh
  %   F  #F by dim+1 list of element indices into V
  %   fun  function handle so that zero is the desired level set
  % Outputs:
  %   CV  #CV by dim list of contour mesh vertices 
  %   CE  #CE by dim list of facet indices into CV
  %   I  #CE list of indices into F
  %   CN  #CN by dim list of unit normal vectors at vertices
  %

  % default values
  delta = [];
  % Map of parameter names to variable names
  params_to_variables = containers.Map( ...
    {'Delta'}, ...

    
function [CV,CE,I,CN,GD,D] = polygonize(V,F,fun,varargin)
  % Polygonize (contour) an implicit function in the spirit of "An Implicit
  % Surface Polygonizer" [Bloomenthal 1994]
  %
  % [CV,CE] = polygonize(V,F,fun)
  %
  % Inputs:
  %   V  #V by dim list of vertex positions of original mesh
  %   F  #F by dim+1 list of element indices into V
  %   fun  function handle so that zero is the desired level set
  % Outputs:
  %   CV  #CV by dim list of contour mesh vertices 
  %   CE  #CE by dim list of facet indices into CV
  %   I  #CE list of indices into F
  %   CN  #CN by dim list of unit normal vectors at vertices
  %

  % default values
  delta = [];
  % Map of parameter names to variable names
  params_to_variables = containers.Map( ...
    {'Delta'}, ...
    {'delta'});
  v = 1;
  while v <= numel(varargin)
    param_name = varargin{v};
    if isKey(params_to_variables,param_name)
      assert(v+1<=numel(varargin));
      v = v+1;
      % Trick: use feval on anonymous funtion to use assignin to this workspace
      feval(@()assignin('caller',params_to_variables(param_name),varargin{v}));
    else
      error('Unsupported parameter: %s',varargin{v});
    end