FINAL - CS458
     Instructor Dr P Juell                   NAME_______________________
     CLOSED BOOK                                        Dec 18, 1996
     200 points

     1. (40) Match the following  words  or  phrases.   There  may  be
     multiple items related with each item.  You are to take the best.

     ____ rubber-band methods

     ____ view point

     ____ Bresenham

     ____ retrace and blanking

     ____ odd even rule

     ____ pallet table size

     ____ 4 by 4 matrix

     ____ Z-buffer


     ----------------------

     a) fast line drawing routine

     b) time when raster type displays do not display pixels

     c) slow but simple way to find visible points

     d) number of district colors that can simmultainoulsly be displayed

     e) determines which are back faces

     f) used in scan line filling to determine if inside

     g) used with interactive pointing device

     h) used to transform 3 D points



     2. (10) Those trying to produce realistic images (RI)  and  those
     trying  to  visualize data (VD) have rather different concerns in
     creating an image.  Why would the VD group use  pseudo-color  and
     why would RI group normally not use pseudo-color?

















     3. (10) Pallet (tables) are used  on  monitors  to  reduce  cost.
     What is being saved (reduced in cost) by use a pallet rather than
     displaying full color for every pixel?











     4. (10) Give a technique to  allow  displaying  more  then  three
     dimensions of data in a visualization image.







     5. (10) What are the reasons why a line in a model may have  only
     part of the line displayed in a window?







     6. (20) Specify two pointer devices.  Specify for each  device  a
     problem  or  operation  where  you would prefer it over the other
     pointer device.

     device 1:

     device 2:

     problem for 1 over 2:


     problem for 2 over 1:






















     7. (20) A cube has its center at (5,7,8).  Write the sequence  of
     transformations  to  turn  another  face  up.   (Use the T(x,y,z)
     S(sx,sy,sz) Rx(A), Ry(A), Rz(A) type notation). (Use  the  book's
     order of operations)





     Then rewrite these as matrices.











     8. (10) Can you get specular highlights with only ambient light?

     ONLY YES OR NO


     9. (10) Each of the following shapes are encoded using a quadtree
     notation.  The encoded images have the same image quality.  Which
     item would you expect would take less space?

     PICK ONE: a circle - a square - a Koch snowflake


     10. (10) A cube is displayed on a monitor.  How can you  tell  if
     it  is  displayed  with an orthographic projection or prospective
     projection?






























     11. (15) Number of the following in order from first to  be  done
     (1) to last (5).

     ____ back face removal

     ____ display

     ____ Z-buffer

     ____ clip to viewing volume

     ____ transform to viewing coordinates

     12. (10) What is a major benefit in  having  each  agent,   of  a
     world  model, having its own separate transformation matrix?  (Be
     sure to include a clear example).











     13. (15) In RGB noation, what colors  are  the  following?   (Min
     value is zero, max is 1).

     (0,0,0) ______________

     (1,1,1) _______________

     (1,0,0) _______________

     (1,0,1) _______________

     (0,0,.5) ______________

     14. (10) Were would you find the following symbol?
     What is it indicating?
     (Hint, this is NOT a key).

        ...
       .   .
       .   .------------------
       .   .           !  !  !
        ...               !  !