[ODE] dynamic to static body

[Jon Watte (ODE)]

Just remove the body from the world, and keep the geom static, for the 
object you don't want to simulate.

Jian Chen wrote:
> Basically, it is a simple scene with blocks.. and users can add  
> blocks and move and stack them together as well. However, I want to  
> have whatever already build keep static and only the newly added  
> block perform collision with existing ones (added previously).
>