Computer Graphics – BE (PU) Question Paper 2010 | Semester : Spring

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Computer GraphicsPokhara University | Old Question Paper
Bachelor of Engineering (BE)
Computer Graphics – Level: Bachelor
Year: 2010 | Semester : Spring

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Question Paper is Given Below:

Full Marks: 100 | Pass Marks: 45 | Time: 3 Hrs
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.

Attempt all the questions.

1. a) Discuss the importance of Computer Graphics for the Engineering fields. [7]
b) Compare and contrast between raster scan display and random scan display. [8]

2. a) How long would it take to load a 640 by 480 frame buffer with 12 bits per pixel, if 105 bits can be transferred per second? How long would it take to load a 24-bit per pixel frame buffer with a resolution of 1280 by 1024 using this same transfer rate? [7]
b) Define the following terms: [8]

i. Modeling coordinates
ii. Device Coordinates
iii. World coordinates
iv. Normalized coordinates

OR
How do you apply symmetry concept while drawing circle. Use midpoint algorithm to digitize circle with radius 10 and centre at (4, 3). [8]

3. a) Consider a triangle ABC with vertices A(1,1), B(6,1), C(6, 6). Obtain the transformed coordinates for this triangle after rotating it about an angle 90˚ and about a reference point (xr, yr) = (3,3). [8]
b) Derive the Bresenham’s line drawing algorithm for |m| > 1. [7]

4. a) What are the different graphical packages available currently? Explain about the few functions associated with any one of them. [8]
b) What is projection? Derive the expression and matrix representation for perspective projection. [7]

5. a) Write down the equation for illumination model at any point due to different light sources. Also, consider the attenuation factor. [8]
b) How can you use depth buffer method for hidden surface problem? [7]

6. a) Write the steps involved in rotating a 3-D object about an axis that is not parallel to any of the coordinate axes. Also, represent the steps in homogeneous coordinate matrix form. [7]
b) What is meant by a project? Explain briefly about project life cycle? [8]

7. Write short notes on any two: [2 × 5]

a) Frame buffer
b) Cohen-Sutherland line clipping algorithm
c) Graphics language

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