TEST 2 - CS458 Fall 2000

TEST 2 - CS458

Instructor Dr P Juell                         NAME_______________________ 
CLOSED BOOK                                             Nov 1, 2000
100 points

(15) You want a sphere with a dishlike bump into it. Briefly explain how you could get this using:
- constructive solid geometry (CSG)
- extrusion/deformation
- parametric creations of surface
(10) You you are working with a 3D image generation system such as VTK. Describe an experiment that would allow you to determine if the system uses a left hand coordinate system. (Just telling about the final test with your hand is not enough).
(5) Assume your GUI supplies a gravity field around points and lines, what might you expect to happen to the gravity field as the number of points and lines increase and get closer and closer in the image?
(10) There are various uses of pointing devices. List the types of uses of the devices in the following. First (a) the routine is selected from a menu, then (b) the person signs their name, finally (c) the user selects which line is the start of their last name.
```
(a)

(b)

(c)
```
(10) Draw four points, not colinear. Use these points for control points and approximate the Bezier curve.
(20) Circle the best answer for each:
True or False: the normal cone we use is also a ruled surface cone.
True or False: false coloring is a way to code a dimension of data into graduations of colors.
True or False: There is no way to display more than 3 dimensions of data on a flat monitor screen.
True or False: Fractals are a convenient way to build realistic looking items such clouds and mountain.
(10) If you build an object from a collection of flat surfaces (specified by polygons) which face of each surface is the outside face? You can assume the objects are convex (that is with no concave parts or no infolding. If you need to, you also know which face of one surface is outside (or inside).
(10) What does the following station reporting symbol mean? It is on a weather map and sitting at the location of Fargo.
```
  65 / .\
     ( ..)-----------
  40 \../       |   |
                    |
```
(10) Give an example where flow lines (or particle paths or streamers) would be effective.
Give an example where they would not be effective.