About
Formula Sketches is a series of visual notes on game-development math.
Who it is for
Game and graphics programmers who use a formula every day and want to see what it actually does to a picture.
Which formulas qualify
A formula belongs here when changing its values changes a picture. If moving a number does not move something you can see, it is not a sketch.
What is here now
The series currently contains one sketch: the perspective divide.