I think that need to join shape toggether but that need to be possible (i try a lot but dont work for me), i want to let user draw free shape and add Physics to that shape.
like that:
Create non-convex, complex shapes with Box2D | Emanuele Feronato
ot that:
From PNG to Box2D – first attempt | Emanuele Feronato
or that:
How to create destructible terrain using Box2D – step 2 | Emanuele Feronato