Tribhuvan University

Institute of Science and Technology

2075

Bachelor Level / third-semester / Science

Computer Science and Information Technology( CSC209 )

Computer Graphics

Full Marks: 60 + 20 + 20

Pass Marks: 24 + 8 + 8

Time: 3 Hours

Candidates are required to give their answers in their own words as far as practicable.

The figures in the margin indicate full marks.

**Long Questions:**

**Attempt any Two questions:(2 x 10 = 20)**

1

Define window, viewport and viewing transformation. Let ABCD be the regular window with A(20, 20), B(90, 20), C(90, 70),and D(20, 70). Find the region codes for end points and use Cohen Sutherland algorithm to clip the lines P(10, 30) Q(80, 90).

2

List any two disadvantages of BSP tree method in visible surface detection. Make a comparision between Painter’s algorithm and A- Buffer algorithm.

3

Describe the architecture of raster scan display. Explain about sweep, octree and boundary representations for solid modeling.

**Short Questions:**

**Attempt any EIGHT questions:(8 x 5 = 40)**

4

Give some basic color model. Give the basic command to draw the pixel and polygon in OpenGL.

5

Trace the Bresenham’s Line drawing algorithm for the end points(1, 1) and (8, 5).

6

Derive the relation for three- dimensional translation and rotation.

7

What is the purpose of wireframe representation? Describe about boundary and space partitioning.

8

Plot the ellipse centered at (0, 0) with radius r_{x} = 8 and r_{y} = 6, using mid point ellipse drawing algorithm.

9

Define clipping. Discuss about cubic spline Interpolation.

10

How can we detect shadows in computer graphics? List the challenged in computing light model.

11

List some applications of VR. What might be the possible navigation techniques and manipulating interfaces in virtual reality? Justify.

12

Mention any two color command in OpenGL. Explain about Hermite curve.

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