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Computer Graphics

8.7 Review Questions

1. “Spline is defined as a parametric curve that can be well-defined by control points.” Do you agree?
Justify.
2. “The set of polygon surfaces are the most commonly used 3-D graphics object representation.“
Discuss.
3. “Its flexibility is improved by raising the order of the basis function resulting in defining the
polygon/grid lines.” Describe.
4. “A continuous map from a one-dimensional space to an n dimensional space is known as a curve
in mathematical terms.” Elaborate.
5. “Polygon rendering is used to create images that are 3-D in nature.” Discuss.
6. “Gourand and Phong shading are quite different.” Explain.
7. Transformations are used in mapping spaces along the graphics pipeline. Explain the different
transformations.

8. “Rotation for three-dimensional objects is possible.” Justify.
9. “Shears distort the shape of an object.” Explain.
10. “The world position coordinates are converted into viewing coordinates and projected into the
view plane.” Describe.
11. “An orthographic projection is a parallel projection if the projection lines are all normal to the view
plane.” Analyze.
12. “The view volume must be set to a particular direction to view an object in the correct manner.”
Explain.
Answers – Self Assessment

1. (a) True (b) True (c) False (d) false (e) False (f) False
2. (a) Cubic (b) View plane (c) Visible (d) Individual (e) Projections
3. (a) Curves (b) In between the space (c) Clipping (d) Polygon mesh
8.8 Further Readings

Godse, A.P.(2005).Computer Graphics, 1 ed. India: Technical Publications
st
Xiang, Z., & Plastock, R.A.(2010). Computer Graphics, 2nd ed. USA: McGraw-Hill
companies

http://www.slidefinder.net/c/computer_graphics_clipping/12155743
http://www.scribd.com/doc/7075120/Curves-and-Surfaces-for-Computer-Graphics
http://faculty.umf.maine.edu/daniel.jackson1/public.www/Computer%20Graphics.htm

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