Computer Science 102
                               Quiz 6      Name ______________________

1. Suppose a ray is fired from the viewpoint V in direction D
   hits the plane at a distance t from V. The coordinates of the
   hitpoint are:

   a. P + tN                       b. V + tP

   c. D + tV                       d. V + tD

2. The use of a function pointer hits in the object structure
       double  (*hits)(vec_t *base, vec_t *dir, struct object_type *);
   allows us to mimic what facility of a true O-O language in C.

   a. polymorphism                 d. inheritance

   c. unitarianism                 d. nihilism

3. Suppose a ray is fired from coordinate (4, 3, 6) in direction
   (0.707, 0, -0.707).  Assuming it hits an object at a distance
   10 units from the source (4, 3, 6) what are the coordinates of
   the hit point.






4. We will employ a distributed parsing strategy in which each
   specialization within the inheritance heirarchy is responsible
   for reading its own attributes.   (e.g. object_init reads material
   but plane_init reads point and normal).  Our system is designed
   to be compatible with C++.  This will force us to specify
   the color of an object (e.g. material green)

   a. first                          b. last

   c. anywhere