当我想将实例化的游戏对象分配给类

Question

我的代码如下

using UnityEngine;
using System.Collections;
using UnityStandardAssets.Utility;

public class CentipedeBoss : MonoBehaviour {

    [System.Serializable]
    public class Path
    {
        public BezierSpline spline;
        public float duration;
    }
    public Path []path;

    [System.Serializable]
    public class SineWave
    {
    public float amplitude = 10.0f;

    public float frequency = 1.0f;

    }
    public SineWave sineWave = new SineWave();

    public float[] timers;
    public float timer;

    #region body parts
    public GameObject head;

    [System.Serializable]
    public class Body
    {
        public GameObject []parts;
        public float distance;
        public float height;
        public float rotationDamping;
        public float heightDamping;
    }
    public Body body = new Body();
    #endregion


    SplineWalker currPathSpline;
    int currPathIndex = 0;
    public float duration;

    void Start()
    {
        currPathSpline = head.GetComponent<SplineWalker>();

        InitBodyParts();
        InitTimer ();
    }

    void Update()
    {


        Movement (criticalPoints[0].bodyPart.transform);

        duration -= Time.deltaTime;

        if(duration <= 0)
        {
            ChangePath();
        }
    }

    void InitTimer()
    {
        timers = new float[body.parts.Length];
        for (int i = 0; i < timers.Length; i++)
            timers [i] = timer;
    }

    [System.Serializable]
    public class CriticalPoint
    {
        public GameObject bodyPart;
        public bool state;

        public CriticalPoint()
        {
            InitCriticalPoint();
        }

        private void InitCriticalPoint()
        {
            bodyPart = new GameObject();
            state = true;
        }
    }
    public CriticalPoint[] criticalPoints;

    void InitBodyParts()
    {
        criticalPoints = new CriticalPoint[body.parts.Length];
        Debug.Log ("size critpoints : " + criticalPoints.Length);
        for(int i = 0; i < body.parts.Length; i++)
        {
            **criticalPoints[i].bodyPart = (GameObject) Instantiate(body.parts[i], Vector3.zero, new Quaternion(0,0,0,0));** 
            //bodyPart[i].transform.parent = transform;
            criticalPoints[i].bodyPart.name = i + "";
            criticalPoints[i].bodyPart.AddComponent<SmoothFollow>();

            criticalPoints[i].bodyPart.GetComponent<SmoothFollow>().distance = body.distance;
            criticalPoints[i].bodyPart.GetComponent<SmoothFollow>().height = body.height;
            criticalPoints[i].bodyPart.GetComponent<SmoothFollow>().rotationDamping = body.rotationDamping;
            criticalPoints[i].bodyPart.GetComponent<SmoothFollow>().heightDamping = body.heightDamping;

            if(i == 0)
            {
                criticalPoints[i].bodyPart.GetComponent<SmoothFollow>().target = transform;
            }

            else
            {
                criticalPoints[i].bodyPart.GetComponent<SmoothFollow>().target = criticalPoints[i - 1].bodyPart.transform;
            }
            criticalPoints[i].state = true;
        }

    }

    void ChangePath()
    {
        int rand = 0;

        do
        {
            rand = UnityEngine.Random.Range(0, path.Length);
        }
        while(rand == currPathIndex);

        currPathIndex = rand;
        currPathSpline.spline = path[currPathIndex].spline;

        duration = path[currPathIndex].duration;
        currPathSpline.duration = duration;
    }

    void Movement(Transform body)
    {

        body.position += sineWave.amplitude*(Mathf.Sin(2*Mathf.PI*sineWave.frequency*Time.time) - Mathf.Sin(2*Mathf.PI*sineWave.frequency*(Time.time - Time.deltaTime)))*body.up;
        //Debug.Log (body.position + " " + body.name);
    }

    public int CheckState()
    {
        bool alive = false;
        int count = 0;
        for (int i = 0; i < criticalPoints.Length; i++) 
        {
            if (criticalPoints[i].state)
                alive = true;
            else
                count++;
        }

        if (alive == false) 
        {
            Destroy (gameObject);
        }
        return count;
    }
}

  

Unity返回：NullReferenceException：未将对象引用设置为对象的实例   CentipedeBoss.InitBodyParts（）（在Assets / Scripts / Centipede / CentipedeBoss.cs：136）   CentipedeBoss.Start（）（在Assets / Scripts / Centipede / CentipedeBoss.cs：53）

不起作用的行是：criticalPoints[i].bodyPart = (GameObject) Instantiate(body.parts[i], Vector3.zero, new Quaternion(0,0,0,0));

该行位于InitBodyPart()函数中。