unity射线

曾经终败给现在 2022-04-08 11:27 213阅读 0赞

1.摄像机位置投放射线,鼠标点到哪移动到哪

using UnityEngine;
    using System.Collections;
    
    public class RayTest : MonoBehaviour
    {
        private Ray ray;
        private RaycastHit hit;//射线碰到的碰撞信息
        private NavMeshAgent agent;
        private void Start() {
            agent = this.GetComponent<NavMeshAgent>();
        }
        void Update(){
            //起始位置(主摄像机)
            //方向（鼠标位置）
            ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit, 100)&&
                Input.GetMouseButtonDown(0)){
                agent.SetDestination(hit.point);
                //ray.origin射线起始点
                // hit.point射线碰到碰撞器的接触点
                Debug.DrawLine(ray.origin, hit.point, Color.red);
            }
        }
        //鼠标点哪物体移动到哪，射线跟寻路配合
    }

2.鼠标仅点击小地图才会移动到目标点

using UnityEngine;
    using System.Collections;
    
    /// <summary>
    /// 小地图射线使用
    /// </summary>
    public class MapNav : MonoBehaviour
    {
        private RaycastHit hit;
        private Ray ray;
        public Camera mapCamera;//小地图摄像机
        private NavMeshAgent agent;
        private void Start()
        {
            agent = this.GetComponent<NavMeshAgent>();
        }
        private void Update()
        {
            ray = mapCamera.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit, 100) &&
                Input.GetMouseButtonDown(0))
            {
                if(hit.transform.tag == "House")
                agent.SetDestination(hit.transform.position);
            }
        }
     
    }

3.摄像机投放射线实现准心效果

using UnityEngine;
    using System.Collections;
    
    /// <summary>
    /// 摄像机位置投放射线 准心效果
    /// </summary>
    public class RayUI : MonoBehaviour
    {
        public RectTransform UI;
        private RaycastHit hit;
        private Ray ray;
        public LayerMask layer;//遮罩层
        private void Update()
        {
           ray = Camera.main.ScreenPointToRay(Input.mousePosition);
           //if (Physics.Raycast(ray, out hit, 50))
           if (Physics.Raycast(ray, out hit, 50, layer.value))
           {
              // if (hit.transform.tag == "target")
              // {
                   UI.gameObject.SetActive(true);
                   UI.position = Input.mousePosition;
               //}
               //else
                //   UI.gameObject.SetActive(false);
           }
            else
               UI.gameObject.SetActive(false);
        }
     
    }

4.枪口位置投放射线实现准心效果

using UnityEngine;
    using System.Collections;
    
    /// <summary>
    /// 枪口位置投放射线 准心效果
    /// </summary>
    public class GunUI : MonoBehaviour
    {
        private RaycastHit hit;
        public LayerMask layer;
        public Transform gunPos;//枪口位置
        public RectTransform UI;//准心
        private void Update()
        {
            if (Physics.Raycast(gunPos.position,
                gunPos.forward, out hit, 10, layer.value))
            {
                //世界坐标转屏幕坐标
                Vector3 gunUI = Camera.main.WorldToScreenPoint(hit.point);
                UI.gameObject.SetActive(true);
                UI.position = gunUI;
                Debug.DrawLine(gunPos.position, hit.point, Color.red);
            }
            else
                UI.gameObject.SetActive(false);
        }
     
    }

5.线渲染:添加Effect/linerender

using UnityEngine;
    using System.Collections;
    
    /// <summary>
    /// 枪口位置投放射线 准心效果
    /// </summary>
    public class GunUI : MonoBehaviour
    {
        private RaycastHit hit;
        public LayerMask layer;
        public Transform gunPos;//枪口位置
        public RectTransform UI;//准心
        private LineRenderer line;
        private void Start()
        {
            line = this.GetComponent<LineRenderer>();
        }
        private void Update()
        {
            if (Physics.Raycast(gunPos.position,
                gunPos.forward, out hit, 10, layer.value))   //起始位置,方向,距离,层   (不写距离为无限远,若不写距离但是写了layer.value则layer.value的值会被当成距离)
            {
                //世界坐标转屏幕坐标
                Vector3 gunUI = Camera.main.WorldToScreenPoint(hit.point);
                UI.gameObject.SetActive(true);
                UI.position = gunUI;
                //线渲染
                line.enabled = true;
                //设置线位置
                line.SetPosition(0, gunPos.position);
                line.SetPosition(1, hit.point);
    
                Debug.DrawLine(gunPos.position, hit.point, Color.red);
            }
            else
            {
                line.enabled = false;
                UI.gameObject.SetActive(false);
            }   
        }
    }

6.射线拾取物体

using UnityEngine;
    using System.Collections;
    
    /// <summary>
    /// 射线拾取物体
    /// </summary>
    public class RayCarry : MonoBehaviour
    {
        private Ray ray;
        private RaycastHit hit;
        public LayerMask layer;
        public Transform carryParent;//拾取到物体的父物体
        private Transform carryObj;//拾取到的物体
        private bool flag = false;
        private void Update()
        {
            ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (!flag)
            {
                if (Physics.Raycast(ray, out hit, 10, layer.value)
                    && Input.GetMouseButtonDown(0))
                {
                    flag = true;
                    carryObj = hit.transform;
                    carryObj.parent = carryParent;
                    carryObj.localPosition = Vector3.zero;
                    carryObj.localEulerAngles = Vector3.zero;
                }
            }
            else
            {
                if (Input.GetMouseButtonDown(0))
                {
                    flag = false;
                    //取消父子关系
                    carryObj.parent = null;
                    carryObj.eulerAngles = new Vector3(0, carryObj.eulerAngles.y, 0);
                }
            }
    
        }
     
    }

7.其他种类射线

using UnityEngine;
    using System.Collections;
    
    /// <summary>
    /// 球形射线和射线列表
    /// </summary>
    public class RayOther : MonoBehaviour
    {
        //private RaycastHit[] hits;
        private Collider[] hits;
        public LayerMask layer;
        private void Update()
        {
        
            //球形射线
            if (Input.GetKeyDown(KeyCode.Space))
            {
                hits = Physics.OverlapSphere(transform.position, 3, layer.value);
                for (int i = 0; i < hits.Length; i++)
                {
                    hits[i].transform.GetComponent<Renderer>().material.color = Color.red;
                    hits[i].GetComponent<EnemyHp>().enemyHP -= 5;
                    Debug.DrawLine(transform.position, hits[i].transform.position, Color.blue);
                }
            }
    
            //射线投射列表:返回所有碰撞不会被第一个碰撞层遮挡,返回顺序不固定
    
            hits = Physics.RaycastAll(transform.position, transform.right, 5);
            for (int i = 0; i < hits.Length; i++)
            {
                hits[i].transform.GetComponent<Renderer>().material.color = Color.red;
                Debug.DrawLine(transform.position, hits[i].point, Color.blue);
            }
          if (Physics.Raycast(transform.position,transform.right, out hit, 5))
          {
              Debug.DrawLine(transform.position, hit.point, Color.red);
          }
        } 
    }