惨了，黑老师出了张全英文图形学试卷！悬赏高手帮忙解决下，先谢

Final review

1, Explain what the following code does and describe the output.

#include

void mydisplay(){

    glClear(GL_COLOR_BUFFER_BIT);

       glBegin(GL_POLYGON);       

              glVertex2f(-0.5, -0.5);       

              glVertex2f(-0.5, 0.5);       

              glVertex2f(0.5, 0.5);       

       glEnd();

       glFlush();

}

int main(int argc, char** argv){

       glutCreateWindow("simple");    

       glutDisplayFunc(mydisplay);   

       glutMainLoop();

}

 

2, OpenGL can be viewed as a state machine, a black box that contains a finite state machine. Explain what is a state machine.

 

3, To deal with multiple functions for a similar purpose, C++ and OpenGL take different approaches: C++ use overloading while OpenGL defined a number of functions which differ from each other in the last letter, for example, glVertex3f, glVertex2i, glVertex3dv all create vertex but the first take different data types as input. What is the advantage of each approach?

 

4,Assuming that a certain full-color (24 bit per pixel) RGB raster system has a 1024 by 1024 frame buffer, how many distinct color choices would we have available? How many different colors could we display at any one time? If 20 megabytes/second can be transferred, how much time (in seconds) will it take to load the frame buffer?

 

5, What is homogeneous coordinates? What is the advantage of them?

 

6, What is SIGGRAPH?

 

7. Describe the Bresenham aLGorithm for drawing lines. Explain the difference between the Bresenham algorithm and DDA.

 

8. Explain the algorithm for scan-converting convex polygons. It is not necessary to write the code, a precise narrative descripqion is sufficient.

 

9. What is the homogeneous form of a 2D point?

 

10. What is the homogeneous form of a 3D point?

 

11. Describe examples of aliasing.

 

12. Gamma describes what property of a CRT?

 

13. Consider this sequence of calls:

glColor3f(1.0, 1.0, 1.0);

glVertex3f(1.0, 1.0, 1.0);

glVertex3f(2.0, 2.0, 3.0);

glColor3f(0.0, 1.0, 1.0);

What color is the vertex (1.0, 1.0, 1.0)?

What color is the vertex (2.0, 2.0, 3.0)?

 

14. Convert these homogeneous points to Cartesian: (0,1,3,2), (2,1,3,4), (2,4,3,5).

 

15,. Give the 4x4 homogeneous matrix for a translation by (2,1,3).

 

16. How do you do a rotation about a point that does not go thru the origin?

 

18. What are the 3 primary suBTractive colors?

20. What is the difference between additive and subtractive output devices?

 

21. Describe 3 aliasing artifacts present in Computer Graphics.

 

22. Describe one method of anti-aliasing.

 

Definitions

Briefly define the following terms as they apply to computer graphics.

 

1. affine transformation

2. aliasing

3. anti-aliasing

4. GUI

5. callback

6. cathode

7. concave

8. convex

9. DDA

10. frame

11. frame buffer

12. gamma correction

13. homogeneous coordinates

14. ink jet

15. interlace

16. jaggies

17. LCD

18. keyframe animiation

19. left-handed coordinate system

20. lightpen

21. linear space

22. look-up table (LUT)

23. CAD

24. persistence of phosphor

25. pixel

26. raster display

27. RGB

28. world coordinates

29. Resolution,

30. Pixel

31. Color buffer

32. Depth, bit planes, 

33. Bitmap