https://www.youtube.com/watch?v=rqhAOc9gvC4

Create a perspective projection matrix. http://youtu.be/dul0mui292Q

Building a quaternion from an axis-angle rotation. http://youtu.be/SCbpxiCN0U0

Rotation of a vector around an axis by theta degrees. https://www.youtube.com/watch?v=dttFiVn0rvc

From: http://en.wikipedia.org/wiki/HSL_and_HSV#Converting_to_RGB

Make this character move along with the parent character http://youtu.be/KI0KZzqC6sA

Composite Simpson's Rule, Burden & Faires - Numerical Analysis 9th, algorithm 4.1

Spherical linear interpolation of a quaternion http://youtu.be/x1aCcyD0hqE

Trace a line through the world to simulate, eg, a bullet http://www.youtube.com/watch?v=USjbg5QXk3g

If we are using a non-qwerty layout, find the localized key that matches this letter's position in qwerty.

If we are using a non-qwerty layout, find the qwerty key that matches this letter's position on the keyboard.

Not worried about supporting these on Linux right now.

Returns a triangle wave on the interval [0, 1]

In this Update() function we need to update all of our characters. Move them around or whatever we want to do. http://www.youtube.com/watch?v=c4b9lCfS

Rounds x up to the nearest multiple of n. Useful for aligning memory.

Rounds v up to the next highest multiple of 2.