I'm just starting with Babylon.js and I want to create a set number of boxes depending on which keystroke I issue. That is, press an 'a' and get one box, 'b' gives me two boxes, '1' gives me something else, etc. I could register a javascript onkeypress listener in the normal way but I don't want to interfere with the arrow key rotation functionality. Is there a preferred way to handle keystrokes?