Last Updated February 25, 2010

Texture Mapping

  1. What is texture mapping?
  2. What is a reason to use texture mapping rather than lots of little polygons
  3. What is the relationship between vector coordinates and texture coordinates? Illustrate your answer with a diagram.
  4. Compare and contrast point-sampled, bilinear, mipmap and tri-linear texture filtering? Outline each technique and the problem it solves.
  5. Describe possible aliasing problems associated with texture mapping.
  6. Outline three techniques to reduce aliasing in texture mapping.
  7. Describe and compare two techniques for smooth shading a mesh.
  8. What is texture mapping? Identify possible visual problems which can occur when objects are texture mapped. Discuss two techniques which can be used to reduce these visual problems?
  9. a The above diagram shows a planar square composed of two triangles. The square is textured with a regular checker pattern and the square is presented to the viewer at an angle (left-hand side is nearest to the viewer). The pattern shows some distortion, especially along the diagonal. Explain, with the aid of a diagram what has caused the distortion. Also explain how to render the texture to remove the distortion.
  10. Discuss the problem of linear interpolation and achieving perspectively correct texture mapping.
  11. What do the terms minification and magnification mean when referring to texture mapping?
  12. The image on the left below shows a texture composed of a regular grid. The image on the right below shows how the texture appears when rendered on screen and turned at a slight angle. What causes the rendered image to appear so different (strange bands)? Describe a texture rendering technique which would correctly render the texture without this visual problem?
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  13. Examine the in-game screenshots below. The texture map applied to the gates in the left picture seems to have an abrupt seam about one-third of the way from the end of the gate. What texture filtering was used? Why is there a seam? Describe a technique which would remove this artifact to produce the image on the right.
  14. What causes moire patterns in texture mapping
  15. Describe the advantages and limitations of the following texture filtering approaches
  16. What are Mip Maps? Give an example of when they are useful. Why are they used?

© Ken Power 1996-2016