CS602 Midterm Past Paper 2005

CS602 Computer Graphics · Mid Term Examination – February 2005 · Time Allowed: 90 Minutes · Instructions

1. This examination is closed book, closed notes, closed neighbors.

Q2. Answer all questions.

1. There is no choice.
2. You will have to answer correctly all questions in this examination to get the maximum possible marks.
3. You are allowed to use any Software for Diagrams and Symbols like MS Word, MathType and Visio etc.

NOTE:

For your convenience we are providing you the following symbols, so that you can copy them & paste wherever they are needed in the respective questions.

� ,, Ø,

, an,θ,�

Q1. What is Rendering?

Q2. The circle and ellipse are symmetric across 8 octants.

o True o False

Q3. UV light is used in Plasma Panel displays to excite phosphor.

o True o False

Q4. Which of the following is not true about matrices:

Total Questions: 22 · Marks : 05 · Marks : 01 · Marks : 01 · Marks : 01

o o o o A+B = B+A a(A + B) = aA + aB (AT)T = AT A + (B + C) = (A + B) + C

Q5. Marks : 05

Why is the Bresenham's line drawing algorithm more efficient than the DDA line drawing algorithm? Give precise one line answer.

Q6. According to Odd Parity Rule, a point is inside the polygon, if:

Marks : 01

o o o o Line from an outside point to this point does not cross the edges odd number of times Line from any point to this point crosses the edges odd number of times Line from an outside point to this point crosses the edges odd number of times Line from this point to any point outside the polygon intersects any edge

Q7. Marks : 01

As opposed to direct memory access method, BIOS routines provide an easier and faster method of drawing pixels on screen.

o True o False

Q8. Describe the Right Handed Rule for determination of direction of axes.

Q9. What is Viewing Frustum?

Q1. How is the efficiency of circle drawing algorithms improved?

Q1. Marks : 06

Marks : 05 · Marks : 05 · Marks : 01 · A Polygon is complex, if the line connecting:

o Any two points outside the polygon intersects its boundary o Any two points inside the polygon intersects its boundary o A point inside the boundary with any point outside, does not intersect the polygon boundary o Any two vertices, intersects some edge of polygon.

Q1. Marks : 01

When a point P(x,y) is rotated by θ the coordinates of transformed point P' are given as:

o o o o x' = x cos(θ) – y sin(θ), x' = y cos(θ) – x sin(θ), x' = x cos(θ) + y sin(θ), x' = y cos(θ) + x sin(θ), y' = x sin(θ) + y cos(θ) y' = y sin(θ) + x cos(θ) y' = x sin(θ) – y cos(θ) y' = y sin(θ) – x cos(θ)

Q1. Marks : 01

The amount of time it takes to illuminate a specific location on phosphor coated screen is called Persistence. o True o False