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TEST 2 - CS458 
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Instructor Dr P Juell                   NAME_______________________ 
OPEN BOOK                                        Oct 27, 1998
100 points         
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1. (15)
You are using Hermite splines and you have the actual slope of the desired
curve at each control point.
What, if anything, does this tell you about type 0, type 1 and 
type 2 continuity at these points?

type 0


type 1


type 2


2. (10)
What is the normal assumption about spatial relationships that
makes contour lines meaningful?
(In other terms, when might you use contour lines?)
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3. (16)
In creating a curved line you might hand draw and sample the input stream.
Even though you are sampling the input
you may want to use a curve function (such as Bezier).
Why?
.sp 10

How do you get straight lines from sampled input?
(remember, the hand may shake, and the mouse/pointer may not 
track exactly correct.)
.sp 10

4. (10)
What would you expect would happen to the generated curve
if the list of blending functions were used in the other order?
That is the blending function for the closest point was used on
the most distance point etc.
This would cause the most distance point used in the blending would have
the most effect and the closest the lest.
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5. (10)
Show the points to produce a reasonable "B" using
a Bezier curve.
If you need multiple points at a location please indicate by
a number, the number of points at that location.
Remember, use enough points, not too many points.
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6. (14)
Give a example where you prefer to build an object using
"blobby object" techniques over CSG.
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CSG over blobby.
.sp 3

7. (15)
In three space the picture element is voxel rather than a the 2D image pixel.
Assume you want to store a 3D black and white image.  Three methods to store
it are (1) to assign a bit per voxel,
(2) save the x,y,z address for each voxel that is on, 
or (3) use octree encoding.
Specify an image type or example for each of the three 
storage techniques where that technique would be better
than the other two techniques.

(1) bit per voxel


(2) x,y,z address


(3) octree



8. (10)
What is a good reason for using a fractal?
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Why might you NOT want to use a fractal?
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