Help Detect specific rope collision.

[josemendez]

Hi again Jose!
I'm trying to detect if NO collision between different ropes happens at the Update, but don't understand how to do it..
Look, here's a short script (actually it is slightly changed CollisionHandler from obi samples):

Code:

public class RopeCollision : MonoBehaviour {

ObiSolver solver;

Obi.ObiSolver.ObiCollisionEventArgs frame;

void Awake(){
solver = GetComponent<Obi.ObiSolver>();
}

void OnEnable () {
solver.OnParticleCollision += Solver_OnCollision;
}

void OnDisable(){
solver.OnParticleCollision -= Solver_OnCollision;
}

void Solver_OnCollision (object sender, Obi.ObiSolver.ObiCollisionEventArgs e)
{
foreach (Oni.Contact contact in e.contacts)
{
// this one is an actual collision:
if (contact.distance < 0.01)
{
ObiSolver.ParticleInActor pa = solver.particleToActor[contact.particle];
ObiSolver.ParticleInActor po = solver.particleToActor[contact.other];
if (pa.actor.gameObject != po.actor.gameObject)
{
Debug.Log("rope collides: " + pa.actor.blueprint.name + " " + po.actor.blueprint.name, pa.actor.gameObject);
}
}
}
}

It works nice and triggers when ropes collides. But how to detect when they don't?

The collision callback gives you a list of all contacts every frame. So you know an actor isn't colliding, when you can't find a contact for that actor. Simple as that .

Just keep track of which actors appear in the contact list, and at the end of the callback (right after the foreach(contacts)), any actor that hasn't appeared isn't colliding with anything.