Mouse. Slide the variables.
Allowed an option to show the pen size controlled by its z position. Also renamed some variables and changed the engine a little bit. Next mission: Back-face culling. 12/24/14:One love from @leszpio! Another love from @dapontes! A total of 7 loves from @s_federici, @The_Grits, @Bluenunchuck, @popwilson, and @Ihave2dogs!
