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

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2016-17 Computer Graphics Question Paper

Printed Pageszl RouNo.| | | | | | | | | | | NCS403
B.TECH.
THEORY EXAMINATION (SEM?IV) 2016-17
COMPUTER GRAPHICS
T ime : 3 Hours Max. Marks : 100
Note .' Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 X 2 = 20
(a) Why do we need Video controller?
(b) Trace the points for drawing a line from (0,0) to (-6,-6) using simple DDA algorithm.
(c) Define refresh buffer.
(d) Give the transformation matrix for rotation about an arbitrary point P in space.
(e) Prove that the two successive rotations are commutative.
(1) Write how shear transformation works.
(g) List the properties of B?spline curves.
(h) Differentiate between specular re?ection and diffuse re?ection.
(i) How a Viewport differs from the window?
(j) What do you mean by aliasing and antialiasing? Give examples
SECTION ? B
2. Attempt any ?ve parts of the following questions: 5 X 10 = 50
(a) Develop the Bresenham?s line drawing to draw lines of any scope. Compare this with
the DDA Algorithm.
(b) Given a 250m X 200m 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
(i) the pixel aspect ratio,
(ii) the size of the frame buffer, and
(iii) the required data transfer rate in kilobytes per second.
(c) 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), (10,75) 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.
(d) EXplain the essential difference between the "Scan-Line" hidden surface removal
algorithm and the depth buffer technique.
(e) Write the way of clipping a line using Cohen Sutherland al gorithm.
(1) Give a detailed explanation about quadratic surfaces and polygon surfaces.
(g) Write down the detailed description of Warn model.
SECTION ? C
Attempt any two parts of the following questions: 2 X 15 = 30
3 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*Sl*R1*T1. Give the matrix form of these
five transformations. Then express the composite transform using only one scale, one
rotation and one translation.
4 Explain Area Subdivision algorithm with suitable figure? List the advantages and
disadvantages of Area Subdivision algorithm.
5 Discuss in detail about Visible surface detection methods.