Help Rope Collision Detection

[kripa1415]

Hi,
 I have 3 ropes tanged. I am untangling first rope and avoided collision from the other 2 ropes. How do I detect this ?
 I have the on collision subscribed on the solver and getting the contacts. But I want to filter rope wise

RopeGenerator.solver.OnParticleCollision += Solver_OnParticleCollision;

private void Solver_OnParticleCollision(ObiSolver solver, ObiSolver.ObiCollisionEventArgs contacts)
{
   
    if (contacts.contacts.Count <= 0)
    {
        
    }
    else
    {
        
    }
}