c# - 在运行时将游戏对象捕捉到 Unity 3D 中的另一个游戏对象

Question

此时，我将游戏对象拖过屏幕；但是，我很难弄清楚如何让我的游戏对象捕捉到场景中预先存在的游戏对象。一旦实例化，如何在运行时将我的游戏对象捕捉到另一个对象？

public class DragObject : MonoBehaviour

{ 
    private Vector3 mOffset;
    private float mZCoord;

    void OnMouseDown()

    {
        mZCoord = Camera.main.WorldToScreenPoint(
        gameObject.transform.position).z;
        mOffset = gameObject.transform.position - GetMouseAsWorldPoint();
    }

    private Vector3 GetMouseAsWorldPoint()

    {
        Vector3 mousePoint = Input.mousePosition;
        mousePoint.z = mZCoord;
        return Camera.main.ScreenToWorldPoint(mousePoint);
    }

    void OnMouseDrag()

    {
        transform.position = GetMouseAsWorldPoint() + mOffset;
    }

}

LoadAssets 类:

public class LoadAssets : MonoBehaviour
{

    bool isCreated = false;
    bool isCreatedDrillbit = false;

    public void LoadBOP()

    {
        if (!isCreated)

        {
            GameObject instance = Instantiate(Resources.Load("BOP", typeof(GameObject))) as GameObject;
            isCreated = true;
        }

    }

    public void LoadDrillBit()

    {
        if (!isCreatedDrillbit)

        {
            GameObject instance = Instantiate(Resources.Load("Drillbit", typeof(GameObject))) as GameObject;
            isCreatedDrillbit = true;
        }

    }

}

Answer 1

编写一个脚本来检查其他对象的位置，如果它足够接近，则将其作为其自身的子对象，并将其本地位置和旋转设置为默认值。另外，禁用拖动脚本:

public class SnapToMe : MonoBehaviour
{

    public GameObject target = null;
    public float snapDistance = 1f; 

    void FixedUpdate() 
    {
        if (target==null) return;

        if ( Vector3.Distance(transform.position, target.transform.position) <= snapDistance) )  
        {
            target.transform.parent = transform;
            target.transform.localRotation = Quaternion.identity;
            target.transform.localPosition = Vector3.zero;

            target.GetComponent<DragObject>().enabled = false;
        }
    }
}

在要进行捕捉的对象上，在应发生捕捉的位置添加一个子对象，并将捕捉脚本附加到其上:

Bottle
└── Bottle snap point
    └── SnapToMe

然后，当您创建盖子时，告诉捕捉点:

Gameobject newCap = Instantiate(...);
Gameobject bottleSnapPoint = GameObject.Find(
        "Bottle snap point"); // or some other way to get a reference to the snap point

SnapToMe snapper = bottleSnapPoint.GetComponent<SnapToMe>();
snapper.target = newCap;
snapper.snapDistance = 2f; //whatever is appropriate