What? bla bla bla i'm lazy to describe thing better see below :P http://code.google.com/p/jiglibflash/ http://drawlogic.com/2009/01/12/as3-flashflex-3d-physics-engine-jiglibflash-based-on-jiglib-c-3d-physics-engine/ Then? it's said Flash but you still can compile with Flex, and yes even try with Away3D, what you waiting for? just do it! Required? Away3D 2.2.6 : http://away3d.googlecode.com/svn/tru