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: HELP_patch2obj.m
    path of file: ./repos/GIBBON/docs
    
    the code of the file until where you have to start completion: %% patch2obj
% Below is a demonstration of the features of the |patch2obj| function

%%
clear; close all; clc;

%% Syntax
% |patch2obj(objFileName,F,V);|
% |patch2obj(objFileName,F,V,C);|
% |patch2obj(objFileName,F,V,C,cMap);|
% |patch2obj(objFileName,F,V,C,cMap,cLim);|
% |patch2obj(objFileName,F,V,C,cMap,cLim,mtlStruct);|

%% Description
% This function exports the patch data defined by the faces (F), vertices
% (V) and the color data (C) to the OBJ (Wavefront .obj) format. The
% function generates a .obj file, a .mtl file, and a .jpg image file. The
% .obj file contains the geometry information and texture/color coordinates
% to use. The .mtl file contains the material information and refers to the
% image to use to look up the colors based on the texture coordinates in
% the .obj file. 
% The color data C should ideally define either the vertex or face c
    
function

%%
clear; close all; clc;

%% Syntax
% |patch2obj(objFileName,F,V);|
% |patch2obj(objFileName,F,V,C);|
% |patch2obj(objFileName,F,V,C,cMap);|
% |patch2obj(objFileName,F,V,C,cMap,cLim);|
% |patch2obj(objFileName,F,V,C,cMap,cLim,mtlStruct);|

%% Description
% This function exports the patch data defined by the faces (F), vertices
% (V) and the color data (C) to the OBJ (Wavefront .obj) format. The
% function generates a .obj file, a .mtl file, and a .jpg image file. The
% .obj file contains the geometry information and texture/color coordinates
% to use. The .mtl file contains the material information and refers to the
% image to use to look up the colors based on the texture coordinates in
% the .obj file. 
% The color data C should ideally define either the vertex or face colors
% in the form of an nx1 array. If face colors are provided these are
% re-sampled (averaged) to vertex colors which is the required format for
% OBJ files. Colors are obtained from the input color map as well as the
% color limits. The input structure mtlStruct defines the MTL file
% components. With the default entries: 
%
% mtlStruct.Ka=[1 1 1]; %Ambient color
% mtlStruct.Kd=[1 1 1]; %Diffuse color
% mtlStruct.Ks=[0 0 0]; %Specular color, black=off
% mtlStruct.Ns=0; %Specular component [0-1000]
% mtlStruct.Ni=1.45; %Optical density/index of refraction
% mtlStruct.d=1; %"dissolved"/transparancy [0-1]
% mtlStruct.Tr=0; %1 - d, used instead of d by some software
% mtlStruct.illum=1; %Illumination model
%
% Illumination models:
% 0. Color on and Ambient off
% 1. Color on and Ambient on
% 2. Highlight on
% 3. Reflection on and Ray trace on
% 4. Transparency: Glass on, Reflection: Ray trace on
% 5. Reflection: Fresnel on and Ray trace on
% 6. Transparency: Refraction on, Reflection: Fresnel off and Ray trace on
% 7. Transparency: Refraction on, Reflection: Fresnel on and Ray trace on
% 8. Reflection on and Ray trace off
% 9. Transparency: Glass on, Reflection: Ray trace off
% 10. Casts shadows onto invisible surfaces
%
%
% For more information on the OBJ file format see: 
% https://en.wikipedia.org/wiki/Wavefront_.obj_file
% http://paulbourke.net/dataformats/obj/minobj.html

%% EXAMPLES

clear; close all; clc;

%% Example 1: Export colored patch data to the OBJ format

%Define patch data 
testCase=1;
switch testCase
    case 1 %David
        [F,V]=graphicsModels(9);       
        t=V(:,1)-min(V(:,1));
        t=t./max(t(:));               
        C=sin(2*t*2*pi);
        C=abs(C);
        cMap=gjet(250); %Define colormap
    case 2
        [X,Y,Z]=peaks(25);
        [F,V,~]=grid2patch(X,Y,Z,Z);
        C=V(:,3);
        cMap=turbo(250); %Define colormap
    case 3 %Femur
        [F,V]=graphicsModels(5);        
        C=V(:,1); 
        cMap=turbo(250); %Define colormap
    case 4
        [F,V]=stanford_bunny; 
        C=V(:,1); 
        cMap=viridis(250); %Define colormap
end