Thanks a whole lot for all the effort, Egon, I appreciate it, man. Now just make the SimpleVector Interact2D.reprojectToWorlspace() already. :- ) Seriously, other than basic rendering, screenspace/worldspace interaction is the most important thing a 3d engine that draws on a 2d plane can do. But either way, thanks for the incredible engine, by far the best and most intuitive one I've seen around (including commercial ones).