Page 1Midterm F 2010 Solution (Computer Graphics Fall 2010)
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ECSE-4750 COMPUTER GRAPHICS, RENSSELAER POLYTECHNIC
INSTITUTE, FALL 2010
MIDTERM F2010 SOLUTION
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ANSWERS
ECSE-4750 Computer Graphics, Rensselaer Polytechnic Institute, Midterm Exam, Fall 2010
NAME: _______________________________ _____
EMAIL:___________________________ RIN:______________
14 Oct 2010 4-5:30
Answer every question .There are 5 pages with 22 questions, total 44 points.
For 2 questions, you may write free for your answer (and get 2 points each).
This exam is open book : you may use calculators and any paper books and notes that you brought with you. You may not use computers
or communication devices, or share material with other students .
1. _____/2 Why do we want to make projection into a matrix multiplication?
So we can combine it with all the other matrix operations (translation, rotation, scaling).
2. _____/2 Why does OpenGL contain primitives, like triangle strips, that are not necessary (since you could draw the triangles
separately)?
It's more efficient since fewer vertices are needed than if you drew each triangle separately.
3. _____/2 What is the event loop?
It's what your OpenGL program transfers to as its last action . The loop then waits for inputs , such as mouse clicks. For each input, it
calls the appropriate callback routine, if you've registered one. On its return, the loop waits for the next input, and repeats.
4. _____/2 What does this do :
glutDisplayFunc(display)
It registers the user routine display as the display callback.
