CS 284: CAGD
Lecture #17 -- Thu 10/18, 2012.

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Preparation: Read: Surface Simplification Using QEM and Progressive Meshes

"Inverse Quiz":

Assume you are in the position of the professor teaching this class:

For both of today's papers define two quiz questions each.

Paper Presentations:

Soham and Brandon discussing: Surface Simplification Using QEM

1.) What are the main advantages of this simplification approach?
2.) When is aggregation a good idea? How is it kept under control?
3.) how is the location of a pair contraction determined. How worthwhile is this method?
4.) What is the geometrical meaning of the quadric error ellipsoids (in Fig 11, 18)?
5.) How is a sharp edge maintained through alarge number of simplification steps?

Michael and Eric discussing: Progressive Meshes

1.) What are the benefits of the Progressive Mesh representation?
2.) How is such a representation constructed?
3.) What are the key geometric operations at the mesh level?
4.) What is geomorphing and how does it work?
5.) How is selective refinement implemented?

Extrapolation...

Inspired by Progressive Meshes,
we would like to create a refinement scheme for Loop subdivision surfaces,
so that we could add some details (e.g. an embossed figure) on one side of a the spheroid
resulting from subdividing an initial control mesh in the shape of an octahedron.
How could this be accomplished ?
DISCUSSION ...

Your Project:

Next Thursday: "Venture Capitalist Rally" or "NSF Proposal Review"

6-minute formal Project Proposal Presentations: -- How to get the "gold".

Format:

Should last 5-6 minutes (hard 6 minute cutoff).
Start with an attention-grabber.
Be enthusiastic, make an impact.
Your peers will rank-order your performance.

Content:

The goal of the project
The approach you will take
The deliverables and demos resulting
Why this is a "good" project ( = somewhat of a "selling" job):

how useful it might be, or
just how "cool" it is going to be, or
what you hope to learn with this project ...

Presentation order, time table, and score sheet
(will be updated when I have all your final proposals)

Assignments for Tue. Oct. 23, 2012:

Study (well enough for a quiz): IS'02: Modelling with Implicit Surfaces that Interpolate

Programming: Continue implementing your dyadic triangle subdivision:
1.) Add some rounding/smoothing scheme and demonstrate it on your mug. Send me pictures by Tuesday, October 16.
2.) Add some "interesting" texture, i.e., the tiles should have some "directionality" and should not fit together with arbitrary rotations or with every possible pairing of sides. For instance, try to use the square "fish" tile or the triangular "lizard tile" shown above.
Get this to work by Tuesday, October 23.

COURSE PROJECTS:
By Thuesday, Oct. 23, e-mail the latest, fine-tuned version of your proposal.

Thursday Oct. 25: "Venture Capitalist Rally" or "NSF Proposal Review"