c# - Boid 蜂拥而至正确跟随目标？

Question

我正在尝试转换此处找到的 boid 植绒脚本： http ://wiki.unity3d.com/index.php?title=Flocking

要在我的 2D 游戏中工作，它可以工作，但羊群根本不跟随目标。羊群似乎只想以大约 20 度的角度向右和向上移动。我如何让羊群在这个脚本中追逐目标或“Chasee”？

为简单起见，我将大部分坐标保留为 Vector3，并在调整速度时将它们转换为 Vector 2。

using UnityEngine;
using System.Collections;

public class BoidController : MonoBehaviour
{
    public float minVelocity = 5;
    public float maxVelocity = 20;
    public float randomness = 1;
    public int flockSize = 20;
    public GameObject prefab;
    public GameObject chasee;

    public Vector3 flockCenter;
    public Vector3 flockVelocity;

    private GameObject[] boids;

    void Start()
    {
        boids = new GameObject[flockSize];
        for (var i=0; i<flockSize; i++)
        {
            Vector3 position = new Vector3 (
                Random.value *  GetComponent<BoxCollider2D>().bounds.size.x,
                Random.value *  GetComponent<BoxCollider2D>().bounds.size.y
                ) -  GetComponent<BoxCollider2D>().bounds.extents;

            GameObject boid = Instantiate(prefab, transform.position, transform.rotation) as GameObject;
            boid.transform.parent = transform;
            boid.transform.localPosition = position;
            boid.GetComponent<BoidFlocking>().SetController (gameObject);
            boids[i] = boid;
        }
    }

    void Update ()
    {
        Vector3 theCenter = Vector3.zero;
        Vector3 theVelocity = Vector3.zero;

        foreach (GameObject boid in boids)
        {
            theCenter = theCenter + boid.transform.localPosition;
            theVelocity = theVelocity + (Vector3) boid.GetComponent<Rigidbody2D>().velocity;
        }

        flockCenter = theCenter/(flockSize);
        flockVelocity = theVelocity/(flockSize);
    }
}

然后是植绒行为

using UnityEngine;
using UnityEngine;
using System.Collections;

public class BoidFlocking : MonoBehaviour
{
    private GameObject Controller;
    private bool inited = false;
    private float minVelocity;
    private float maxVelocity;
    private float randomness;
    private GameObject chasee;

    void Start ()
    {
        StartCoroutine ("BoidSteering");
    }

    IEnumerator BoidSteering()
    {
        while (true)
        {
            if (inited)
            {
                GetComponent<Rigidbody2D>().velocity = GetComponent<Rigidbody2D>().velocity + (Vector2) Calc () * Time.deltaTime;

                // enforce minimum and maximum speeds for the boids
                float speed = GetComponent<Rigidbody2D>().velocity.magnitude;
                if (speed > maxVelocity)
                {
                    GetComponent<Rigidbody2D>().velocity = GetComponent<Rigidbody2D>().velocity.normalized * maxVelocity;
                }
                else if (speed < minVelocity)
                {
                    GetComponent<Rigidbody2D>().velocity = GetComponent<Rigidbody2D>().velocity.normalized * minVelocity;
                }
            }

            float waitTime = Random.Range(0.3f, 0.5f);
            yield return new WaitForSeconds (waitTime);
        }
    }

    private Vector3 Calc()
    {
        Vector3 randomize = new Vector3 ((Random.value *2) -1, (Random.value * 2) -1, (Random.value * 2) -1);

        randomize.Normalize();
        BoidController boidController = Controller.GetComponent<BoidController>();
        Vector3 flockCenter = boidController.flockCenter;
        Vector3 flockVelocity = boidController.flockVelocity;
        Vector3 follow = chasee.transform.localPosition;

        flockCenter = flockCenter - transform.localPosition;
        flockVelocity = flockVelocity - (Vector3) GetComponent<Rigidbody2D>().velocity;
        follow = follow - transform.localPosition;

        return (flockCenter + flockVelocity + follow * 2 + randomize * randomness);
    }

    public void SetController (GameObject theController)
    {
        Controller = theController;
        BoidController boidController = Controller.GetComponent<BoidController>();
        minVelocity = boidController.minVelocity;
        maxVelocity = boidController.maxVelocity;
        randomness = boidController.randomness;
        chasee = boidController.chasee;
        inited = true;
    }
}

Answer 1

在计算跟随方向时，我在追逐和 boid 上使用本地位置，它们是不同对象的子对象。本来应该

Vector3 follow = chasee.transform.position;
follow = follow - transform.position;