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Project 3 (Final Project, Part I) 
https://canvas.wpi.edu/courses/20567/assignments/136970[2020/6/23 2:38:33] 
CS4731_543-E20  
Project 3 (Final Project, Part I) 
Due Thursday by 11:59pm Points 100 Submitting a file upload File Types zip 
Available Jun 9 at 10am - Jul 2 at 6am 23 days 
Submit Assignment 
Demo Video (no audio) 
Optional sphere.ply file: sphere.ply 
Overview: 
In this project, we will explore hierarchical modeling of 3D meshes. We will also explore lighting and 
shading. The goal of this part of the assignment is to familiarize yourself with transformations and 
hierarchical modeling in WebGL using a matrix stack. You will be modeling and animating a kinetic 
sculpture such as Alexander Calder's hanging mobiles. Example images and an example video are 
given below: 
 
 
Project 3 (Final Project, Part I) 
https://canvas.wpi.edu/courses/20567/assignments/136970[2020/6/23 2:38:33] 
First Steps: 
Your task is to model and animate a kinetic sculpture. In order to do so, you need to first construct a 
scene containing several objects, then you need to organize them hierarchically and simulate their 
motions according to the hierarchy you define. All models should be properly sized so that they do not 
look disproportionate or display awkwardly. All models should have approximately the same size. In the 
video, you should have noticed multiple axes of movement for each model, where the model may rotate 
about it's own axis while rotating around a larger arm off which it is hanging. Implement this effect!! To 
draw the arms connecting the meshes, you can just draw horizontal lines, and to connect the meshes to 
the ends of the arm, just draw vertical lines. Also, make sure you set up perspective projection 
Gouraud Lighting (smooth shading): Draw all your meshes in your hierarchy as solid meshes (not 
wireframes). Implement shaders for Gouraud lighting (as demonstrated in class) and flat shading. You 
will switch between shading types using keystrokes below. Apply some interesting colors and material 
properties to your 3D meshes. Don't forget to enable depth testing and hidden surface removal. 
Implement a spotlight: The spotlight is like a cone, and light only reaches objects inside the cone. 
Objects outside a certain angle--called the cutoff angle, phi--gets no light from the spotlight (although it 
may still receive ambient light from the environment). Make the cutoff angle a variable that can be 
controlled with a keystroke. Make sure the presence of the spotlight is obvious! 
Matrix stack: You will need to implement a matrix stack, including stack.push() and stack.pop() routines. 
You may use a simple linked list to store the stack or use a more sophisticated tree structure. 
Animation: Be mindful of performance issues while you implement this homework. As your scene size 
grows, avoid unnecessary re-initialization, file reopening, etc. that could slow down your program 
considerably. 
Other Requirements: Your sculpture must consist of at least 6 meshes with interesting colors, including 
at least three cubes and at least three spheres. Each mesh should have a different color. Your sculpture 
must contain at least 3 levels of hierarchy. (See the second image at the top of the page.) The animation 
should move all parts of the sculpture. It should be physically motivated and make sense; that is, there 
are no magical, free-flying shapes or disjointed movements. Objects should remain connected in 
whatever way you connected them as you animate them. 
All mesh models should rotate counter-clockwise about their own Y axis. The arms should rotate in the 
direction opposite of the level above it. For instance, if the arm of Level 1 of the hierarchy rotates 
clockwise, the arm of level 2 of the hierarchy should rotate counter-clockwise, the arm of level 3 should 
rotate clockwise, and so on. (You can have the level 1 arm rotate counter-clockwise and alternate from 
Project 3 (Final Project, Part I) 
https://canvas.wpi.edu/courses/20567/assignments/136970[2020/6/23 2:38:33] 
there, too.) Basically, the arms of consecutive levels of the hierarchy should alternate between rotating 
clockwise and counter-clockwise. 
Additional Keystrokes: 
Also implement the following additional keystrokes. 
(User hits 'p'): Increase spotlight cut off angle (increase cone angle) 
(User hits 'P'): Decrease spotlight cut off angle (decrease cone angle) 
(User hits 'm'): The scene is shaded using Gouraud lighting (smooth shading) 
(User hits 'M'): The scene is shaded using flat shading 
Note that these keys are case-sensitive. If you do not want to worry about case-sensitivity, you are also 
welcome to implement "i" instead of "P" for "decrease spotlight cut off angle" and "n" instead of "M" for 
"the scene is shaded using flat shading. 
Extra Credit: 
For this project, you are allowed to include additional features above and beyond the basic requirements. 
The instructor has sole discretion over the point value of each feature, and the student may earn up to 
10 points total. To earn any credit, you must list each feature in the comments at the top of your main *.js 
file. 
To be eligible for extra credit, the additional features must be graphical in nature. This means that you 
show thought behind how something is presented to the user on screen or how the graphics are being 
processed behind the scenes. In addition, the additional features may not be features you will implement 
as part of the base requirements for Part II of this project. 
Here are some example features to consider: 
Instead of basic geometric shapes, make some of the mobile models your .ply files from Project 2. 
Implement Phong instead of Gouraud shading. This means you will be implementing your shading on 
a per-pixel basis in the fragment shader. 
Implement a keystroke that draws a box around each mesh showing the extents of each mesh. 
Have the arms of the hierarchy follow a gentle sinusoid. i.e. in addition to going round clockwise or 
counterclockwise, the hierarchy arms (and objects) also go slightly up and down like on a merry go 
round. The sinusoidal movements of all levels of the hierarchy should have the same amplitude (i.e. 
move up and down gently by the same amount). 
You are not limited to these ideas. If there is something else you would like to do but are not sure if it 
would qualify for extra credit, please contact me. 
Submitting Your Work: 
Make sure to double-check that everything works before submitting. Put all of your files (JavaScript, 
HTML, etc.) into a folder and zip it. Please include your *.ply files for ease of grading. Upload it to 
Canvas. Do not email me your program or submit it via a third-party cloud storage account. 
Create documentation for your program and submit it along with the project inside the zip file. Your 
documentation can be either a pure ASCII text or a Microsoft Word file. The documentation does not 
Project 3 (Final Project, Part I) 
https://canvas.wpi.edu/courses/20567/assignments/136970[2020/6/23 2:38:33] 
Final Project, Part I Rubric (1) 
Criteria Ratings Pts 
have to be long. Briefly describe the structure of your program and what each file turned in contains. 
Also, please indicate whether your program uses .ply files, and please describe the rough location and 
direction of the spotlight in your scene. Name your zip file according to the 
convention LastnameFirstname_Final1.zip. 
Additional Notes: 
You are free to consult any resources you need to help you complete this assignment, including your 
classmates, the TA, the instructor, the class text, and any other books and websites. However, the 
code you turn in must be your own. Any evidence of plagiarism will result in an automatic 0 for 
this assignment. 
You are welcome to use any class coding examples (posted under "Modules") in your program. 
FAQ: 
Q. I'm trying to load the sphere.ply file, but the browser won't let me load the file unless a user 
selects it. What do I do? 
The sphere.ply file is optional. I encourage you to create spheres using subdivision surfaces as shown in 
one of the class examples. However, if you want to use the *.ply file, it's perfectly fine to keep the file 
upload box that you used in Project 2. Just be sure to indicate in your accompanying documentation that 
the user needs to upload the accompanying *.ply file to start the program. Also, please include the *.ply 
file. 
Q: The wrong faces on some of my meshes are being culled and/or my meshes are being lit 
incorrectly. 
It's possible that the face normals are being calculated incorrectly. If the shaders receive the vertex 
information in the wrong order, it's possible they may be calculating a face normal that's pointing in the 
wrong direction, making the culling or lighting routines think the polygon is back-facing instead of front- 
facing (and vice-versa for the back-facing polygons). 
Try reversing your vertex order for each polygon in your sphere, then see what happens. If that doesn't 
work, try changing the way you load the vertices and normals into the arrays from a,b,c to a,c,b. 
If it's a lighting issue, also make sure that the light position of your point light has a 1 in the fourth 
position (the w position). This makes it a point light. A light with w = 0 is an area light, which has different 
properties. Check out the section "Positioning Directional Lights" on this page for more details: 
https://tinyurl.com/yckyqmmg . 
 
https://canvas.wpi.edu/courses/20567/assignments/136970[2020/6/23 2:38:33] 
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