注意：用Debug画的线会存在穿透问题
没啥好解释的，直接看代码：
using UnityEngine;
using System.Collections;
using System.Collections.Generic; /*
* 找不到设置线宽的方法，目前的解决方法就是用画矩形代替画线来实现线的粗细
*/ /// <summary>
/// 必须将此脚本放在摄影机上才能看到绘画内容,DebugDraw可以不用，但DebugDraw画的内容
/// 只能在编辑模式下看得到。
/// </summary>
[RequireComponent(typeof(Camera))]
public class DrawTrack: MonoBehaviour
{
/// <summary>
/// 画笔的材质
/// </summary>
public Material Material; /// <summary>
/// 绘画该目标的移动路径
/// </summary>
public Transform Target; /// <summary>
/// 画笔平滑度
/// </summary>
public float Smooth = ; /// <summary>
/// 是否也在编辑器里绘画出线
/// </summary>
public bool DebugDraw = true; /// <summary>
/// 存放移动路径的点的集合
/// </summary>
private List<Vector3> path; /// <summary>
/// 目标的最后一个移动点
/// </summary>
private Vector3 lastPosition; void Start()
{
if (Material == null)
{
Debug.LogError("请先赋予该脚本 Material !!");
} if (Target == null)
{
Debug.LogError("请设置目标");
} path = new List<Vector3>();
lastPosition = Target.position;
} void Update()
{
if (Vector3.Distance(Target.position, lastPosition) > Smooth)
{
path.Add(Target.position);
lastPosition = Target.position;
}
} /// <summary>
/// GL绘图必须在这个函数中进行
/// </summary>
void OnPostRender()
{
GL.PushMatrix();
Material.SetPass();
// 若要绘制2D线段，则取消注释GL.LoadOrtho();
//GL.LoadOrtho();
GL.Begin(GL.LINES); /*******在此处进行绘画*********/
DrawLines(path.ToArray()); GL.End();
GL.PopMatrix();
} private void DrawLine(Vector3 start, Vector3 end)
{
GL.Vertex3(start.x, start.y, start.z);
GL.Vertex3(end.x, end.y, end.z);
if (DebugDraw)
{
Debug.DrawLine(start, end, Color.red, );
}
} private void DrawLines(Vector3[] points)
{
if (points.Length == )
{
return;
} for (int i = ; i < points.Length - ; ++i)
{
var start = points[i];
var end = points[i + ];
GL.Vertex3(start.x, start.y, start.z);
GL.Vertex3(end.x, end.y, end.z);
if (DebugDraw)
{
Debug.DrawLine(start, end, Color.red, );
}
}
} public void ClearLine()
{
path.Clear();
} }