Computer Science 215
                               Quiz N      Name ______________________

1. To create a generic tiled plane that could be used as a back or
   side wall with the tile pattern in an arbitrary direction it
   was necessary to specify an additional vector.  This vector

   a. lies in the plane itself    b. is orthogonal to the
                                     planes normal

   c. specifies the direction     d. all of the above
      of the tiling pattern

2. To determine if a hitloc lies in a spotlight's cone, take
   the dot product of the spotlights centerline with:

   a. a vector in the direction   b. a vector pointing from
      of the ray being traced        the hitloc to the spotlight
                                     center

   c. a vector from the spotlight d. a vector from the spotlight
      center to the hitloc           center to the viewpoint.

3. The class view_t definition starts as follows:

   class view_t
   {
      friend class pixel_t;

   the "friend" declaration gives:

   a. view_t methods access to    b. pixel_t methods access to the
      the private data of a          private data of a view_t instance
      pixel_t instance


   c. both of the above           d. neither of the above because
                                     "friend" only provides access
                                     to public data.

4. The obj_t class definition contains a virtual function
    virtual void    getamb(double *){};

   the sphere_t class which is derived from obj_t contains:

     virtual void    getamb(double *w) {matamb(w);};

   When obj->getamb(w); is invoked and the obj is actually
   a sphere_t the actual function that gets called is:

   a. always the one in obj_t       b. always the one in sphere_t

   c. depends upon whether obj
      is declared obj_t *obj or
      sphere_t *obj;

5. If the declaration:    virtual void    getamb(double *){};
   is changed to:         virtual void    getamb(double *);

   a. It will create a syntax      b. it will correct a syntax
      error at compile time.          error

   c. it will create a link time
      error unless an implementation
      of getamb() is added to objt.cpp