Computer Science 215
                               Quiz 9      Name ______________________

1. The type of lighting to be supported in version 1 on the raytracer is:

   a. ambient                             b. diffuse

   c. specular                            d. emissive

2. Suppose V is the view point and W is the world coordinates of the point
   on the screen through which the ray passes.  A unit vector in the direction
   of the ray is given by:

   a. V / || V ||                         b. W / || W ||

   c. (V - W) / || (V - W)||              d. (W - V) / || (V - W) ||

3. If the coordinates of the point at which the ray hits the object is H
   the distance from the viewpoint to the hitpoint is given by:

   a. H                                   b. (H - V)

   c. || (H - V) ||                       d. (W - V)


4. The mission of the raytrace function is to determine:

   a. the color of the first object       b. the color of the closest object
      hit by the ray                         hit by the ray

   c. the color of the last object        d. the average color of all objects
      hit by the ray                         hit by the ray.

5. Colors are represented within the raytrace function itself as:

   a. unsigned chars in the range         b. unsigned chars in the range [0, 1]
      [0, 255]


   c. floating point values in the
      range [0, 1].