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TEST 3 - CS458
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Instructor Dr P Juell                   NAME_______________________
CLOSED BOOK                                        Dec 4, 1996
100 points
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1. (20)
You have a set of objects with faces modeled in a computer.
These are converted into an image on a window of a computer display.
What determines if a particular face is displayed in that window?
(Note this covers a significant number steps and algorithms.  You do
not need to explain the details of how the algorithms work, but you do
need to identify the algorithm or type of test needed).
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2. (20)
A group is trying to do visualization of Wall Street stocks.  They produce
an image with a number of animals in it.  Each animal has the identifier
for a stock on it, e.g. IBM, Intel, Apple.
There are three different animals: bulls, bears and sheep.
Individual animals are colored from red to blue.
The animals are each in one of three positions: sitting, standing, jumping.

What are these properties (animal type, color etc.) being used for?
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Would you normally expect a consistent relationship between any two of these
properties?
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Why or why not?
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What would you hope to be able to get out of this type of visualization?
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3. (20)
Constructive Solid-Geometry (CSG),
Blobby Objects,
Spline Representations and
Sweep Representations
are four ways to define solid objects.
Give an example where you would chose each one over the other three.
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4. (20)
Suggest how to use a collection of techniques to build a representation
of the image shown.
You should use three of the techniques presented in class to build
models of solid objects.
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5. (10)
How is vector information marked on a surface weather map?
You may need both a drawing and a short explanation.
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6. (10)
What are iso-lines (contour) used for?
(Not just, what are they).