Punjab Technical University 2005 M.C.A COMPUTER GRAPHICS (N2) 501 - Question Paper

COMPUTER GRAPHICS (N2) MCA 501 fifth Sem May 2k5


Max Marks 60

Note: part A is compulsory. Attempt any 4 ques. from part B and 2 from part C.

part A Marks: two every

1.
(a) What are the basic attributes of graphics storage systems used to evaluate competing storage systems?
(b) What is retrace blanking?
(c) What happens to the pictures that are too large to fit on the screen?
(d) Define word-size. What would be the maximum possible size of a computer’s instruction set if it were based on a processor with a 16-bit word size?
(e) How can the effects of aliasing be minimized?
(f) Find the formula of the line when its coordinates x and y are rotated by 90o?
(g) Compare the techniques of Phong and Gourard shading.
(h) What is rendering? elaborate various stages of rendering and image?
(i) Align the vector V = I + J + K with vector K.
(j) What is Bezier can B-spline curves?

part B Marks: five every

2. discuss the various algorithms used for region-filling. What steps are needed to be added to a fill algorithm if a region is to be filled with a pattern?

3. Why are hidden surface algorithms needed? How does the z=buffer algorithm determine which surfaces are hidden?

4. Perform a 45o rotation of triangle A (0,0), B (1, 1) , C (5,2) (a) about the origin (b) about (-1, -1).

5. obtain the matrix for mirror reflection with respect to the plane passing through the origin and having a normal vector whose direction is N = I + J + K.

6. What do you mean by projection? Classify its various kinds. elaborate the perspective anomalies?

part C Marks: 10 every

7. Draw a flowchart to illustrate the logic of Sutherland- Hodgman algorithm. discuss this method with 1 example.

8. (a) Let Po (0, 0), P1 (1, 2), P2 (2, 1), P3 (3, 1), P4 (4, 10) and P5 (5, 5) be provided data points. If interpolation based on B-splines is used to fine a curve interpolating these data points, obtain a kont set to……….., t9 that can be used to describe B-splines )Cubic B-splines).

(b) What is ray-tracing algorithm? elaborate its advantages?

9. (a) What steps are needed to plot a line whose slope is ranging from 45o and 90o using Bresenham’s method?

(b) explain and compare the working principles of the following:

(i) LCD’s
(ii) Raster scan
(iii) Vector Refresh.

Earning:   Approval pending.