Homework 4: Cloth Sim
In this assignment, you will implement a real-time simulation of cloth using a mass and spring based system. You will build the data structures to discretely represent the cloth, define and apply physical constraints on them, and apply numerical integration to simulate the way cloth moves over time. Finally, you will implement collisions with other objects as well as self-collisions to prevent cloth clipping.
Logistics
Starter Code
Please accept the GitHub Classroom invitation to gain access to the starter code.
Deliverables
Your submission for this homework involves a checkpoint quiz, final code submission, and a final write-up. If you worked with a partner, remember to add your partner to all of your Gradescope submissions!
Deadlines
| Task | Due |
|---|---|
| Checkpoint Quiz | Friday, March 21, 2025 |
| Final Code Submission | Tuesday, April 8, 2025 |
| Final Write-Up | Tuesday, April 8, 2025 |
All assignments are due at 11:59 PM. You have a total of 8 late days to use on assignments throughout the entire semester, but you do not have late days for checkpoint quizzes. Assignments which are turned in after 11:59PM will use one of your late days – there are no late minutes or late hours. Both your code and write-up need to be turned in for our submission to be complete.
Partners
You can optionally work with a partner on this homework. If you work with a partner, both of you should join the same team on Github Classroom. You should also produce 1 write-up and 1 gradescope submission with your partner added to the team for both the code and the write-up submission. As a reminder, homeworks consists of many moving parts that work together so it’s important that you both work together on all parts.
Checkpoint Quiz
There is a Gradescope Checkpoint quiz for this homework, due Friday, March 21, 2025. This short quiz is intended to help you get started on Homework 4. The content necessary for answering all questions can be found on the Homework 4 spec or in lecture material. If you are working with a partner, both partners must submit the quiz!
The content necessary for answering all questions can be found on the homework spec or in lecture material. You will receive 5 “buffer points” for completing the quiz only if you answer at least 4 out of 7 questions correctly. These 5 buffer points will be added to your Homework 4 grade, capped at increasing your score to 100. For example, if you earned 96 points on the base homework and 2 points of extra credit, the 5 buffer points will bring your score up to 100, and the extra credit will bring your total score to 102.
You may change your answers after submitting, up until the deadline. No slip days may be used on checkpoint quizzes.
Homework Parties
We will have 5 homework parties:
| Date | Time | Location |
|---|---|---|
| Wed 4/2 | 5PM - 7PM | Soda 326 |
| Fri 4/4 | 10AM - 12PM | Soda 310 |
| Mon 4/7 | 11AM - 1PM | Cory 299 |
| Mon 4/7 | 5PM - 7PM | Soda 380 |
| Tue 4/8 | 5PM - 7PM | Soda 430 (Woz Lounge) |
See the course calendar for more information.
Academic Honesty
Please do not post code to a public GitHub repository, even after the class is finished, since these assignments will be reused both here and at other universities in the future.
The homeworks are to be completed individually, unless you are working with a partner. You are welcome to discuss the various parts of the assignments with your classmates, but you must implement the algorithms yourself. You are free to share all code with your partner.