Bug / Crash Errors when ending playmode

[josemendez]

I'm sorry but without 5.1 API docs it's hard to figure out how to iterate over all particles. Do I get them through the Obi rope or the solver? What is an element vs a particle? An element is a connection between two particles? but i cannot get the velocity of a single particle?

Hi,

Elements are a logic "connection" between two particles. You don't need to use them at all, not for your purpose. They're mostly used to change the topology of the rope, when resizing a rope or tearing it.

You have several examples of particle iteration in the manual:
http://obi.virtualmethodstudio.com/tutor...icles.html

In your particular case, you only have one actor (rope) per solver, so it does not really matter if you iterate over the actor's solverIndices array, or over the solver data arrays directly. So you could either do what's done in the manual:

Code:

// Iterate over all particles in an actor:
for (int i = 0; i < actor.solverIndices.Length; ++i){

    // retrieve the particle index in the solver:
    int solverIndex = actor.solverIndices[i];

    // look up the particle velocity:
    if (actor.solver.velocities[solverIndex] ...etc)
       {
       }
}

or

Code:

// Iterate over all particles in the solver:
for (int i = 0; i < actor.solver.velocities.Length; ++i){

    // look up the particle velocity:
    if (actor.solver.velocities[i] ...etc)
       {
       }
}

This last method will only work correctly if there's exactly one actor in the solver, though. As you add/remove actors from a solver, particles are reassigned to different actors and the actor's solverIndices array is the only consistent way to access solver data arrays. (You can think of Obi as an ECS system, where particles are entities, and the constraint groups are components.)

So all that's left to do is check if the velocity magnitude of each particle is over a threshold. If you find that all particles are under the threshold, you can disable the solver.