# JNTU B-Tech II Semester Examinations, Computer Graphics, Apr/May 2008

JNTU PAPERS

JNTU B.Tech II Semester Examinations, Computer Graphics Apr/May 2008

(Computer Science & Engineering)

Time: 3 hours Max Marks: 80

All Questions carry equal marks

SET-III

1. List the operating characterstics of

(a) Raster refresh systems

(b) Vector refresh systems

(c) Plasma panel

(d) LCDs. [4×4=16]

2. (a) Use the mid-point method to derive a decision parameter for generating points along a straight line path with slope in the range 0 <m <1.

(b) Use the mid-point method and symmetry considerations propose a solution to

scan convert the parabola. x=y2 for the interval – 10 _ y _10. [8+8]

3. (a) Describe the transformation which reflects an object about an arbitrary line L.

(b) What is the relationship among rotation (R_) , inverse rotation (R?_) and coordinate rotation (R1_). [8+8]

4. (a) Give a brief note about two dimensional viewing functions. Give an example

which uses two dimensional viewing functions.

(b) Explain the Cohen-Sutherland line clipping algorithm. [8+8]

5. (a) Classify the reflections. What are the characteristics of each? Illustrate with suitable figures.

(b) Describe the Phong illumination model. Explain the parameters used in phong’s model. [8+8]

6. Derive the transformation which aligns the vector V = I + J + K such that it aligns with vector K along Z-axis. 

7. (a) Write an algorithm to that would test a given plane surface against a rectangular area to decide whether it is a surrounding, overlapping, inside or outside surface.

(b) Distinguish depth-sort and z-buffer algorithms. [8+8]

8. Explain the steps involved in transforming a sphere into a specified polyhedron.