using UnityEngine;
using System.Collections;
//转载请说明出处public class PreFrameRaycast : MonoBehaviour
{private RaycastHit hitInfo;private Transform tr;// Use this for initializationvoid Start(){}void Awake(){tr = this.transform;}// Update is called once per framevoid Update(){hitInfo = new RaycastHit();Physics.Raycast(tr.position, tr.forward, out hitInfo);Debug.DrawRay(tr.position, tr.forward, Color.red);}//返回射线的碰撞信息public RaycastHit GetHitInfo(){if (hitInfo.Equals(null)){Debug.LogWarning("hitInfo is null");}return hitInfo;}
}

using UnityEngine;
using System.Collections;
//转载请说明出处
public class pointerCtrl : MonoBehaviour
{public float scrollSpeed = 0.5f;public float pulseSpeed = 1.5f;public float noiseSize = 1.0f;public float maxWidth = 0.5f;public float minWidth = 0.5f;private float aniTime = 0.0f;private float aniDir = 1.0f;private LineRenderer lRenderer;public GameObject pointer = null;  //小红点private PreFrameRaycast raycast;   //光线投射void Start(){lRenderer = gameObject.GetComponent (typeof(LineRenderer)) as LineRenderer;raycast = gameObject.GetComponent(typeof(PreFrameRaycast)) as PreFrameRaycast;// Update is called once per frame
    }void Update(){//光线看起来有动感GetComponent<Renderer>().material.mainTextureOffset += new Vector2(Time.deltaTime * aniDir * scrollSpeed, 0);//设置纹理偏移量GetComponent<Renderer>().material.SetTextureOffset("_NoiseTex", new Vector2(-Time.time * aniDir * scrollSpeed, 0.0f));float aniFactor = Mathf.PingPong(Time.time * pulseSpeed, 1.0f);aniFactor = Mathf.Max(minWidth, aniFactor) * maxWidth;//设置光线的宽
        lRenderer.SetWidth(aniFactor, aniFactor);//光线的起点，枪口的地方lRenderer.SetPosition(0, this.gameObject.transform.position);if (raycast == null){Debug.Log("raycast is null");return;}//获取光线的碰撞信息RaycastHit hitInfo = raycast.GetHitInfo();//光线碰撞到物体if (hitInfo.transform){//光线的终点，即光线的碰撞点lRenderer.SetPosition(1, hitInfo.point);GetComponent<Renderer>().material.mainTextureScale = new Vector2(0.1f * (hitInfo.distance), GetComponent<Renderer>().material.mainTextureScale.y);GetComponent<Renderer>().material.SetTextureScale("_NoiseTex", new Vector2(0.1f * hitInfo.distance * noiseSize, noiseSize));if (pointer){pointer.GetComponent<Renderer>().enabled = true;//pointer.transform.position = hitInfo.point + (transform.position - hitInfo.point) * 0.01f;pointer.transform.position = hitInfo.point;pointer.transform.rotation = Quaternion.LookRotation(hitInfo.normal, transform.up);pointer.transform.eulerAngles = new Vector3(90, pointer.transform.eulerAngles.y, pointer.transform.eulerAngles.z);}}else{    //光线没有碰撞到物体if (pointer){pointer.GetComponent<Renderer>().enabled = false;}//光线的最大长度float maxDist = 200.0f;//当光线没有碰撞到物体，终点就是枪口前方最大距离处lRenderer.SetPosition(1, (this.transform.forward * maxDist));GetComponent<Renderer>().material.mainTextureScale = new Vector2(0.1f * maxDist, GetComponent<Renderer>().material.mainTextureScale.y);GetComponent<Renderer>().material.SetTextureScale("_NoiseTex", new Vector2(0.1f * maxDist * noiseSize, noiseSize));}}
}