[Virtools] Bump!!!

Hi,
I wanna create a Bump Mapping effect with 2.1
I've played with the Env Bump effect option but with strange results.Could someone explain how, for example create a Cube with Rocks bumped?
Thanx.
I used the Map, The bump (grayscale) map, but is not real bump mapping....
I know how to do it with DirectX, but not with Virtools!

     Giuseppe Crugliano
Game Designer/Programmer
Mobile: +39 329 5457012
Studio: +39 (0)962 24186
-------------------------------------------------------------------------------------
                             A R T E M A T I C A
                           hi technology digital arts

          Life is not a Videogame, don't play with your life.

- Phone : +39 (0) 185 324660 - Fax : +39 (0) 185 368490
- Mail artematica@artematica.com - Web www.artematica.com
--------------------------------------------------------------------------------------