Help Trying to add DistanceConstraint for my TearableCloth but getting IndexOutOfRange

[josemendez]

Hi!

When you add an actor to a solver, all its particle and constraint data are copied into the solver. Each particle in the actor -numbered from 0 to the amount of particles in the actor- is assigned a position in the solver's arrays, its position in the solver is its solver index. The range of a solver index is from 0 to the combined amount of all particles being simulated by the solver.

In your code, "colon" is probably an actor (cloth or softbody), not a solver. Is this correct?

If that's the case, you're retrieving the actor's constraints (whose particle indices run from 0 to the amount of particles in the actor):

Code:

var distanceConstraints = colon.GetConstraintsByType(Oni.ConstraintType.Distance) as ObiConstraints<ObiDistanceConstraintsBatch>;

But then you're passing indices of particles in the entire solver (which run from 0 to the total amount of particles in the solver):

Code:

// Add a constraint for the pair
batch.AddConstraint(new Vector2Int(particleSolverIndexA, particleSolverIndexB), 0);

which will result in an out of index access since particleSolverIndexA and B are probably much larger than the amount of particles in that actor.


Either use actor indices, or access the solver's batches (instead of the actor batches).

kind regards,