Unity实现物体运动时画出轨迹

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class LineMark : MonoBehaviour {
 
 
 
 private GameObject clone;  
 private LineRenderer line;  
 private int i;  
 public GameObject obs;  
 public GameObject run;  
 Vector3 RunStart;
 Vector3 RunNext;
 
 // Use this for initialization
 void Start () {
  RunStart = run.transform.position;
  clone = (GameObject)Instantiate(obs, run.transform.position, run.transform.rotation);//克隆一个带有LineRender的物体   
  line = clone.GetComponent<LineRenderer>();//获得该物体上的LineRender组件  
  //  //line.SetColors(Color.blue, Color.red);//设置颜色  
  //  //line.SetWidth(0.2f, 0.1f);//设置宽度  
  i = 0;
 }
 
 // Update is called once per frame  
 void Update () {  
 
  RunNext = run.transform.position;
 
  if (RunStart != RunNext) {
   i++;
   line.SetVertexCount(i);//设置顶点数 
   line.SetPosition(i-1, run.transform.position);
 
  }
 
  RunStart = RunNext;
 
 
 
//  if (Input.GetMouseButtonDown(0))  
//  {  
//   clone = (GameObject)Instantiate(obs, obs.transform.position, transform.rotation);//克隆一个带有LineRender的物体   
//   line = clone.GetComponent<LineRenderer>();//获得该物体上的LineRender组件  
//   line.SetColors(Color.blue, Color.red);//设置颜色  
//   line.SetWidth(0.2f, 0.1f);//设置宽度  
//   i = 0;  
//   print ("GetMouseButtonDown");
//  }  
//  if (Input.GetMouseButton(0))  
//  {  
//   i++;  
//   line.SetVertexCount(i);//设置顶点数  
//   line.SetPosition(i - 1, Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 15)));//设置顶点位置   
//   print ("GetMouseButton");
//
//  }  

 
 }  
}

using UnityEngine;
using System.Collections;
 
public class Run : MonoBehaviour
{
 public GameObject target;   //要到达的目标
 public float speed = 10;    //速度
 private float distanceToTarget;   //两者之间的距离
 private bool move = true;    
 
 void Start()
 {
  //计算两者之间的距离
  distanceToTarget = Vector3.Distance(this.transform.position, target.transform.position);  
  StartCoroutine(StartShoot());
 }
 
 IEnumerator StartShoot()
 {
 
  while (move)
  {
   Vector3 targetPos = target.transform.position;
 
   //让始终它朝着目标
   this.transform.LookAt(targetPos);
 
   //计算弧线中的夹角
   float angle = Mathf.Min(1, Vector3.Distance(this.transform.position, targetPos) / distanceToTarget) * 45;
   this.transform.rotation = this.transform.rotation * Quaternion.Euler(Mathf.Clamp(-angle, -42, 42), 0, 0);
   float currentDist = Vector3.Distance(this.transform.position, target.transform.position);
   if (currentDist < 0.5f)
    move = true;
   this.transform.Translate(Vector3.forward * Mathf.Min(speed * Time.deltaTime, currentDist));
   yield return null;
  }
 }
 
 
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class followme : MonoBehaviour {
 
 Rigidbody follew;
 // Use this for initialization
 void Start () {
  follew = GetComponent<Rigidbody> ();
 }
 
 // Update is called once per frame
 void Update () {
 
  transform.Translate (new Vector3(0.1f,0.1f,0.1f));
 }
}