Unity3d 检测物体在不在摄像机照射范围内

if (Camera!=null&&Camera.transform.hasChanged)
 {
         SetObjectVisibilityDirty();
         Camera.transform.hasChanged = false;
}

转自:http://www.cnblogs.com/AdvancePikachu/p/6733620.html

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

/// <summary>

/// 将脚本挂在摄像机观察的物体上  物体必须带有Render

/// </summary>

public class PlayerView : MonoBehaviour {

    bool isRendering;  

    float curtTime = 0f;

    float lastTime = 0f;

    void OnWillRenderObject()

    {

        curtTime = Time.time;

    }

    public bool IsInView(Vector3 worldPos)

    {

        Transform camTransform = Camera.main.transform;

        Vector2 viewPos = Camera.main.WorldToViewportPoint(worldPos);

        Vector3 dir = (worldPos - camTransform.position).normalized;

        float dot = Vector3.Dot(camTransform.forward, dir);     //判断物体是否在相机前面

        if (dot > 0 && viewPos.x >= 0 && viewPos.x <= 1 && viewPos.y >= 0 && viewPos.y <= 1)

            return true;

        else

            return false;

    }

    void Update()

    {

        Vector2 vec2 = Camera.main.WorldToScreenPoint(this.gameObject.transform.position);

        

        if (IsInView(transform.position))   

        {

            Debug.Log("目前本物体在摄像机范围内");

        }

        else

        {

            Debug.Log("目前本物体不在摄像机范围内");  

        }

    }

}