Problem Set 2
CMSC 427
Distributed Thursday, February 20, 2005
Due: Tuesday, March 6, 2005
Collisions, Intersections, Perspective and More Transformations
Programming
An executable for the finished version of this problem set is available on the class web
page. You can obtain code that satisfies the conditions of problem set 1 by sending email
to [email protected] (I’d prefer not to post it on the web). You can use this as a
starting point, or you can use your own implementation of PS 1 to start. This code, and
perhaps yours, handles the somersault. However, in this problem set, you don’t need to
worry about getting everything to interact properly with the somersault, in fact, feel free
to delete the somersault.
I have added a few features in the executable that you are not required to implement.
These include some print statements to indicate speed and intersections, and keyboard
functions for ‘d’, ‘e’, ‘r’, and ‘t’. I found these helpful for debugging purposes and you
might find similar functions useful.
Note that throughout the problem set you can assume that the rectanguloids in the scene
are axial aligned, and do not intersect each other. The car will not usually be axial
aligned, however. You can receive extra credit for handling more general rectanguloids
in the scene.
By the way, it is certainly possible that my code has bugs. If it does, this does not excuse
you if you have the same bugs. If you have any doubts about the program’s desired
performance, please ask.
1. 5 points. Fix up the scene so that it looks nice, with a few rectanguloids scattered
here and there. Make at least one rectanguloid tall, so that you can tip it over (see
part 5). Make the rectanguloids displayed with solid sides, instead of wire frames
(look at the command glPolygonMode).
2. 15 points. Add to the code so that the viewing position cannot go inside any of
the rectanguloids. If the viewing position attempts to go inside a rectanguloid, it
will remain outside, unmoving instead. When the viewer tries to enter the
rectanguloid, the rectanguloid will slowly turn yellow. Note that if you do part 4,
this part need not be present in your final code. However, doing this problem is a
good warm up for part 4, and you can get credit for this part even if you are
unable to get 4 working.
3. 15 points. Now, instead of considering the viewer as occupying a single point at
the viewing position, imagine that you are driving a rectanguloid car. This
rectanguloid is aligned with the viewing direction. So when you turn, the car
turns. The car is always pointing in the same direction in which you are viewing,
