/// <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(ObiCurve),
typeof(ObiRopeCursor));
// get references to all components:
rope = ropeObject.GetComponent <ObiRope>();
cursor = ropeObject.GetComponent <ObiRopeCursor>();
solver = ropeObject.GetComponent <ObiSolver>();
ObiCurve path = ropeObject.GetComponent <ObiCurve>();
// 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(new ObiCurve.ControlPoint(Vector3.zero, Vector3.up));
path.controlPoints.Add(new ObiCurve.ControlPoint(Vector3.zero, Vector3.up));
path.controlPoints.Add(new ObiCurve.ControlPoint(Vector3.down * ropeLength, Vector3.up));
path.controlPoints.Add(new ObiCurve.ControlPoint(Vector3.down * ropeLength, Vector3.up));
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.Solver.invMasses[rope.particleIndices[0]] = rope.invMasses[0] = 0;
}
void Awake()
{
ObiCurve path = GetComponent <ObiCurve>();
path.controlPoints.Clear();
float ang = 0;
float height = 0;
for (int i = 0; i < points; ++i)
{
Vector3 point = new Vector3(Mathf.Cos(ang) * radius, height, Mathf.Sin(ang) * radius);
// optimal handle length for circle approximation: 4/3 tan(pi/(2n))
Vector3 tangent = new Vector3(-point.z, heightStep, point.x).normalized *(4.0f / 3.0f) * Mathf.Tan(radialStep / 4.0f) * radius;
path.controlPoints.Add(new ObiCurve.ControlPoint(point, Vector3.up, -tangent, tangent, ObiCurve.ControlPoint.BezierCPMode.Mirrored));
ang += radialStep;
height += heightStep;
}
}
void Awake()
{
// Create both the rope and the solver:
rope = gameObject.AddComponent <ObiRope>();
renderer = gameObject.AddComponent <ObiRopeExtrudedRenderer>();
curve = gameObject.AddComponent <ObiCurve>();
solver = gameObject.AddComponent <ObiSolver>();
// Provide a solver and a curve:
rope.Solver = solver;
rope.ropePath = curve;
rope.GetComponent <MeshRenderer>().material = material;
// Configure rope and solver parameters:
rope.resolution = 0.1f;
rope.BendingConstraints.stiffness = 0.2f;
renderer.section = section;
renderer.uvScale = new Vector2(1, 5);
renderer.normalizeV = false;
renderer.uvAnchor = 1;
solver.substeps = 3;
solver.distanceConstraintParameters.iterations = 5;
solver.pinConstraintParameters.iterations = 5;
solver.bendingConstraintParameters.iterations = 1;
solver.particleCollisionConstraintParameters.enabled = false;
solver.volumeConstraintParameters.enabled = false;
solver.densityConstraintParameters.enabled = false;
solver.stitchConstraintParameters.enabled = false;
solver.skinConstraintParameters.enabled = false;
solver.tetherConstraintParameters.enabled = false;
// Add a cursor to be able to change rope length:
cursor = rope.gameObject.AddComponent <ObiRopeCursor>();
cursor.normalizedCoord = 0;
cursor.direction = true;
}
