CS 381 > Assignment 6

CS 381, Fall 2003
Assignment 6

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 "GA6". (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: Tuesday, October 28 (any time).
Worth: 30 points.

Homework Policies

See the Homework Policies handout.

Questions (5 pts)

Let v = (1, 2, 0), and let w = (0, 2, 2). Find the angle between v and w, in degrees, to two decimal places.
Suppose you do
```
glVertex3d(2., 4., 5.);
```
What does OpenGL actually send through the pipeline? Hint: The answer is not (2, 4, 5).
Suppose you do
```
glLoadIdentity();
glTranslated(2., 4., 5.);
```
What matrix is generated by OpenGL?
Suppose you do
```
glLoadIdentity();
glScaled(2., 4., 5.);
```
What matrix is generated by OpenGL?
Briefly explain the difference between the roles of the projection transformation and the model/view transformation in the OpenGL geometry rendering pipeline.

Program (25 pts)

Write a C++ program using OpenGL/GLUT that meets the following requirements.

Your program must draw at least one 3-D object, with proper hidden-surface removal.
The user must be able to move at least one object and/or change the viewpoint interactively.
- The movement or viewpoint change must be accomplished using the OpenGL model/view transformation.
- The transformations must allow the user to see all sides of at least one 3-D object.
- Your program must use all three of the primary transformation commands (glTranslate*, glRotate*, glScale*).
Your program must provide documentation in either a graphics window or a pop-up menu, as in Assignment 4.

Suggestions for Full Credit

You get the idea by now, right? The same sorts of things that got you full credit before will still get you full credit (but remember that you only get credit for using advanced OpenGL features if we have not covered them, and you have not gotten credit for them in an earlier assignment). In any case, here are some new ideas.

Design and implement an intuitive mouse-based method for rotating & viewing 3-D objects.
Write a program that allows the user to “fly” through a 3-D world.
Make a moving object that has moving parts (the parts must move with the larger object when it moves, and must also be capable of independent movement).
Try:
- Using fog.
- Texturing a 3-D object.

Note

Particularly well-done programs may be demonstrated in class.

CS 381, Fall 2003: Assignment 6 / Last update: 20 Oct 2003 / Glenn G. Chappell / ffggc@uaf.edu