Computer Graphics - Jun 2014

Computer Engineering (Semester 6)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) Define the following terms:
(1) Aliasing
(2) Persistence
(3) Frame buffer
(4) Resolution
(5) Scan conversion
(6) Aspect ratio
(7) Antialiasing(7 marks) 1 (b) Write a short note on: (1) Cathode ray tube (2) Shadow mask(7 marks) 2 (a) Write and explain the boundary fill algorithm and flood fill algorithm.(7 marks) 2 (b) Write and explain the midpoint circle generating algorithm.(7 marks) 2 (c) Write and explain the midpoint ellipse drawing algorithm.(7 marks) 3 (a) Prove that the reflection of a square ABCD [(2,2), (4,2), (4,4), (2,4)] about x axis (y =0) and then rotation of the resulting square about 60° will not be same if the order of(7 marks) 3 (b) Write a short on: (1) 2D Rotation (2) Reflection about an arbitrary line(7 marks) 3 (c) Solve the followings: Locate the new position of the triangle [(5,4), (8,3), (8,8)] after its rotation by 90° clockwise about the Centroid(7 marks) 3 (d) Write a short on: (1) 2D Reflection (2) Rotation about an arbitrary point.(7 marks) 4 (a) Define Clipping. Write and explain Cohen ? Sutherland line clipping algorithm.(7 marks)

Answer the following:

4 (b) 1) What do you mean by view plane?(1 marks) 4 (b) 2) What is type face?(1 marks) 4 (b) 3) Define: B-Spline curve(1 marks) 4 (b) 4) What is Polygon mesh?(1 marks) 4 (b) 5) What is surface patch?(1 marks) 4 (b) 6) What is a spline?(1 marks) 4 (b) 7) What are the different ways of specifying spline curve?(1 marks) 4 (c) Define Clipping. Write and explain Liang-Barsky line clipping algorithm.(7 marks)

Answer the following:

4 (d) 1) What is the need of homogeneous coordinates?(1 marks) 4 (d) 2) What is Transformation?(1 marks) 4 (d) 3) What is cubic spline?(1 marks) 4 (d) 4) What is Bezier Basis Function?(1 marks) 4 (d) 5) What is bitmap and what is pixmap?(1 marks) 4 (d) 6) List out the important properties of Bezier Curve.(1 marks) 4 (d) 7) Differentiate between interpolation spline and approximation spline?(1 marks) 5 (a) List out the different types of projections and explain any two in detail.(7 marks) 5 (b) Explain XYZ colour model.(7 marks)

Write a short note on:

5 (c) (i) Back face detection method.(3 marks) 5 (c) (ii) Depth buffer method for detection.(4 marks) 5 (d) Explain CMY colour model.(7 marks)