Computer Science 102
                               Quiz K      Name ______________________

Consider the conical spotlight in which the emitted light is constrained
by a conical shade.

1.  Suppose the spotlight is illuminating a plane.  The area illuminated will
    be circle if

    a. the dot product of the centerline  b. the dot product of the centerline
       direction and the plane normal is     direction and the plane normal is
       0                                     -1

    c. never                              d. always

2. Suppose costheta holds the cosine of the angle of the halfwidth of the cone.
   A point on the plane is illuminated if and only if the dot product of a unit
   vector from the light to the hitpoint is

   a. positive                            b. negative

   c. > costheta                          d. < costheta

3. Two new methods required by the projector type light included

   a. getemiss and getdiff                b. vischeck and illuminate

   c. vischeck and getdiff                d. getemiss and vischeck

4. When a new projector_t is created, instances of which classes will
   be created.

   a. projector_t only                    b. projector_t and light_t

   c. projector_t, light_t and            d. projector_t, light_t,
      texplane_t                             texplane_t, fplane_t, plane_t
                                             and object_t

5. Creating the new projector_t class required some retrofitting to address
   parsing problems that occured in:

   a. projector_t                         b. light_t

   c. texplane_t                          d. object_t