unity3d 移動 object 到接觸點

Question

我是初學者程序員。 我找不到有關解決我的問題的信息。 我有一個 3d 游戲。 任務：當您觸摸屏幕時，會創建一個子彈並飛向觸摸。 在我的代碼中，子彈飛上https://imgur.com/fsBaDSe

if (Input.touchCount > 0)
{
    if (Input.GetTouch(0).phase == TouchPhase.Began)
    {
        Vector2 touchPos = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
        Vector2 dir = touchPos - (new Vector2(transform.position.x, transform.position.z));
        dir.Normalize();
        GameObject bullet = Instantiate(projectile, transform.position, Quaternion.identity) as GameObject;
        bullet.GetComponent<Rigidbody2D>().velocity = dir * bulletSpeed;
    }
}

Answer 1

第一：將對撞機添加到您的敵人或您想要射擊的任何東西上。

然后制作一個新游戲 Object 並將其重命名為子彈。

然后制作一個名為Bullet的新 C# 腳本並將其添加到您的子彈游戲 object 中。 然后將子彈游戲 object 轉為預制件。 然后將此代碼放入bullet class 中：

public float speed;
public Rigidbody rb;
Vector3 target;

public void Initialize(Vector3 _target)
{
    target = _target;
    transform.forward = target - transform.position;
}

public void Update()
{
    rb.AddForce(transform.forward * Time.DeltaTime);
}

然后制作一個名為PlayerShoot的新 C# 腳本。 將其添加到您的 PLAYER 游戲 object 並將此代碼粘貼到其中：

public LayerMask shootMask;
public float shootRange;
public Transform player;
public GameObject bulletPrefab;
public Transform shootPos;

public void Update()
{
    foreach(Touch t in Input.touches)
    {
        if(t.phase == TouchPhase.began)
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if(Physics.RayCast(ray, out RaycastHit hit, shootRange, shootMask)
            {
                player.transform.LookAt(new Vector3(hit.point.x, player.position.y, hit.point.z);
            
                Bullet b = Instantiate(bulletPrefab, shootPos.transform.position, shootPos.rotation).GetComponent<Bullet>();

                b.Initialize(hit.point);
            }
        }
    }
}

shootPos是子彈要從哪里射擊，並確保shootPos前進的方向是您想要射擊的方向。

shootRange是玩家可以射擊的距離。 注意：如果它不起作用， shootRange 。

shootMask是你要拍攝的東西。 注意：如果它不起作用，請為您的玩家對撞機添加另一個蒙版，然后在PlayerShoot腳本檢查器中從shootMask列表中取消選中該蒙版。

Answer 2

我會為此使用光線投射來找到子彈“打算”向哪里移動。

這將在有或沒有對撞機的情況下工作，但在有對撞機的目標上射擊會更准確。 請務必將layerMask配置為忽略您的播放器或其他應忽略的對象！

評論中的解釋：

// define what things the ray ignores
// try different configuration in the inspector to see what works for your game
[SerializeField] LayerMask raycastMask;

// define a default distance for ray use if nothing collides
[Serializefield] float defaultRayDist = 20f;

// Where the bullet is meant to be fired from
[SerializeField] Transform bulletOrigin;

//...

    if (Input.GetTouch(0).phase == TouchPhase.Began)
    {
        // Turn touch into ray
        Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);

        Vector3 dest;
        // Determine if raycast hit occurs
        if (Physics.Raycast(ray, out RaycastHit hitInfo, layerMask: raycastMask))
        {
            // If hit occurs use its position
            dest = hitInfo.point;
        } 
        else 
        {
            // If no hit occurs find point along ray to use as bullet destination
            dest = Ray.GetPoint(defaultRayDist);
        }

        // Optionally, put dest at same height as bulletOrigin
        // dest.y = bulletOrigin.position.y;

        // Find direction from start to destination 
        Vector3 dir = (dest - bulletOrigin.position).normalized;

        // Create bullet and set its rotation and velocity
        GameObject bullet = Instantiate(projectile, bulletOrigin.position,
                Quaternion.LookRotation(dir)) as GameObject;

        bullet.GetComponent<Rigidbody2D>().velocity = dir * bulletSpeed;
    }

Answer 3

很簡單。

public Transform target;
public float depth = 4f;
public void Update()
{
    Vector3 touchPoint = Camera.main.ScreenPointToWorld(new Vector3(Input.mousePosition.x, Input.mousePosition.y, depth);

    target.position = touchPoint;
}

Answer 4

一個完整的例子：

void Update()
{
    Vector3 touchPoint = Camera.main.ScreenPointToWorld(new 
    Vector3(Input.mousePosition.x, Input.mousePosition.y, depth);

    float speed = .3f; 
    bullet.transform.position = Vector3.Lerp(bullet.transform.position, 
        touchPoint, 
        speed * Time.deltaTime);

    bullet.transform.forward = touchPoint - bullet.transform.position;
}