JNTU PAPERS

JNTU III B.Tech Supplimentary Examinations, Aug/Sep 2008

Computer Graphics

(Computer Science & Engineering)

SET-III

1. (a) Explain the design issues in color CRT monitors.

(b) Distinguish between CRT monitors and direct view storage tube (DVST) devices.

2. (a) What is inside-outside test? What is its significance in polygon filling?

(b) Develop a flood-fill algorithm to fill interior of any specified polygon.

3. (a) What is meant by composite transformations?

(b) Write the general form of a scaling matrix with respect to a fixed point P(h,k) where the scaling factors in x and y directions are a and b respectively.

4. Compute the transformation matrix that maps a window with (wxmin,wxmax)=(2,2)and

(wxmax,wymax) =(4,6) onto a normalize device coordinated which has lower left corner at (0,0) and upper right corner at (1,1).

5. Drive the matrix form for the geometric transformations in 3-D graphics for the following operations.

(a) Translation

(b) Scaling

(c) Mirror reflections.

6. (a) Discuss about the characteristics of the following illumination parameters.

i. Diffuse refection

ii. Specular reflection and

iii. Refraction.

(b) At a surface point p, if the surface normal, light vector and sight vectors are given by n = j, L = -I + 2j-k and s = I + 1.5j + 05k respectively, find the vector of reflected ray and the angle it is making with surface normal.

7. (a) Distinguish zero-order, first-order and second-order continuity.

(b) What is the organization of control points followed in Bezier’s method to ensure second order continuity?

(c) What are the properties of Bezier’s curve?

8. Give a detailed note of the following rules of animation.

(a) Slow-in and Slow-out

(b) Stage the action.