ECE 4122/6122 Lab 3: OpenGL with OBJ files and Multiple Objects 
(100 pts) 
Category: 3D Graphics 
Due: Tuesday October 22th
, 2023 by 11:59 PM 

Objective: 
To create a dynamic 3D graphics application using lighting, shading, model transformations, and 
keyboard inputs. 
Description: 
You can use the code from tutorial09_Assimp to create a C++ application that loads in the obj files for 
the 3D chess pieces and the chess board. 
Modify the keyboard inputs so that (5 points each) 
1) ‘w’ key moves the camera radially closer to the origin. 
2) ‘s’ key moves the camera radially farther from the origin. 
3) ‘a’ key rotates the camera to the left maintaining the radial distance from the origin. 
4) ‘d’ key rotates to camera to the right maintaining the radial distance from the origin. 
5) The up arrow key radially rotates the camera up. 
6) The down arrow radially rotates the camera down. 
7) The ‘L’ key toggles the specular and diffuse components of the light on and off but leaves the 
ambient component unchanged. 
8) Pressing the escape key closes the window and exits the program 
Points grading: 
• 30 Points – loading obj files and displaying the chess pieces. 
• 30 Points – rotating and placing the chess pieces in the correct location and orientation 
• 40 Points – keyboard control described above 
• 5 pts extra credit the textures are applied correctly to the chess pieces and chessboard. 
• 5 pts extra credit make a short, narrated video of your program in action. (include it in the zip 
file) 
 Turn-In Instructions 
Create a Lab3 folder at the same level as the other tutorialxx _xx folders and place your code and the attached 
folders containing the obj file information in that folder. 
 
Modify the top level CMakeLists.txt file to build your Lab3 application. You can make any needed changes 
to the files in the common folder to handle the keyboard input. 
 
Zip up the folders Lab3 and common into Lab3.zip and upload this zip file on the assignment section of 
Canvas. When the TAs replace the existing folders with yours and the code should compile and run correctly. 
You can also include a short, narrated video of your program in action. 
 
Grading Rubric: 
If a student’s program runs correctly and produces the desired output, the student has the potential to get a 100 
on his or her homework; however, TA’s will look through your code for other elements needed to meet the lab 
requirements. The table below shows typical deductions that could occur. 
 
AUTOMATIC GRADING POINT DEDUCTIONS PER PROBLEM: 
Element Percentage 
Deduction 
 Details 
Does Not Compile 40% Code does not compile on PACE-ICE! 
Does Not Match Output Up to 90% The code compiles but does not produce correct outputs. 
Clear Self-Documenting 
Coding Styles 
Up to 25% This can include incorrect indentation, using unclear variable names, 
unclear/missing comments, or compiling with warnings. (See 
Appendix A) 
 
LATE POLICY 
Element Percentage Deduction Details 
Late Deduction Function score – 0.5 * H H = number of hours (ceiling function) passed 
deadline 
 Appendix A: Coding Standards 
Indentation: 
When using if/for/while statements, make sure you indent 4 spaces for the content inside those. Also make 
sure that you use spaces to make the code more readable. 
For example: 
for (int i; i < 10; i++) 
{ 
 j = j + i; 
} 
 
If you have nested statements, you should use multiple indentions. Each { should be on its own line (like the 
for loop) If you have else or else if statements after your if statement, they should be on their own line. 
for (int i; i < 10; i++) 
{ 
 if (i < 5) 
 { 
 counter++; 
 k -= i; 
 } 
 else 
 { 
 k +=1; 
 } 
 j += i; 
} 
 
Camel Case: 
This naming convention has the first letter of the variable be lower case, and the first letter in each new word 
be capitalized (e.g. firstSecondThird). 
This applies for functions and member functions as well! 
The main exception to this is class names, where the first letter should also be capitalized. 
Variable and Function Names: 
Your variable and function names should be clear about what that variable or function represents. Do not use 
one letter variables, but use abbreviations when it is appropriate (for example: “imag" instead of 
“imaginary”). The more descriptive your variable and function names are, the more readable your code will 
be. This is the idea behind self-documenting code. 
 File Headers: 
Every file should have the following header at the top 
/* 
Author: your name 
Class: ECE4122 or ECE6122 (section) 
Last Date Modified: date 
 
Description: 
 
What is the purpose of this file? 
 
*/ 
 
Code Comments: 
 
 1. Every function must have a comment section describing the purpose of the function, the input and 
output parameters, the return value (if any). 
2. Every class must have a comment section to describe the purpose of the class. 
3. Comments need to be placed inside of functions/loops to assist in the understanding of the flow of 
the code. 
 

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