Past Midterm and Exam Questions (PDF) - Student.cs.uwaterloo.ca ...

CS488/688 Introduction to Computer Graphics 41
(iv) A patterned tile floor.
(v) The ripples created by dropping a stone in a pool of water.
(vi) A wooden table top.
15.7 Texture Mapping vs Solid Textures [Last Used: Winter 2013 Final]
Marble is rendered in the two images below. Below each image, note which computer graphics
technique was used to generate the marble.
15.8 Phong vs. Gouraud Shading [Last Used: Fall 2004 Midterm]
A new machine arrives in the graphics lab. You know that it renders shaded polygons, but the
manuals don’t specify whether they are flat shaded, Gouraud shaded, or Phong shaded. Give a
test (or series of tests) to determine which shading method is used. You may specify the vertex
positions and normals of polygons, the surface property of each polygon, the location of the light
source(s), and the viewing position and direction.
Be specific about the scene itself, and what you would look for in the resulting image to determine
which shading method is used.
15.9 Lighting Model [Last Used: Winter 1996 Final]
In our illumination model, there were three terms: an ambient term, a diffuse term, and a specular
term.
• What effect does the ambient term model?
• What assumption(s) do we make for the diffuse term?
• In the specular term, there is a factor of (⃗r · ⃗v) p . What effect does varying the p power have?