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: cgals2m.m
    path of file: ./repos/fecgsyn/subfunctions/data-generation/libs/iso2mesh
    
    the code of the file until where you have to start completion: function [node,elem,face]=cgals2m(v,f,opt,maxvol,varargin)
%
% [node,elem,face]=cgals2m(v,f,opt,maxvol)
%
% wrapper for CGAL 3D mesher (CGAL 3.5 and newer)
% convert a triangular surface to tetrahedral mesh
%
% http://www.cgal.org/Manual/3.5/doc_html/cgal_manual/Mesh_3/Chapter_main.html
%
% author: Qianqian Fang (fangq <at> nmr.mgh.harvard.edu)
%
% input:
%	 v: the node coordinate list of a surface mesh (nn x 3)
%	 f: the face element list of a surface mesh (be x 3)
%	 opt: parameters for CGAL mesher, if opt is a structure, then
%	     opt.radbound: defines the maximum surface element size
%	     opt.angbound: defines the miminum angle of a surface triangle
%	     opt.distbound: defines the maximum distance between the 
%		 center of the surface bounding circle and center of the 
%		 element bounding sphere
%	     opt.reratio:  maximum radius-edge ratio
%	     if opt is a scalar, it only specifies radbound.
%	 maxvol: target maximum tetrahedral elem volume
%
% output:
%	 node: output, node coordinates of the tetrahedral mesh
%	 elem: output, element list of the tetrahedral mesh, the last 
%	      column is the region id
%	 face: output, mesh surface element list of the tetrahedral mesh
%	      the last column denotes the boundary ID
%

    
function [node,elem,face]=cgals2m(v,f,opt,maxvol,varargin)
%
% [node,elem,face]=cgals2m(v,f,opt,maxvol)
%
% wrapper for CGAL 3D mesher (CGAL 3.5 and newer)
% convert a triangular surface to tetrahedral mesh
%
% http://www.cgal.org/Manual/3.5/doc_html/cgal_manual/Mesh_3/Chapter_main.html
%
% author: Qianqian Fang (fangq <at> nmr.mgh.harvard.edu)
%
% input:
%	 v: the node coordinate list of a surface mesh (nn x 3)
%	 f: the face element list of a surface mesh (be x 3)
%	 opt: parameters for CGAL mesher, if opt is a structure, then
%	     opt.radbound: defines the maximum surface element size
%	     opt.angbound: defines the miminum angle of a surface triangle
%	     opt.distbound: defines the maximum distance between the 
%		 center of the surface bounding circle and center of the 
%		 element bounding sphere
%	     opt.reratio:  maximum radius-edge ratio
%	     if opt is a scalar, it only specifies radbound.
%	 maxvol: target maximum tetrahedral elem volume
%
% output:
%	 node: output, node coordinates of the tetrahedral mesh
%	 elem: output, element list of the tetrahedral mesh, the last 
%	      column is the region id
%	 face: output, mesh surface element list of the tetrahedral mesh
%	      the last column denotes the boundary ID
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%

fprintf(1,'creating surface and tetrahedral mesh from a polyhedral surface ...\n');

exesuff=fallbackexeext(getexeext,'cgalpoly');

ang=30;
ssize=6;
approx=0.5;
reratio=3;

flags=varargin2struct(varargin{:});

if(~isstruct(opt))
	ssize=opt;
end