CS 285: SOLID MODELING

Lecture #16 -- We, Mar. 20, 2002.

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Preparation

READ: Paper Scheduled for Discussion: SD01 -- HANDOUT !

Paper Presentation and Discussion

Main Points -- SELFTEST:

What is the targeted user for this system ?
What is the underlying object representation ?
What kind of objects can be created ?
Are the objects ready to be made with SFF (e.g., FDM) ?
Can you turn a sphere into a donut ?
Which points are affected in a move ?
How much is each of them moved ?
How are wrinkles avoided ?
What is the meaning of quadratic precision ?
What do you think of the demonstrated results ?

Comparison with other papers we read so far:

How does this relate/compare/contrast with the "Virtual Clay" approach ?
How does this relate/compare/contrast with "Procedural Modeling of Cities" ?
How does this relate/compare/contrast with the "Escher Sphere Construction Kit" ?

Some Discussion of Possible Projects

Most of you wanted a "structured" project and some guidance in defining it;
thus it is good to build on something that you have already seen in this course:

The "chef" recommends:

BELLS: Make tetra hedralized model of a bell,
then work with Chen Shen on sound simulation.
TILES: Make final FDM prototype of rhomic tile for triacontahedron (6D hypercube),
then make injection mold for this tile.
ESCHER TILES: With a downloadable 2D planar Escher tiling program make a nice pattern,
then map this pattern onto a torus and make the whole thing on the Zcorp color printer.
BOOLEANS: Design a 4-8 piece puzzle that composes a sphere or a Platonic solid,
then make the individual tiles on the FDM machine.
GEARS (next assignment): Modify the existing gearwheel program to make a planar 2.5D gear
that is based on two "complementary" bulgy shapes rather than on touching circles.
GEARS (next assignment): Modify the existing gearwheel program to make a planar 2.5D gear
that demonstrates the movement of the triangular core of the Wankel engine in its housing.
GEARS (next assignment): Extrude and twist the existing gearwheel generator into 3D
to make two interlocking hyperbolic gears (in shape of a cooling tower) and their axis support.

In the next 24 hours, please let me know your top three choices for a possible project,
which may be taken from the above numbered list,
from the project list,
or may be a brief description of an idea of your own.

Current Homework Assignments:

A#8: Monogram Blocks
Phase 1: CAD Design in SLIDE (send me slf file); DUE: Friday, 3/15, 6pm.
Phase 2: SML Files ready for fab (run the slicing and boolean scripts); DUE : Tuesday, 3/19, 6pm.
Phase 3: Actual fabrication of the two cubes; DUE : Monday, 4/1, 9:10am, in class.
Also complete your final prototype versions of your "polymorph" tiles: DUE : Monday, 4/1, 9:10am, in class.

Choose some tentative Projects Ideas (see above).
Selections made so far

New Homework Assignment (for after Spring Break):

Reading Assignment: HANDOUT "Gears"
Assignment #9: Modify an existing SLIDE gear demonstration program to make two interlocking operational CONIC gearwheels. DUE : Wednesday, 4/3, ready to demonstrate in class.