[ODE] ODE and performer

[Megan Fox]

The center of gravity will *always* be at 0,0,0.  You must design with
that in mind.  If you want to treat a different point as center of
your object, then offset the coordinates before applying them to your
simulation.  Not a complex operation at all, just a simple vector
subtraction or addition.

-Megan Fox

> I did the geomtransform...the box has to be rotated, but it is sinking
> because I move the center of mass.
> what is offset both the geom and point ? sorry, i didn't understand exactly.
> Could you explain more details?
>  
> I don't want to move center of mass because simulation is different. 
> I want to replace the reference point (0,0,0) by (0,0,-3).