(SEM V) THEORY EXAMINATION 2022-23 COMPUTER GRAPHICS

Course: B.Tech (Semester V)                                                         Subject Code: KCS-053

Subject Name: Computer Graphics                                             Time: 3 Hours

Total Marks: 100                                                                          Note: Attempt all sections.

 Section A – Short Answer Questions (2 × 10 = 20 Marks)

Answer all briefly:                                                                             Components of computer graphics

Aliasing and anti-aliasing                                                                 Curve clipping and text clipping

Importance of homogeneous coordinates in transformations

Meaning of transformation in computer graphics                           3D geometric primitives

Important terms used in projection

Difference between interpolation and approximation spline           Quadratic surfaces and explanation of a sphere

Types of coherence

Section B – Descriptive Questions (10 × 3 = 30 Marks)

Attempt any three:

Difference between Bresenham’s and DDA line drawing algorithms

Cohen–Sutherland line clipping algorithm and its limitations

3D clipping and problems encountered in perspective projections

Gouraud shading vs Phong shading – advantages and disadvantages

Hidden surface detection and explanation of Depth (Z) Buffer algorithm

Section C – Long Answer Questions (10 × 5 = 50 Marks)

Question 3

(a) Explain Shadow Mask CRT, its advantages and disadvantages
or
(b) Find the mirror reflection of triangle A(0,3), B(2,0), C(3,2) about the line passing through (1,3) and (–1,–1).

Question 4

(a) Describe Weiler–Atherton Polygon Clipping Algorithm with example
or
(b) Use Sutherland–Cohen Algorithm to find visible portion of line P(40,80)–Q(120,30) for clipping window A(20,20), B(60,20), C(60,40), D(20,40).

Question 5

(a) Define Projection. Differentiate between Parallel and Perspective Projection with diagrams.
or
(b) Explain 3D clipping and issues in Perspective Projection.

Question 6

(a) Explain B-Spline Curves and their properties.
or
(b) Role of Bezier Curves in designing surfaces and their properties.

Question 7

(a) Describe Back-Face Removal Algorithm and its limitations.
or
(b) Explain Phong Illumination Model.