Question

我可以通过RayCast 放置一个对象，但它将对象放在彼此内。 我希望它能够检测到碰撞，以便如果某个对象位于该对象之下，那么它必须将新对象放在其上。或者如果在左边碰撞，它必须在右边放置对象。

这是我的代码

using UnityEngine;
using System.Collections;

public class targetPosition : MonoBehaviour {

    public GameObject obj;
    Vector3 newPosition;
    void Start () {
        newPosition = transform.position;
    }
    void Update()
    {
        if (Input.GetMouseButtonDown(0)) //It places cube on left click
        {
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit))
            {
                newPosition = hit.point;
                GameObject obj1 = Instantiate(obj,newPosition, Quaternion.identity) as GameObject;
                obj1.SetActive (true);

            }
        }
        if (Input.GetMouseButtonDown (1)) //deletes cube on right click
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                Destroy(hit.collider.gameObject);
            }
        }

    }
}

感谢。

Answer 1

使用此代码，您可以检测光线射击的物体的哪一侧。从那时起，您需要使用该点的某个偏移量来实例化您的对象。

Vector3 normalOfHit;
     void Update()
        {
            if (Input.GetMouseButtonDown(0)) //It places cube on left click
            {
                RaycastHit hit;
                Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                if (Physics.Raycast(ray, out hit))
                {
                    normalOfHit = hit.normal;
                    normalOfHit = hit.transform.TransformDirection(normalOfHit);

                    if(normalOfHit == hit.transform.up)
                    {
                        Debug.Log("Hit top side");
                    }
                    if (normalOfHit ==  -hit.transform.up)
                    {
                        Debug.Log("Hit bottom side");
                    }
                    if (normalOfHit == hit.transform.right)
                    {
                        Debug.Log("Hit right side");
                    }
                    if (normalOfHit == -hit.transform.right)
                    {
                        Debug.Log("Hit left side");
                    }
                    if(normalOfHit == hit.transform.forward)
                    {
                        Debug.Log("Hit front side");
                    }
                    if(normalOfHit == -hit.transform.forward)
                    {
                        Debug.Log("Hit back of object");
                    }
                }
            }
    }

如何将对象置于另一个对象的顶部？

1 个答案: