As the demo video shows, you can have two or more objects collide @ deform, depending on mass and internal pressure. ( and lots of other options )
Very flexible...... Have fun.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!