光线投射到 Unity 中的特定图层 [重复]

Question

我正在使用 GVRTeleport 脚本来允许使用纸板应用进行传送。我希望用于传送的光线投射忽略除一层之外的所有内容。通过this 页面，我相应地修改了脚本（抱歉，找不到此代码所有者的原始链接），但现在传送脚本什么也看不到。有任何想法吗？我的地板层是第 8 层，这是我希望此 raycast 与之交互的层。

using UnityEngine;

public class GVRTeleport : MonoBehaviour {

    public float viewHeight = 7f;

    Vector3 fwd;
    public float maxDistance = 10f;
    public LineRenderer line;
    public GameObject parent;
    public GameObject targetIndicator;

    public StraightLineParam genLine;

    int layerMask = 1 << 8;

    void Start() {
    }


    void Update() {
        RaycastHit hit;
        Ray ray;

        if (Physics.Raycast (transform.position, Vector3.forward, Mathf.Infinity, layerMask)) {
            Debug.Log ("The ray hit the floor");


            if (debugWithMouse) {
                Vector2 mousePos = new Vector2 (Input.mousePosition.x / Screen.width, Input.mousePosition.y / Screen.height);
                ray = Camera.main.ViewportPointToRay (mousePos);
            } else {
                ray = new Ray (transform.position, transform.forward);
            }

            if (Physics.Raycast (ray, out hit)) {
                Debug.DrawLine (transform.position, hit.point, Color.red);  
            }

            if (Input.GetMouseButton (0)) {
                if (Physics.Raycast (ray, out hit)) {

                    if (useViewHeight) {
                        targetIndicator.transform.position = new Vector3 (hit.point.x, hit.point.y + viewHeight, hit.point.z);
                    } else {
                        targetIndicator.transform.position = new Vector3 (hit.point.x, hit.point.y, hit.point.z);
                    }

                    targetIndicator.transform.LookAt (hit.point);
                    targetIndicator.GetComponent<Light> ().intensity = 8;

                    genLine.genLine (new Vector3 (ray.origin.x + 2, ray.origin.y - .5f, ray.origin.z), hit.point);

                    line.material.SetTextureOffset ("_MainTex", new Vector2 (Time.timeSinceLevelLoad * -4f, 0f));
                    line.material.SetTextureScale ("_MainTex", new Vector2 (hit.point.magnitude, 1f));
                }
            }

            if (Input.GetMouseButtonUp (0)) {
                if (Physics.Raycast (ray, out hit)) {
                    if (!debugNoJump) {
                        if (useViewHeight) { //better way?
                            parent.transform.position = new Vector3 (hit.point.x, hit.point.y + viewHeight, hit.point.z);
                        } else {
                            parent.transform.position = new Vector3 (hit.point.x, hit.point.y, hit.point.z);
                        }
                    }
                    if (!debugLine) {
                        line.SetVertexCount (0);
                    }
                }
                targetIndicator.GetComponent<Light> ().intensity = 0;
            }
            Debug.DrawRay (this.transform.position, ray.direction * 5, Color.blue);// .DrawLine(transform.position, hit.point, Color.red);
        }
    }
}

Answer 1

让我们开始吧，您不应该在update() 的每一帧中都投射光线。不知道引擎会如何反应。你应该首先设置一个投射光线的条件，例如当你按下一个键或类似的时候。

然后，尝试使用 1 << 8 代替掩码：

int layer_mask = LayerMask.GetMask("Floor");

//Actually you can add any layer name you want, for example:
//int layer_mask = LayerMask.GetMask("Ground","Enemy","Boxes");

 //do the raycast specifying the mask
 if (Physics.Raycast (ray, out hit, distance, layer_mask))
 {

 } 

以防万一你不小心改变了图层的顺序或者你以后修改它，直接传递名称，从我的角度来看，这样更安全。

如果这不是问题，请检查您使用其变换来投射光线的游戏对象的前向。也许您只是将光线投射到什么都没有的方向，或者至少没有地面。