Download AKTU B-Tech 4th Sem 2016-17 Computer Graphics Question Paper

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B.TECH.

THEORY EXAMINATION (SEM–IV) 2016-17

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COMPUTER GRAPHICS

Time: 3 Hours

Max. Marks : 100

Note: Be precise in your answer. In case of numerical problem assume data wherever not provided.

SECTION – A

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1. Explain the following: 10 x 2 = 20
   1. Why do we need video controller?
   2. Trace the points for drawing a line from (0,0) to (-6,-6) using simple DDA algorithm.
   3. Define refresh buffer.
   4. Give the transformation matrix for rotation about an arbitrary point P in space.
   5. Prove that the two successive rotations are commutative.

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   6. Write how shear transformation works.
   7. List the properties of B-spline curves.
   8. Differentiate between specular reflection and diffuse reflection.
   9. How a viewport differs from the window?
   10. What do you mean by aliasing and antialiasing? Give examples

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SECTION – B

2. Attempt any five parts of the following questions: 5 x 10 = 50
   1. Develop the Bresenham's line drawing to draw lines of any scope. Compare this with the DDA Algorithm.
   2. Given a 25cm x 20cm display operating in 1024 x 768 x 16 color mode which is refreshed 30 times per second, and for which 10% of the refresh cycle is spent in retrace, calculate
      1. the pixel aspect ratio,
      2. the size of the frame buffer, and

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      3. the required data transfer rate in kilobytes per second.
   3. Given a window bordered by (1,2) at the lower left and (16,12) at the upper right, give the screen coordinates of a triangle with vertices (3,2), (10,7.5) and (5,5) when mapped into a viewport with corners (100,100) and (400,200). Provide accurate illustrations of the window, viewport, and the untransformed and transformed triangles with your answer.
   4. Explain the essential difference between the "Scan-Line" hidden surface removal algorithm and the depth buffer technique.
   5. Write the way of clipping a line using Cohen Sutherland algorithm.

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   6. Give a detailed explanation about quadratic surfaces and polygon surfaces.
   7. Write down the detailed description of Warn model.

SECTION - C

3. Attempt any two parts of the following questions: 2 x 15 = 30
   1. The figure ABCD where A=(-2,0), B=(0,-2), C=(-2,-4) and D=(-4,-2) can be transformed into A'B'C'D' where A'=(1,-1), B'=(3,3), C'=(6,3) and D'=(4,-1) by the composition of simple transforms T2*H1*S1*R1*T1. Give the matrix form of these five transformations. Then express the composite transform using only one scale, one rotation and one translation.

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   2. Explain Area Subdivision algorithm with suitable figure? List the advantages and disadvantages of Area Subdivision algorithm.
   3. Discuss in detail about visible surface detection methods.

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