Help Grab Rope - VR

[josemendez]

Hi Xanduffy,

At first glance the script looks fine, but there's a few things to correct:

Code:

batch.AddConstraint(rope.solverIndices[contact.particle], obiCollider, Vector3.zero, Quaternion.identity, 0, 0, float.PositiveInfinity);

This line will pin the particle to the center of the collider, since you're passing Vector.zero as the pin offset (which is the pin position expressed in the object's local space). This is most likely not what you want in this situation. Instead, you want to pin the particle in its current position. You can do it by transforming the particle position from solver to collider space using Unity's transform methods like this:

Code:

int solverIndex = rope.solverIndices[contact.particle];
Vector3 positionWS = solver.transform.TransformPoint(solver.positions[solverIndex]); // particle position from solver to world space
Vector3 positionCS = obiCollider.transform.InverseTransformPoint(positionWS); // particle position from world to collider space
batch.AddConstraint(rope.solverIndices[contact.particle], obiCollider, positionCS, Quaternion.identity, 0, 0, float.PositiveInfinity);

Also, make sure pin constraints are globally enabled in the solver's constraints foldout. They won't have any effect otherwise.

Let me know how it goes,

cheers!