Unity - Phyics.Raycast returns 错误

Question

我创建了一个空的游戏对象并附加了 .cs 文件。我尝试在鼠标单击位置加载预制件（.obj 文件）。我的代码是：

    Ray ray;
    RaycastHit hit;
    public GameObject prefab;

    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {

        if (Input.GetMouseButtonDown(0))
        {
            ray=Camera.main.ScreenPointToRay(Input.mousePosition);

            if (Physics.Raycast(ray, out hit))
            {
                GameObject obj = Instantiate(prefab, new Vector3(hit.point.x, hit.point.y, hit.point.z), Quaternion.identity) as GameObject;

            }
            else
            {
                Debug.Log("Physics.Raycast returns false");
            }
    }

Raycast returns 每次都是错误的。

Answer 1

您需要将 Collider 添加到您的 GameObject

对于 Physics3D

Description

Casts a ray against all colliders in the scene.

Physics.Raycast 脚本 API 文档 here.

对于 Physics2D

Description

Casts a ray against colliders in the scene.

A raycast is conceptually like a laser beam that is fired from a point in space along a particular direction. Any object making contact with the beam can be detected and reported.

Physics2D.Raycast 脚本 API 文档 here.

Answer 2

您需要将 3d 对撞机附加到您的 sprite 游戏对象才能被光线投射检测到。

See my complete answer here

Unity - Phyics.Raycast returns 错误

Unity - Phyics.Raycast returns false

c#

instantiation

unity3d

raycasting