Actor actor1 = WorldPhysX.getActorById(actorid1);
Actor actor2 = WorldPhysX.getActorById(actorid2);
contactPair.setActor1(actor1);
contactPair.setActor2(actor2);
// get world
WorldPhysX world = actor1.getWorld();
// System.out.println(actor1+" "+actor2+" "+world);
// if(2+2==4) return;
contactPair.setSumFrictionForce(new Vector3f(sumFrictionForce_x, sumFrictionForce_y, sumFrictionForce_z));
contactPair.setSumNormalforce(new Vector3f(sumNormalForce_x, sumNormalForce_y, sumNormalForce_z));
contactPair.setFlags(flags);
// call listeners
CollisionListener listener = world.getListener();
listener.onContactNotify(contactPair);
}