Unity 3D 如何设置炮塔自动瞄准？ C＃

Question

我不想实现的是让我的炮台旋转并跟随“敌人”。

此刻它检测到了敌人，但它没有旋转，我不知道为什么。

它是我拖入的预制件，必须有更好的方法来做到这一点吗？请问大家有什么建议吗？

目前子弹永远不会触发，但是日志 Shoot and do...并且旋转不起作用。

这就是我所拥有的

using UnityEngine;
using System.Collections;

public class TurretController : MonoBehaviour {

    public Rigidbody bulletPrefab;
    private Transform target;
    private GameObject bullet;
    private float nextFire;
    private Quaternion targetPos;

    void OnTriggerEnter(Collider otherCollider) {
        if (otherCollider.CompareTag("Enemy"))
        {
            Debug.Log ("in");
            target = otherCollider.transform;
            StartCoroutine ("Fire");
        }
    }

    void  OnTriggerExit(Collider otherCollider) {
        if (otherCollider.CompareTag("Enemy"))
        {
            Debug.Log ("out");
            target = null;
            StopCoroutine("Fire"); // aborts the currently running Fire() coroutine
        }
    }

    IEnumerator Fire()
    {
        while (target != null)
        {
            nextFire = Time.time + 0.5f;
            while (Time.time < nextFire)
            {
                // smooth the moving of the turret
                targetPos = Quaternion.LookRotation (target.position);
                transform.rotation = Quaternion.Slerp(transform.rotation, targetPos, Time.deltaTime * 5);
                yield return new WaitForEndOfFrame();
            }
            // fire!
            Debug.Log ("shoot");
            bullet = Instantiate(bulletPrefab, transform.position, transform.rotation) as GameObject;
            //bullet.rigidbody.velocity = transform.forward * bulletSpeed;
        }
    }
}

我试图用这个来改变实例化部分

bullet = (GameObject)Instantiate(bulletPrefab, transform.position, transform.rotation);
            bullet.GetComponent<Bullet>().target = target.transform;

但是我只是收到类似“InvalidCastException：无法从源类型转换为目标类型。 TurretController+c__Iterator0.MoveNext () (at Assets/Scripts/TurretController.cs:44)"

Answer 1

顺便说一句，这是我在项目中使用的炮塔旋转代码（经许可共享）：

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

public class Turret : MonoBehaviour
{
    [SerializeField]
    private float turnRateRadians = 2 * Mathf.PI;

    [SerializeField]
    private Transform turretTop; // the gun part that rotates

    [SerializeField]
    private Transform bulletSpawnPoint;

    private Enemy target;

    void Update()
    {
        TargetEnemy();
    }

    void TargetEnemy()
    {
        if (target == null || target.health <= 0)
            target = Enemy.GetClosestEnemy(turretTop, filter: enemy => enemy.health > 0);

        if (target != null)
        {
            Vector3 targetDir = target.transform.position - transform.position;
            // Rotating in 2D Plane...
            targetDir.y = 0.0f;
            targetDir = targetDir.normalized;

            Vector3 currentDir = turretTop.forward;

            currentDir = Vector3.RotateTowards(currentDir, targetDir, turnRateRadians*Time.deltaTime, 1.0f);

            Quaternion qDir = new Quaternion();
            qDir.SetLookRotation(currentDir, Vector3.up);
            turretTop.rotation = qDir;
        }
    }
}

class Enemy : MonoBehaviour
{
    public float health = 0;

    private static HashSet<Enemy> allEnemies = new HashSet<Enemy>();

    void Awake()
    {
        allEnemies.Add(this);
    }

    void OnDestroy()
    {
        allEnemies.Remove(this);
    }

    /// <summary>
    /// Get the closest enemy to some transform, optionally filtering
    /// (for example, enemies that aren't dead, or enemies of a certain type).
    /// </summary>
    public static Enemy GetClosestEnemy(Transform referenceTransform, System.Predicate<Enemy> filter=null)
    {
        // Left as an exercise for the reader.
        // Remember not to use Vector3.Distance in a loop if you don't need it. ;-)
//      return allEnemies[0];
    }
}

Answer 2

第一个问题：子弹预制件。变量类型为RigidBody。如果要将其视为游戏对象，则该变量必须是游戏对象。或者您可以实例化它，转换为RigidBody，然后使用.gameObject 访问器。像这样：

((RigidBody)Instantiate(theRigidbody)).gameObject

第二个问题：从简单的旋转开始。如果它不起作用，请不要花哨。从这样的事情开始（立即向目标旋转）：

Vector3 targetDirection = target.transform.position - transform.position;
targetDirection.y = 0; // optional: don't look up
transform.forward = targetDirection;

如果它有效，则添加一些额外的复杂性，直到它完全符合您的要求。如果你没有弄明白，请在星期一给我留言（评论）。我写了炮塔瞄准代码（包括最大旋转速度），我想我的老板不会介意我上传它。