gistfile1.txt

everything above the big '////////' line (line 61) is a hack i threw 
together which averages some frames to achieve a motion blur effect; 
i just copy 'n' paste it every time i make a new sketch, and think of 
setup_() as setup() and draw_() as draw().

the variable 't' controls time and runs from 0 to 1.

the bit fiddling is just a faster way of pulling the red, green and 
blue values out of pixels, if i recall correctly.