TEST 3 CS458

Instructor Dr P Juell    NAID______________________ NAME__________________________

100 points, closed book                                  Dec. 7, 2004
  1. (10) Some color printers have 4 color inks (3 plus black) and some have 6 (5 plus black). Ignore the black, draw what these two versions mean on a CIE model. You do not have to be accurate, just give the flavor. Explain what on the diagram would want you to chose the printer with more colors.
  2. (10) How is it possible that a black and white dot matrix printer can produce images that look like they have continuous gray scale? Be sure to give the name of the technique and a little why it works.
  3. (10) Consider flat shading (FS) and ray tracing (RT). Assume both are done with infinitesimal (as small as needed) patches and are using the same lighting formula. Would there be obvious differences in an image done with the two techniques?
    Explain.
  4. (10) Between Gouraud and Phong which is SLOWER and what extra calculation is done?
  5. (10) Assume you created a movie of the images created in the progressive refinement of radiosity. That is an image at the start of each step. What effect would you see?
  6. (10) The first person shooter (FPS) games require very fast high quality images. The preference is give to speed but they do want realistic images. Give two techniques you might choose in building a FPS system to address their goals and why. (Sometimes the choices are about the objects or the world).
  7. (10) What do you get if you use Phong shading with a cube?
  8. (10) In HSV (0,1,1) is Red. Specify HSV and RGB values for the following colors:
    color ( H, S, V) ( R, G, B)
    pink
    _
    white
    _
    black
    _
    gray
    _
    dark red
    _

  9. (10) In the painter's algorithm, operations such as sorting and clipping are slow. Why then is the algorithm used?
  10. (10) In a virtual reality system you may have multiple people looking at the same scene at the same time, but from different view points. List two techniques (out of any listed in the class) that could share results between the view points (without changing the routines).
    List two techniques that could not share results.