CS 285: SOLID MODELING
Lecture #7 -- We, Feb. 13, 2002.
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Preparation
- Look at some of the frieze references and pictures in Lecture #5.
- Determine the symmetries of the objects you encounter in your daily life.
- Think about: -- Why does an ordinary wall mirror reverse left and right, but not up and down ??
Why are we discussing symmetry in this course ?
Symmetries of 3D Objects (cont.)
Comments on Assignment #4: Designing a Bell
Distinguish:
- High-level shape parameters: Ellipticity, aspect ratio, curvature of flange ...
These are the real "design-parameters."
- Implementation/refinement parameters: L-slices, W-slices, grid-widths, ...
- Debugging parameters: DrawSweep, DrawPath, arc-of-sweep, ...
Parallel shells are not enough -- need to close off the rims!
May want to use offset surface that will do this for you automatically.
Don't use the more cumbersome "swepmorph" when not needed.
If you always have the same type of cross section (e.g., a circle),
just scaled, elongated, and possibly rotated, then just use ordinary sweep
with control points that carry the necessary transformation instructions.
RE: Fair N-sided Die:
-- Is there a homogeneous, convex, polyhedral object with exactly
one stable face ?
Layered Manufacturing
The principle.
Our FDM Machine.
New Homework Assignment:
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