CS 2401/C8 71 - COMPUTER GRAPHICS MAY/JUNE 2013.

B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2013.

Seventh Semester

Computer Science and Engineering

CS 2401/C8 71 - COMPUTER GRAPHICS

(Regulation 2008)

Time: Three hours Maximum : 100 marks

Answer ALL Questions.

PART A -(10x 2 = 20 marks)

1. Define aspect ratio?

2. How will you clip a point?

3. What are the advantages of B spline over Beizer curve?

4. What is critical Fusion Frequency?.

5. Draw the color model HLS double cone?

6. What is dithering?

7. Define rendering.

8. Differentiate flat and smooth shading?

9. Define fractals.

10. What is surface path?

PART B -(5 x 16 = 80 marks)

11. (a) Explain the basic concept of midpoint ellipse drawing algorithm.Derive the decision parameter for the algorithm and write down the algorithm steps.

or

 (b) Explain two dimensional Translation and scaling with an example (8)

      Obtain a transformation matrix for rotating an object about a specified pivot point (8)

12. (a) Determine the blending function for uniform periodic Bspline curve for n=4,d=4 (8)

          Explain anyone visible surface identification algorithm (8)

or

 (b) Explain a method to rotate an object about an axis that is not parallel to the coordinate axis with neat block diagram and derive the transformation matrix for the same

] 3. (a) Briefly explain different color model in details

 or

 (b) How will you model three dimensional objects and scenes in OPENGL explain with an example code.

14. (a) Explain the method of adding shadows to objects. (8)

 (b) Explain Gauraud shading techniques and write the deficiencies in that method and how it is rectified using phong shading techniques.(8).

Or

Explain how to add texture to faces(8)

How will you build and fix camera position in a graphics program?Explain(8)

l5. (a) Briefly explain different types of fractals with neat diagram and also explain how to construct fractals and the uses of fractals in computer graphics.

or

(b) Explain ray tracing method in detail (8)

Write short notes on applying Boolean operations on modeled objects to create new objects (8)

CS 2401/CS 71/10144 CS 702.— COMPUTER GRAPHICS NOVEMBER/DECEMBER 2013

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2013.
Seventh Semester
Computer Science and Engineering
CS 2401/CS 71/10144 CS 702.— COMPUTER GRAPHICS
(Common to Information Technology)
(Regulation 2008/2010)

Time: Three hours

Maximum :100 marks

Answer ALL questions

PART A (10x2=20marks)

1. Digitize a line from (10, 12) to (15, 15) on a raster screen using Bresenhams straight line algorithm. .

2. List the different types of text clipping methods available.

3. Give the general expression of Bezier Bernstein polynomial.

4. Give the single-point perspective projection transformation matrix when projectors are placed on the z-axis.

5 List any four real time animation techniques

6. How are mouse data sent to an OpenGL application? ,

7. Which shading method is faster and easier to calculate? Why? ,

8. What are the types of reflection of incident light?

9. Where does the ray r(t) (4; 1, 3) + (—3, —5, —3)t hit the generic plane?

10 How objects are modelled using constructive solid geometry technique?

                                                            PART B — (5 x 16= 80 marks)
11. (a) (i) Calculate the pixel location approximating, the first octant of a circle having centre at (4, 5) and radius 4 units using Bresenhams algorithm. (8)
ii) Discuss in brief: Antialiasing techniques. (8)
Or
(b) (i) A polygon has four vertices located at A(20, 10) B(60, 10) C(60, 30) D(20, 30). Calculate the vertices after applying a transformation matrix to double the size of polygon with point A located on the same place. (8)
(ii) The reflection along the line y = x is equivalent to the reflection along the X axis followed by counter clockwise rotation by O degrees. Find the value of Theta. (8)
12. (a) (i) A cube has. its vertices located at A(0, 0, 10), B(10, 0,10), C(10, 10, 10), D (0, 10,10), E(0, 0, 0), F(10, 0, 0), G(10, 10, 0), 11(0, 10, 0). The Y axis is vertical and Z axis is oriented towards the viewer. The cube is being viewed from point (0, 20.80). Calculate
the perspective view of the cube on XY plane. (8)
(ii) Discuss on the various visualization techniques in detail. (8)
Or
(b) (i) Calculate the new coordinates of a block rotated about x axis by an angle of = 30 degrees. The original coordinates of the block are
given relative to the global xyz axis system.
A(1, 1, 2) B(2, I, 2) C(2, 2, 2) D(1, 2, 2) E(1, 1, 1) F(2, 1, 1) G(2, 2,1) 11(1, 2, 1).     (8)
(ii) Discuss on Area subdivision method of hidden surface identification
algorithm. (8)
13. (a) Discuss on the various colour models in detail. (16)
Or
(b) Discuss on the methods used in OPENGL for handling a window and also write a simple program to display a window on the screen. (16)

14. (a) Discuss on the process of adding textures to faces of real objects. (16)
Or
(b) Compare Flat shading and Smooth shading with respect to their
characteristics and types. (16)

15. (a) (i) Discuss the Ray tracing process with an example. (8)
(ii) Explain how refraction of light in a transparent object changes the
view of the three dimensional object. (8)
Or
(b) Write shot notes on:
(i) Mandelbrot sets. (5)
(ii) Fractal geometry. (5)
(iii) Boolean operations on objects. (6)

CS 2401/C8 71 - COMPUTER GRAPHICS MAY/JUNE 2012

B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2012.

Seventh Semester

Computer Science and Engineering

CS 2401/C8 71 - COMPUTER GRAPHICS

(Regulation 2008)

Time: Three hours Maximum : 100 marks

Answer ALL Questions.

PART A -(10x 2 = 20 marks)

1. What i s the major d i f f e r e n c e b e t w e e n s y m m e t r i c a l DDA and simple DDA?

2. What i s the ruse of clipping?

3. Differentiate parallel projection f r o m perspective projection,

4. Define viewing.

5. What a re subtractive colors?

6. What do you mean by temporal aliasing?

7. Define shading.

8. What is texture?

9. Define fractals.

10. What is Julia sets?

PART B -(5 x 16 = 80 marks)

11. (a) Explain about Bresenham's circle generating algorithm.

 (b) Write about Cohen-Sutherland's line clipping algorithm.

12. (a) Explain about 3D object representations.

 (b) Explain about 3D transformations.

] 3. (a) Compare and contrast between RGB and CMY color models.

 (b) Discuss about the methods for drawing 3D objects and scenes.

14. (a) Explain about shading models.

 (b) How do you create shaded objects and draw shadows? Explain.

l5. (a) Explain the followmg

 (i) Peano curves

 (ii)Mandelbrot sets

 (iii)Random fractals.

(b) Write notes on the following

(i) Ray tracing (6)

(ii) Reflection and transparency.(10)

CS 2401 / CS 71 - COMPUTER GRAPHICS NOVEMBER/DECEMBER 2012.

B.E. / B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2012.

Seventh Semester

Computer Science and Engineering

CS 2401 / CS 71 - COMPUTER GRAPHICS

(Regulation 2008)

Time: Three hours Maximum: 100 marks

Answer ALL questions

PART A - (10 x 2 = 20 marks)

1. Write down the shear transformation matrix.

2. Define text clipping.

3. Differentiate oblique and orthogonal projections.

4. Define spline curves.

5. State the difference between CMY and HSV color models.

6. What are keyframe systems?

7. What is a shadow?

8. Define texture.

9. List down the properties of piano curves.

10. Write down some of the Boolean operations on objects.

PART B - (5 x 16 = 80 marks)

11.(i) Line drawing algorithm. (8)

(ii) Line clipping algorithm. (8)

Or

 (b) With suitable examples, explain the following

(i) Rotational transformation. (8)

(ii) Curve clipping algorithm. (8)

12. (a) (i) Differentiate parallel and perspective (8)

(ii) Write notes on 3D viewing. (8)

Or

 (b) (i) With suitable examples, explain the 3D transformations. (8)

(ii) Write notes on quadric surfaces. (8)

13. (a) (i) Explain RGB color model in detail. (8)

(ii) Explain how 3D scenes are drawn. (8)

Or

 (b) (i) Discuss the computer animation techniques. (10)

(ii) Explain how 3D objects are drawn. (6)

14. (a) Differentiate flat and smooth shading models. (16)

Or

 (b) Discuss the methods to draw and add shadows to objects. (16)

15. (a) Write notes on the following

 (i) Mandelbrot sets (8)

(ii) Julia sets. (8)

Or

 (b) (i) Describe the creation of images by iterated functions. (8)

(ii) Explain the method for adding surface texture. (8)