**JNTU B.Tech II Semester Examinations, COMPUTER GRAPHICS, Apr/May 2008**

**(Computer Science & Engineering)**

**Time: 3 hours Max Marks: 80**

**SET-IV**

Answer any FIVE Questions

All Questions carry equal marks

1. (a) Assuming that a certain full-color (24-bit per pixel) RGB raster system has a 512 by 512 frame buffer, how many distinct color choices (intensity levels) would be available.

(b) Explain how virtual reality systems can be used in design applications. [10+6]

2. (a) Write an algorithm for generating the intermediate points using Bresenhams algorithm when two-end points are given as input.

(b) Write an algorithm for polyline function which calls the above algorithm, given any number (n) of input points. A single point to be plotted when n=1. [8+8]

3. Show that the transformation matrix for a reflection about the line y = -x is equivalent to a reflection relative to the y-axis followed by a counter clockwise rotation of 900. [16]

4. (a) What are the basic transformation techniques used in Window-to-Viewport

transformation? Derive the viewing transformation matrix.

(b) What is the significance of 4-bit region code is Cohen-Sutherland algorithm? [8+8]

5. (a) State the boundary conditions that defines the Hermite curve section.

(b) Derive the Hermite matrix.

(c) Explain how the Hermite blending functions are derived. [4+4+8]

6. (a) What is the procedure for reflecting an about an arbitrarily selected plane.

(b) What are the characterstics of perspective projections? [8+8]

7. (a) How does the basic scan-line method determine which surfaces are hidden.

(b) How does edge coherence help to reduce computational effort. [8+8]

8. (a) Explain how the linear interpolation is implemented when the key-frame positions of an object are given.

(b) Describe linear list notation of animation languages. [16]