Code: DC-09                                                                          Subject: COMPUTER GRAPHICS

Time: 3 Hours                                                                                                     Max. Marks: 100

NOTE: There are 11 Questions in all.

· Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the boxes provided on page 1. Tear this sheet and attach it to the main answer book.

·  Answer any THREE Questions each from Part I and Part II.

· Any required data not explicitly given, may be suitably assumed and stated.

ROLL NO.

Q.1            State which of the statement is true and which are false. (Tick the box)            (2x8)

a. A spaceball provides 6 degrees of freedom of movement.

TRUE

FALSE

b. The dull surfaces do not reflect light that is incident on them.

TRUE

FALSE

c. In mapping transformations, a view port is mapped to a window.

TRUE

FALSE

d. Non-linear traversal of a document is possible using hypertext.

FALSE

TRUE

e. Cavalier projections are a type of axonometric parallel projections. 

FALSE

TRUE

f. Reflection is a rigid body transformation.

TRUE

FALSE

g. For n + 1 control points, the B-spline curve is described with n blending functions.

FALSE

TRUE

             h.  Fractal geometry is a modeling technique.

TRUE

FALSE

CENTRE STAMP                

                                                                                                Signature of Suptd/invigilator

PART I

Answer any THREE Questions. Each question carries 14 marks.

Q.2     a.   Using Bresenhem’s circle drawing algorithm, draw a circle with center      (-1, 2) and radius 3.                                                                   (10)

b.   Describe the working of plasma panel displays.                                                   (4)

Q.3     a.   What do you understand by frame buffers and lookup tables in color CRTs?  Explain how they work with the help of an example.                        (7)

b.   Prove the following :

(7)

Q.4     a.   Derive the matrix for rotation about an arbitrary point.                                         (7)

             b.   Reflect the polygon with vertices and D (0, 2) about y = x + 2.             (7)

Q.5     a.   Describe Cohen Sutherland line clipping algorithm.                                              (8)

             b.   Briefly explain different kinds of light reflecting sources?  Give examples also.                      (4)

             c.   What do you understand by bar graphs?  Explain with the help of examples.                      (2)

  Q.6     a.    Discuss the application of computer Graphics in  (i) Education  (ii) CAD           (10)

     b.   Differentiate between Bezier and B-spline curves.                                               (4)

PART II

Answer any THREE Questions. Each question carries 14 marks.

Q.7     a.   What do you understand by diffuse reflections?  Briefly explain the significance of diffuse reflection coefficient and ambient-reflection coefficient in computations of diffuse reflections.               (7)

b. Briefly explain sweep solid representation with the help of an example.               (7)

Q.8     a.   Describe the floating horizon algorithm for visible surface detection.                     (7)

             b.   What do you understand by first order parametric continuity?  What are the conditions for getting such continuity in Bezier curves?                  (7)

Q.9     a.   Explain scan line seed fill algorithm with the help of an example.                         (10)

b. What are B-spline cubic curves?  Give an example of open uniform         B-splines.            (4)

Q.10           a.                                                        Derive the transformation matrix for oblique projections.      (8)

b.   Briefly explain how analog audio signal is converted to digital signal.                    (6)

Q.11                                                                      Write short notes on (Any FOUR):-

(i) Use of graphics in simulation.

(ii) Touch panels.

(iii) Hypermedia and its advantages.

(iv) Video conferencing.

(v) MIDI.                                                                            (3.5 x 4 = 14)