使用LineRender绘制网格线

参考：https://www.xuanyusong.com/archives/561

可用于场景内变化的坐标数据的测试（浮空地块顶点数据一直在变 ）

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TestLineRender : MonoBehaviour {
    private Vector3 v0 = new Vector3(1.0f, 0.0f, 0.0f);
    private Vector3 v1 = new Vector3(0.0f, 1.0f, 0.0f);
    private Vector3 v2 = new Vector3(0.0f, 0.0f, 1.0f);

    private LineRenderer lineRender = null;

    // Use this for initialization
    void Start () 
    {
        lineRender = gameObject.AddComponent<LineRenderer>();
        lineRender.material = new Material(Shader.Find("Sprites/Default"));
        lineRender.startColor = Color.blue;
        lineRender.endColor = Color.blue;
        lineRender.startWidth = 0.01f;
        lineRender.endWidth = 0.01f;
        lineRender.useWorldSpace = true;
        lineRender.positionCount = 4;
    }

    // Update is called once per frame
    void Update () 
    {
        lineRender.SetPosition(0, v0);
        lineRender.SetPosition(1, v1);
        lineRender.SetPosition(2, v2);
        lineRender.SetPosition(3, v0);
    }
}