CS 381, Fall 2003
Assignment 2

General Information

• E-mail answers to the questions and C++ source for the program described below to me at ffggc@uaf.edu, using the subject "GA2". (If you wish to discuss the assignment with me via e-mail, use a different subject.)
  • If possible, please send your source as an attachment to your e-mail, rather than as part of the body text.
  • Send source only! No executables, project/workspace files, etc.
• Be sure to include your name in your e-mail.
• Due: Thursday, September 18 (any time).
• Worth: 25 points.

Homework Policies

Questions (5 pts)

1. The glBegin-style primitives all draw points, lines, or polygons. But OpenGL has other primitives. What sorts of things do they draw?
2. Why is it generally a good idea to post a redisplay event (in GLUT, by calling glutPostRedisplay) when the window contents need updating, rather than calling the display function directly?
3. List two issues that come up in 3-D CG that do not come up (or are much simpler to deal with) in 2-D CG.

Program (20 pts)

• Your program must use all ten of the glBegin-style OpenGL primitives.
• Your program must respond in some meaningful way to the keyboard.
• Do not make me work hard to figure out how your program is used; put some simple documentation on the screen (in the text window, for example).

Suggestions for Full Credit

• Add a more advanced OpenGL feature to your program. For example, try learning about and implementing one of the following.
  • line stipples
  • polygon stipples
  • polygon mode
  • display lists (“call lists”)
• Have your program’s display change automatically, without requiring user input.
• Draw text in your program’s (graphics) window.
• Have your program respond to the mouse in some interesting way.

Note