首先，下载一个shapes插件！

为shapes插件的立刻绘画模式创建一个脚本

using Shapes;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;namespace XXX
{[ExecuteAlways]public class DrawController : ImmediateModeShapeDrawer{public Camera cam;// Start is called before the first frame updatevoid Start(){}// Update is called once per framevoid Update(){}// called by the ImmediateModeShapeDrawer base typepublic override void DrawShapes(Camera cam){if (cam != this.cam) // only draw in the player camerareturn;using (Draw.Command(cam)){Draw.ZTest = CompareFunction.Less ; // to make sure it draws on top of everything like a HUD                                                    //Draw.Matrix = crosshairTransform.localToWorldMatrix; // draw it in the space of crosshairTransformDraw.BlendMode = ShapesBlendMode.Transparent;Draw.LineGeometry = LineGeometry.Flat2D;Draw.Thickness = 0.01f;//在这里写draw函数}}}
}

public class GridPos{public int width;public int height;private float cellSize;public Vector3 originPosition;public GridPos(int width, int height, float cellSize, Vector3 originPosition){this.width = width;this.height = height;this.cellSize = cellSize;this.originPosition = originPosition;//bool showDebug = false;//if (showDebug) {//    //TextMesh[,] debugTextArray = new TextMesh[width, height];//    for (int x = 0; x < this.width; x++) {//        for (int y = 0; y < this.height; y++) {//            //debugTextArray[x, y] = UtilsClass.CreateWorldText("", null, GetWorldPosition(x, y) + new Vector3(cellSize, cellSize) * .5f, 30, Color.white, TextAnchor.MiddleCenter);//            Debug.DrawLine(GetWorldPosition(x, y), GetWorldPosition(x, y + 1), Color.white, 100f);//            Debug.DrawLine(GetWorldPosition(x, y), GetWorldPosition(x + 1, y), Color.white, 100f);//        }//    }//    Debug.DrawLine(GetWorldPosition(0, height), GetWorldPosition(width, height), Color.white, 100f);//    Debug.DrawLine(GetWorldPosition(width, 0), GetWorldPosition(width, height), Color.white, 100f);//}}public int GetWidth(){return width;}public int GetHeight(){return height;}public float GetCellSize(){return cellSize;}public Vector3 GetWorldPosition(int x, int y){return new Vector3(x, y) * cellSize + originPosition;}public Vector3 GetWorldPosition2(int x, int y){return new Vector3(x, y) * cellSize + originPosition + new Vector3(cellSize / 2, cellSize / 2, 0);}//GetXY(worldPosition, out x, out y);public void GetXY(Vector3 worldPosition, out int x, out int y){x = Mathf.FloorToInt((worldPosition - originPosition).x / cellSize);y = Mathf.FloorToInt((worldPosition - originPosition).y / cellSize);}public List<Vector3> GetAllJustPoint(){List<Vector3> m_linePoints = new List<Vector3>();for (int x = 0; x < this.width; x++){for (int y = 0; y < this.height; y++){m_linePoints.Add(GetWorldPosition(x, y));}}return m_linePoints;}public List<Vector3[]> GetAllPoint(){List<Vector3[]> m_linePoints = new List<Vector3[]>();for (int x = 0; x < this.width; x++){for (int y = 0; y < this.height; y++){Vector3[] rows = new Vector3[2];rows[0] = GetWorldPosition(x, y);rows[1] = GetWorldPosition(x, y + 1);m_linePoints.Add(rows);Vector3[] cols = new Vector3[2];//debugTextArray[x, y] = UtilsClass.CreateWorldText("", null, GetWorldPosition(x, y) + new Vector3(cellSize, cellSize) * .5f, 30, Color.white, TextAnchor.MiddleCenter);cols[0] = GetWorldPosition(x, y);cols[1] = GetWorldPosition(x + 1, y);m_linePoints.Add(cols);}}Vector3[] rows2 = new Vector3[2];rows2[0] = GetWorldPosition(0, height);rows2[1] = GetWorldPosition(width, height);m_linePoints.Add(rows2);Vector3[] cols2 = new Vector3[2];cols2[0] = GetWorldPosition(width, 0);cols2[1] = GetWorldPosition(width, height);m_linePoints.Add(cols2);return m_linePoints;}

在文件中创建这样一个脚本。

使用这句话创建一个网格

 GridPos gp1 =new GridPos((int)width, (int)height, 1, new Vector3(0.5f, 0.5f, 0) + offposition);
List<Vector3[]> m_linePoints_point = gp1.GetAllPoint();//这是要绘画出来的点

然后用下列语句添加在 DrawController 中，进行绘制：

                for (int i = 0; i < m_linePoints_point.Count; i++){//Debug.Log(m_linePoints[i][0]);Draw.Line(m_linePoints_point[i][0], m_linePoints_point[i][1], UnityEngine.Color.gray);}