teaching machines

CS 455 Lecture 6 – Matrices

February 12, 2015 by Chris Johnson. Filed under cs455, lectures, spring 2015.

Agenda

• what ?s
• dot product
• recasting rotation, scaling
• homogeneous coordinate
• recasting translation
• a Matrix4 class

TODO

• Read about calculating normals and shading. I encourage you to read a few other sources as well. Bring a 1/4 sheet with 3-4 questions or observations. You are welcome to answer any these challenge questions:
  • If a light is infinitely far away, what can you say about how it hits different points of a surface?
  • What happens when a red light illuminates a green surface?
  • How is it that we can use the dot product to get the cosine of the angle between the normal and light vectors?
  • How would you calculate a fragment’s “litness” given multiple light sources?
  • Does a diffuse surface’s appearance change as the viewer moves around a scene? Why or why not?

Code

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Haiku