Angel: Interactive Computer Graphics, Seventh Edition
Chapter 3 Odd 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
3.11 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
3.13 Let (x1, y1) be the end of the arm of length l1. Assuming that the
lower-left corner is the origin
x1=l1cos θ
y1=l−1 sin θ
1