CS 285: SOLID MODELING

Lecture #27-- Thu, Nov. 29, 2007.

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Warm-up Exercise on "3D Thinking"

Consider a cube suspended from one of its corners.
Slowly lower it towards a surface of water, and let it dip in more and more, until it is finally fully immersed.
Draw the various types of cross-sectional shapes that the water surface forms around the cube for various levels of immersion.
(-> solution)

What "mental scaffolding" did you use to assist you in this task ?

How can symmetry considerations be of any help ?

Would a 3D model help ?

Bisection of "striated cube" ...

Thinking in 3D is hard -- and error prone:

Cluster of 11 ten-segment ring tiles:

How many ring-tiles need to be split ?
Can the cluster assembly be completed ?

The shape of the three-segment ring-tile in the triamond lattice:

Sometimes making a 3D paper model is most effective !

Questions on how to turn your Prototype Parts into injection-moldable parts ?

The constraints associated with injection-moldable parts:

The geometry must be described by two halves that have no "overhangs,"
The volume of the whole part should be kept small,
Its connectivity should be such that the mold material can easily flow to all extremal locations.

Results of Feedback Questionnaires on the papers studied in this course

Organizing the formal "Project Presentation Talks"

Presentation Format:

Formal 15-20 minute review with few interruptions ( Think of a NSF or DARPA review panel! )
Presentation should be confident, polished, with nice visuals.
It should not just be an "advertisement/sales-talk", but describe some technical accomplishment.
Since your projects may only be half-way done at this point, also present a concrete task list of what you still plan to do.

We will follow these presentations with a 5-10 minutes of Q&A period, and an opportunity for feedback and suggestions.

Hands-on Project Demonstrations:

Dec. 19-20, or by special appointment.

Analogies from 2D to 3D (and to 4D ?)

Discussion of "Analogies from 2D to 3D"

How to come up with initial designs ?
How would you model most efficiently the objects discussed in this paper?
How would you parameterize these objects in SLIDE?

"Homage to Hilbert" by Nelson Max

HKN Course Survey

Last Homework Assignment: Make your design injection-moldable.

Phase 5 - due Saturday, Dec. 1, 2007: Produce .STL and .SML files.