Unity自定义mesh绘制  基于上篇的mesh修改，实现tile map

第一步，修改mesh 顶点和三角片信息，生成方格

顶点信息就是一系列正方形的组合，三角片，在这里实现的方法是一个矩形由2个三角形组成，注意，三角形的顺序依赖于顶点的顺序，三角形的三个点按照观察方向顺时针，三角形数量=顶点数量*6，6=2*3,2是三角形个数，3是一个三角形 由3个顶点组成，输入的三角数组的顺序是，对应顶点在输入的顶点数据中的index，贴代码：

using UnityEngine;
using System.Collections;public class ss5 : MonoBehaviour
{void Start(){dooo();}void dooo(){{MeshFilter filter = this.GetComponent<MeshFilter>();MeshRenderer render = this.GetComponent<MeshRenderer>();var mesh = filter.mesh;var ts = this.GetComponentsInChildren<Transform>();Vector3[] vers = new Vector3[ts.Length];for (int i = 0; i < ts.Length; i++){vers[i] = ts[i].position;}const int MAX_X = 30;const int MAX_Y = 30;Vector3[] vertics = new Vector3[MAX_Y * MAX_X];for (int x = 0; x < MAX_X; x++){for (int y = 0; y < MAX_Y; y++){vertics[x + MAX_X * y] = new Vector3(x, 0f, y);}}foreach (var p in vertics){Ray ray = new Ray(p, new Vector3(-100f, -100f, -100f));Debug.DrawLine(ray.GetPoint(-0.1f), ray.GetPoint(0.1f), Color.red);}int[] triss = new int[(MAX_Y - 1) * (MAX_X - 1) * 6];for (int x = 0; x < MAX_X - 1; x++){for (int y = 0; y < MAX_Y - 1; y++){var p = vertics[x + MAX_X * y];int baseIdx = 0;if (y >= 1){baseIdx = (y * (MAX_X - 1) * 6) + x * 6;}else{baseIdx = x * 6;}Debug.LogError(x + "   " + y + "    " + triss.Length + "  baseIdx=" + baseIdx);triss[baseIdx + 0] = x + y * MAX_X;triss[baseIdx + 1] = x + (y + 1) * MAX_X;triss[baseIdx + 2] = (x + 1) + y * MAX_X;triss[baseIdx + 3] = x + (y + 1) * MAX_X;triss[baseIdx + 4] = (x + 1) + (y + 1) * MAX_X;triss[baseIdx + 5] = (x + 1) + y * MAX_X; ;/*   triss[x + y * MAX_X + 0] = 0;triss[x + y * MAX_X + 1] = 2;triss[x + y * MAX_X + 2] = 1;triss[x + y * MAX_X + 3] = 2;triss[x + y * MAX_X + 4] = 3;triss[x + y * MAX_X + 5] = 1;*//* triss[(x * 2 + y * 9 * 2) + 0] = 5;triss[(x * 2 + y * 9 * 2) + 1] = 5;triss[(x * 2 + y * 9 * 2) + 2] = 5;triss[(x * 2 + y * 9 * 2) + 3] = 5;triss[(x * 2 + y * 9 * 2) + 4] = 5;triss[(x * 2 + y * 9 * 2) + 5] = 5;*/}}mesh.vertices = vertics;mesh.triangles = triss;// this.GetTris(vers);mesh.RecalculateNormals();mesh.RecalculateBounds();this.GetComponent<MeshCollider>().sharedMesh = mesh;filter.mesh = mesh;return;}}void Update(){}void OnDrawGizmos(){return;{MeshFilter filter = this.GetComponent<MeshFilter>();MeshRenderer render = this.GetComponent<MeshRenderer>();var mesh = filter.mesh;var ts = this.GetComponentsInChildren<Transform>();Vector3[] vers = new Vector3[ts.Length];for (int i = 0; i < ts.Length; i++){vers[i] = ts[i].position;}const int MAX_X = 3;const int MAX_Y = 3;Vector3[] vertics = new Vector3[MAX_Y * MAX_X];for (int x = 0; x < MAX_X; x++){for (int y = 0; y < MAX_Y; y++){vertics[x + MAX_X * y] = new Vector3(x, 0f, y);}}foreach (var p in vertics){Ray ray = new Ray(p, new Vector3(-100f, -100f, -100f));Debug.DrawLine(ray.GetPoint(-0.1f), ray.GetPoint(0.1f), Color.red);}int[] triss = new int[(MAX_Y - 1) * (MAX_X - 1) * 6];for (int x = 0; x < MAX_X - 1; x++){for (int y = 0; y < MAX_Y - 1; y++){var p = vertics[x + MAX_X * y];int baseIdx = 0;if (y >= 1){baseIdx = (y * (MAX_X - 1) * 6) + x * 6;}else{baseIdx = x * 6;}Debug.LogError(x + "   " + y + "    " + triss.Length + "  baseIdx=" + baseIdx);triss[baseIdx + 0] = x + y * MAX_X;triss[baseIdx + 1] = x + (y + 1) * MAX_X;triss[baseIdx + 2] = (x + 1) + y * MAX_X;triss[baseIdx + 3] = x + (y + 1) * MAX_X;triss[baseIdx + 4] = (x + 1) + (y + 1) * MAX_X;triss[baseIdx + 5] = (x + 1) + y * MAX_X; ;/*   triss[x + y * MAX_X + 0] = 0;triss[x + y * MAX_X + 1] = 2;triss[x + y * MAX_X + 2] = 1;triss[x + y * MAX_X + 3] = 2;triss[x + y * MAX_X + 4] = 3;triss[x + y * MAX_X + 5] = 1;*//* triss[(x * 2 + y * 9 * 2) + 0] = 5;triss[(x * 2 + y * 9 * 2) + 1] = 5;triss[(x * 2 + y * 9 * 2) + 2] = 5;triss[(x * 2 + y * 9 * 2) + 3] = 5;triss[(x * 2 + y * 9 * 2) + 4] = 5;triss[(x * 2 + y * 9 * 2) + 5] = 5;*/}}mesh.vertices = vertics;mesh.triangles = triss;// this.GetTris(vers);mesh.RecalculateNormals();mesh.RecalculateBounds();this.GetComponent<MeshCollider>().sharedMesh = mesh;filter.mesh = mesh;return;} }}

第二步：修改UV信息，U是x轴，V是y轴，矩形4个顶点 对应UV4个坐标点，在这里是逆时针，UV也是逆时针。因此只需要一张大贴图 附上对应的UV信息 就可以实现tile map了