phys2d question: is there a way to detect when a collision has occured?

Game Mechanics
#1

and if possible, how strong the impact of collision was?

i want to make it such that when a ball bounces against something, it will play a corresponding sound…

#2 

    ArbiterList arbs = world.getArbiters();
    for (int i=0;i<arbs.size();i++)
    {
      Arbiter arb = arbs.get(i);
 
      Contact[] contacts = arb.getContacts();
      int numContacts = arb.getNumContacts();
			
      for (int j=0;j<numContacts;j++)
      {
	// There is a contact : contacts[j] . You can know body involve in the contact, the position of the contact...
      }
    }

Yes there is ;). I use this to generate sparks when ttwo objects collided.

#3

You can also use a collision listener to achieve this.

Kev

#4

Yeah, but that only tells you on the initial collision, which I personally find only partially useful. I want to know either when two objects stop collision, or constantly every step() they are colliding. CollisionListener doesn’t do this, as far as I know.