teaching machines

CS 455 Lecture 7 – Diffuse Lighting and Rotational Power

February 12, 2013 by Chris Johnson. Filed under cs455, lectures, spring 2013.

Before Class

Dot Product and Diffuse

• Watch http://youtu.be/WUU_l1IX2As.
• Watch http://youtu.be/MBSvCUWdOhU.
• For some other perspectives, read http://ogldev.atspace.co.uk/www/tutorial18/tutorial18.html (stopping at Code Walkthrough) and http://en.wikibooks.org/wiki/Cg_Programming/Unity/Diffuse_Reflection (stopping at Shader Code for One Directional Light Source).

Accumulating Transformations and Rotation++

• Watch http://youtu.be/tlLiJpL1BbE.
• Read http://www.sjbaker.org/steve/omniv/eulers_are_evil.html.

In Class

• Implement a renderer that lets you spin a shaded cylinder (in cylinder.obj in W455). The cylinder is aligned with the Y axis and has a radius of 0.5. Like a sphere, its normals are derivable from its vertex positions. Think with your partner how they might be calculated, but call upon me if the answer doesn’t well up in your brain after a minute of thinking.
• If you have time, make your light source move. Here’s where you can make the sun orbit Earth.

Haiku