Help how can i creat a chain at run time

[huahuapro]

Can you post your whole script?

Code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Obi;


public class GrapplingHook : MonoBehaviour
{

    public ObiSolver solver;
    public ObiCollider character;
    public float hookExtendRetractSpeed = 2;
   
    public ObiRopeSection section;

    public GameObject chain;
   
    private List<GameObject> PrefabsList;

    public ObiRope rope;
    private ObiRopeBlueprint blueprint;
    private ObiRopeExtrudedRenderer ropeRenderer;
    private ObiRopeChainRenderer chainRenderer;

    private ObiRopeCursor cursor;

    //private Camera cam;

    public RaycastHit hookAttachment;
   

    KeyCode interKey = KeyCode.Joystick1Button0;
    KeyCode addRope = KeyCode.Joystick1Button4;
    KeyCode lessRope = KeyCode.Joystick1Button5;

    public SpeedTutorInspectSystem.InspectionRaycast playerIns;
    private bool attached = false;

    private GameObject maincam;
    private bool doOnce;
    private SpeedTutorInspectSystem.ObjectController raycastedObj;

    [SerializeField] private int rayLength = 15;
   

    public RaycastHit hit;

    void Awake()
    {
       
        //找到玩家身上的主攝像機
        GameObject camobject = GameObject.FindGameObjectWithTag("MainCamera");
        maincam = camobject;

        //這裡學到一個超牛的，之前我沒有給chain初始化，public GameObject chain並沒有定義，下面必須初始化，否則後面的一切，update都不會觸發！
        //chain = new GameObject();
        PrefabsList = new List<GameObject>();
        PrefabsList.Add((GameObject)Instantiate(chain, Vector3.zero, Quaternion.identity));
        PrefabsList.Add((GameObject)Instantiate(chain, Vector3.zero, Quaternion.identity));
       

        // Create both the rope and the solver:    
        rope = gameObject.AddComponent<ObiRope>();
        chainRenderer = gameObject.AddComponent<ObiRopeChainRenderer>();
       
        chainRenderer.linkPrefabs = PrefabsList;
        chainRenderer.linkScale = new Vector3(34,34,34);
        chainRenderer.twistAnchor = 0;
        chainRenderer.sectionTwist = 70;
       

        // Setup a blueprint for the rope:
        blueprint = ScriptableObject.CreateInstance<ObiRopeBlueprint>();
   
        blueprint.resolution = 0.5f;

        // Tweak rope parameters:
        rope.maxBending = 0.02f;

        // Add a cursor to be able to change rope length:
        cursor = rope.gameObject.AddComponent<ObiRopeCursor>();
        cursor.cursorMu = 0;
        cursor.direction = true;
    }

    private void OnDestroy()
    {
        DestroyImmediate(blueprint);
    }


    public void LaunchHook()
    {

        //這裡一定是要從攝影機發射出來的ray才行，弄了半天才找到答案！
        //下面還有debugray的一種方法就是畫debug的線

        Ray ray = new Ray(transform.position, maincam.transform.forward);

        if (Physics.Raycast(ray, out hookAttachment))
            {
                //Debug.DrawLine(ray.origin, hookAttachment.point, Color.red);
               
                StartCoroutine(AttachHook());
            }

        else
        {
            Debug.DrawLine(ray.origin, ray.origin + ray.direction*100, Color.green);

        }

    }


    private IEnumerator AttachHook()
    {
        yield return 0;
        Vector3 localHit = rope.transform.InverseTransformPoint(hookAttachment.point);

        // 將rope由兩點畫出來:
        blueprint.path.Clear();
        blueprint.path.AddControlPoint(Vector3.zero, -localHit.normalized, localHit.normalized, Vector3.up, 0.1f, 0.1f, 1, 1, Color.white, "Hook start");
        blueprint.path.AddControlPoint(localHit, -localHit.normalized, localHit.normalized, Vector3.up, 0.1f, 0.1f, 1, 1, Color.white, "Hook end");
        blueprint.path.FlushEvents();

        // 畫出rope的blueprint:
        yield return blueprint.Generate();

        // 設置兩點的交互，rope對物體的影響在這裡設置:
        var pinConstraints = blueprint.GetConstraintsByType(Oni.ConstraintType.Pin) as ObiConstraints<ObiPinConstraintsBatch>;
        var batch = pinConstraints.batches[0];
        batch.AddConstraint(0, character, transform.localPosition, Quaternion.identity);
        batch.AddConstraint(blueprint.activeParticleCount - 1, hookAttachment.collider.GetComponent<ObiColliderBase>(),
                                                          hookAttachment.collider.transform.InverseTransformPoint(hookAttachment.point), Quaternion.identity);
                                                         
        batch.stiffnesses[0 * 2 + 1] = 100000000;
        batch.stiffnesses[1 * 2 + 1] = 100000000;
        batch.activeConstraintCount = 2;
        //batch.stiffnesses[constraintIndex * 2 + 1] = 10000;
       
       
       
       
        // 最終顯示出來.
        rope.ropeBlueprint = blueprint;
       
        rope.GetComponent<ObiRopeChainRenderer>().enabled = true;
       
    }

    public void DetachHook()
    {
        // Set the rope blueprint to null (automatically removes the previous blueprint from the solver, if any).
        rope.ropeBlueprint = null;
        rope.GetComponent<ObiRopeChainRenderer>().enabled = false;
    }


    void Update()
    {
       
        //如果用getkey的話就會一秒內按無數次，必須是Getkeydown才可以！gfg
        if (Input.GetKeyDown(interKey))
        {
           
            if (!rope.isLoaded)
            {
                LaunchHook();
            }
               
            else
                DetachHook();
        }

        if (rope.isLoaded)
        {
            if (Input.GetKey(lessRope))
            {
                cursor.ChangeLength(rope.restLength - hookExtendRetractSpeed * Time.deltaTime);
            }
            if (Input.GetKey(addRope))
            {
                cursor.ChangeLength(rope.restLength + hookExtendRetractSpeed * Time.deltaTime);
            }
        }
    }
}