[ODE] Expand a mesh with a sphere

[tullio.molitierno at libero.it]

Hi to all!!
 
I need to do create a  sphere that is expanded increasing one mesh to tube shape.
 
1. Can I model the expanding sphere destroing the geometry and re-creating it as
the radius increas;
 
2. How can I move the mesh when the sphere collides;
 
Thanks to all
 
Tullio