Angel: Interactive Computer Graphics, Seventh Edition
Chapter 3 Solutions
3.7 There are a couple of potential problems. One is that the application
program can map different points in object coordinates to the same point
3.8 In picking we have the additional problem that the point in screen
coordinates may not correspond to a point on any object or may transform
3.11 Consider a three position switch. The three positions can correspond
to velocities of 0, +1 and -1. We can integrate to get positions from these
velocities. Thus, we have no change (0), a constantly increasing position
3.14 Each scan is allocated 1/60 second. For a given scan we have to take
10% of the time for the vertical retrace which means that we start to draw
3.20 When the display is changing, primitives that move or are removed
from the display will leave a trace or motion blur on the display as the
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