## Description

**Course Code : MCS-053**

**Course Title : Computer Graphics and Multimedia**

**Assignment Number : MCA(V)-053/Assignment/2018-19**

**Maximum Marks : 100**

**Weightage : 25%**

**Last Date of Submission : 15th October, 2018 (For July Session)**

**15th April, 2019 (For January Session)**

**Note: This assignment has 16 questions of 80 marks (each question carries**

**equal marks). Answer all the questions. Rest 20 marks are for viva voce. You**

**may use illustrations and diagrams to enhance explanations. Please go**

**through the guidelines regarding assignments given in the Programme Guide**

**for the format of presentation.**

Question1: Write Midpoint Circle Generation Algorithm. Computer coordinate

points of circle drawn with centre at (0,0) and radius 5, using

midpoint circle algorithm.

Question2: Discuss Shear Transformation with suitable example, write Shear

transformation matrix for Shear along X- axis, Y-axis and

Generalized Shear. Show that the simultaneous shearing shxy (a, b),

is not same as the shearing in x-direction, shx(a) followed by a

shearing in y-direction, shy(b).

Question3: Explain the scan line polygon filling algorithm with the help of

suitable diagram.

Question4: What is the role of light in computer graphics? Discuss the Lamberts

Cosine Law? Explain ambient .diffused and specular reflection. Give

general mathematical expression of each. And also the give the

mathematical expression to determine the Intensity when all three

type of reflections are available

Question5: What is frame buffer? How it is different from the display buffer?

How a frame buffer is used for putting colour and controlling

intensity of any display device?

Question6: Discuss the Taxonomy of projection with suitable diagram. How

Perspective projection differs from Parallel projection. Derive a

transformation matrix for a perspective projection of a point P (?, ?, ?)

onto a ?=4 plane as viewed from E (6, 0, 0)

Question7: Write Bresenham line drawing algorithm and DDA algorithm?

Compare both algorithms and identify which one is better and why?

Draw a line segment joining (4, 8) and (8, 10) using both algorithms

i.e. Bresenham line drawing algorithm and DDA algorithm.

8

Question 8: What is Bezier Curve? Discuss the Role of Bernstein Polynomial in

Bezier Curve. How Bezier curves contribute to Bezier Surfaces?

Prove the following properties of Bezier curve.

(i) P(u=1) = Pn (ii) P’(0) = n (P1-P0)

Given four control points PO (2, 2) P1 (3, 4) P2 (5, 4) and P3 (4,

2) as vertices of Bezier curve. Determine four points of Bezier Curve.

Question9: What is the advantage of using homogenous co-ordinate system over

Euclidean coordinate sstem? Consider the square ABCD with

vertices A(0, 0),B (0, 2),C (2, 0), D (2, 2). Perform a composite

transformation of the square by performing the following steps.

(Give the coordinates of the square at each steps).

(i) Scale by using ?? = 2 and ?? = 3

(ii) Rotate of 450

in the anticlockwise direction

(iii) Translate by using ?? = 3 and ?? = 5

Question10: Derive the 2D-transformtion matrix for reflection about the line

? = ??, where ? is a constant. Use this transformation

matrix to reflect the triangle A (0,0) ,B(1, 1), C(2 ,0) about the line

? = 2?.

Question11: Why Shading is required in Computer Graphics? Briefly Discuss the

role of interpolation technique in Shading. Compare intensity

interpolation and Normal Interpolation? Which Interpolation

technique contributes to which type of shading? Which shading

technique is better Phong shading or Gourand shading, why?

Question12: Write Z-Buffer Algorithm for hidden surface detection. Explain

how this algorithm is applied to determine the hidden surfaces.

Question13: What is animation? How it is different from Graphics? Explain

how acceleration is simulated in animation? Discuss all the cases

i.e. zero acceleration, Positive acceleration, Negative acceleration

and combination of positive and negative acceleration.

Question14: What is windowing transformation? Discuss the real life example

where you can apply the windowing transformation? Explain the

concept of window to view port transformation with the help of

suitable diagram and calculations.

9

Question15: Write and explain the pseudocode for Sutherland Hodgman

polygon clipping algorithm. Using this algorithm clip the

following polygon against the rectangular window ABCD as given

below.

Question16: Explain any five of the following terms with the help of suitable

diagram/example, if needed.

(a) Ray Tracing (b)Ray Casting.

(c) Object-space approach in Visible-surface detection.

(d) Audio file formats (e) Video file formats (f) Image filtering

(g) Authoring tools (h) Animation and its types

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