We have created a Wiki that will be the primary source of information about this assignment. On that page you will find all the details about what you need to implement, etc. This document only contains administrative details about building the starter code, grading, and submission.

The assignment is due Feb. 4 at 11:59:59 PM.

Please zip the following files and upload your zipped file to Gradescope.

• Cardinal3D/src folder
• model.dae
• writeup (.txt, .doc, .pdf)

One team only needs one submission, please tag your teammates in your submission.

This codebase should compile on Linux, Mac OS X, and Windows on a typical environment. Check out the building Guide to install dependencies and building the code.

When you have successfully built your code, you should get an executable named Cardinal3D. Upon starting the program, it should be in model mode. The User Guide details how to use the interface.

For this assignment, you will implement methods in meshEdit.cpp.

The User Guide on the wiki describes a large number of features that are in principle available in MeshEdit mode. You have to successfully implement a subset of the features as basic tasks, implementing additional features beyond the basic tasks will earn you extra credit points.

The basic tasks, and the percentage of the grade (92 pts total) they correspond to, are:

• Four local operations: EdgeCollapse, EdgeFlip, EdgeSplit and FaceBevel (8 pts each)
• Four global operations: Triangulation, LinearSubdivision and CatmullClarkSubdivision (10 pts each) and Simplification (20 pts)
• Create one beautiful 3D model using Cardinal3D (10 pts)

In other words, everyone has to implement EdgeCollapse, EdgeFlip, EdgeSplit, FaceBevel, Triangulation, LinearSubdivision, Catmull-Clark and Simplification. These features are the bare minimum needed to model interesting subdivision surfaces; Triangulation is necessary in order to do the global remeshing task(s). Note that some of the global tasks require that you implement specific local operations! For instance, the implementation of Simplification depends on EdgeCollapse. In summary, we list all the local operations as follows (these operations are described in the User Guide):

• VertexBevel
• EdgeBevel
• FaceBevel - basic task
• EraseVertex
• EraseEdge
• EdgeCollapse - basic task
• FaceCollapse
• EdgeFlip - basic task
• EdgeSplit - basic task

The global operations, and their dependency on local operations, are as follows:

• Triangulation - basic task
• LinearSubdivision - basic task
• CatmullClarkSubdivision - basic task
• Simplification - basic task
• LoopSubdivision - depends on EdgeSplit and EdgeFlip
• IsotropicRemeshing - depends on EdgeSplit, EdgeFlip, and EdgeCollapse

Each additional local operation beyond the basic tasks will be worth 1 pts; each additional global operation will be worth 2 pts. The maximum possible grade on the assignment is 100 pts.

Every student is required to submit a 3D model created from cube.dae (or other primitives) using their implementation of Cardinal3D, which will be automatically entered into a class-wide 3D modeling competition. Models will be critiqued and evaluated based on both technical sophistication and aesthetic beauty. Note: Use of any other 3D package (e.g., free or commercial 3D modelers like Maya or Blender) is strictly prohibited! This model must be created by opening cube.dae, applying the operations implemented as part of the assignment, and saving the result.

NOTE: We are expecting some high-quality output here---or at least some creativity! Don't just brush this one off. :-)

Include this model in the root directory of your submission as model.dae.

Additionally, you will submit a short document explaining what you have implemented, and any particular details of your submission. If your submission includes any implementations which are not entirely functional, please detail what works and what doesn't, along with where you got stuck. This document does not need to be long; correctly implemented features may simply be listed, and incomplete features should be described in a few sentences at most.

The writeup can be a pdf, markdown, or plaintext file. Include it in the root directory of your submission as writeup.pdf, writeup.md, or writeup.txt.

If we cannot find this writeup in your submission, no addtional implemented operations will be graded.

CS248 course staff would like to thank Professor Keenan Crane and his course assistants for the initial development of assignment materials.