[away3d] How to make a character or object striking the ground?

[Wenderson]

How to make a character or object does not pass the ground or collide
with the ground, as in this example
(http://www.brighthub.com/hubfolio/matthew-casperson/media/p/
49485.aspx) ???

Att. Wenderson Pires
http://www.wpdas.com.br