/// <summary>
/// Creates a straight rope anchored to a transform at the top.
/// Transform may or may not move around and may or may not have a rigidbody.
/// When you call this the rope will appear in the scene and immediately interact with gravity and objects with ObiColliders.
/// Called from anywhere (main thread only)
/// </summary>
public IEnumerator MakeRope(Transform anchoredTo, Vector3 attachmentOffset, float ropeLength)
{
// create a new GameObject with the required components: a solver, a rope, and a curve.
// we also throw a cursor in to be able to change its length.
GameObject ropeObject = new GameObject("rope", typeof(ObiSolver),
typeof(ObiRope),
typeof(ObiCatmullRomCurve),
typeof(ObiRopeCursor));
// get references to all components:
rope = ropeObject.GetComponent <ObiRope>();
cursor = ropeObject.GetComponent <ObiRopeCursor>();
solver = ropeObject.GetComponent <ObiSolver>();
ObiCatmullRomCurve path = ropeObject.GetComponent <ObiCatmullRomCurve>();
// set up component references (see ObiRopeHelper.cs)
rope.Solver = solver;
rope.ropePath = path;
rope.section = Resources.Load <ObiRopeSection>("DefaultRopeSection");
// set path control points (duplicate end points, to set curvature as required by CatmullRom splines):
path.controlPoints.Clear();
path.controlPoints.Add(Vector3.zero);
path.controlPoints.Add(Vector3.zero);
path.controlPoints.Add(Vector3.down * ropeLength);
path.controlPoints.Add(Vector3.down * ropeLength);
rope.pooledParticles = 2000;
// parent the rope to the anchor transform:
rope.transform.SetParent(anchoredTo, false);
rope.transform.localPosition = attachmentOffset;
// generate particles/constraints and add them to the solver (see ObiRopeHelper.cs)
yield return(rope.StartCoroutine(rope.GeneratePhysicRepresentationForMesh()));
rope.AddToSolver(null);
// get the last particle in the rope at its rest state.
pinnedParticle = rope.UsedParticles - 1;
// add a tethers batch:
ObiTetherConstraintBatch tetherBatch = new ObiTetherConstraintBatch(true, false, 0, 1);
rope.TetherConstraints.AddBatch(tetherBatch);
//UpdateTethers();
// fix first particle in place (see http://obi.virtualmethodstudio.com/tutorials/scriptingparticles.html)
rope.invMasses[0] = 0;
Oni.SetParticleInverseMasses(solver.OniSolver, new float[] { 0 }, 1, rope.particleIndices[0]);
}
private void UpdateTethers()
{
rope.TetherConstraints.RemoveFromSolver(null);
ObiTetherConstraintBatch batch = (ObiTetherConstraintBatch)rope.TetherConstraints.GetFirstBatch();
batch.Clear();
ObiDistanceConstraintBatch dbatch = rope.DistanceConstraints.GetFirstBatch();
for (int i = 0; i < dbatch.ConstraintCount; ++i)
{
batch.AddConstraint(0, dbatch.springIndices[i * 2 + 1], rope.InterparticleDistance * i, 1, 1);
}
batch.Cook();
rope.TetherConstraints.AddToSolver(null);
}