Unity创建自定义Mesh类TownsMesh

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class TownsMesh

{

    // Use this for initialization

    public int row = 80;

    public int column = 80;

    public int n_row = 20;

    public int n_column = 20;

    int num = 16;

    public Mesh[] tMesh;// = new Mesh[];

    private Vector3[] s_Vertives;

    private Vector2[] uv;

    //private Vector2[] newUV;

    Dictionary<int, Vector2[]> newUV = new Dictionary<int, Vector2[]>();

    GameObject[] tPolygon;

    //private

    private int[] hasmesh;

    private  Material material;

    public void DoCreatPloygonMesh(Vector3[] s_Vertives, Vector2[] uv, Vector3[] normals, Texture img, int z_row = 80, int z_column = 80, int N_row = 20, int N_column = 20)

    {

        row = z_row;

        column = z_column;

        n_row = N_row;

        n_column = N_column;

        num = (row / n_row) * (column / n_column);

        tPolygon = new GameObject[num];

        tMesh = new Mesh[num];

        for (int i = 0; i < num; i++)

        {

            tPolygon[i] = new GameObject("tPolygon" + i);

            tMesh[i] = new Mesh();

        }

        Dictionary<int, Vector3[]> tVertices = new Dictionary<int, Vector3[]>();

        Dictionary<int, List<int>> tTriangles = new Dictionary<int, List<int>>();

        for (int i = 0; i < num; i++)

        {

            tVertices[i] = new Vector3[n_row * n_column * 4];

            newUV[i] = new Vector2[n_row * n_column * 4];

            tTriangles[i] = new List<int>();

        }

        //Dictionary<int, List<int>> tTriangles = new Dictionary<int, List<int>>();

        for (int i = 0; i < num; i++)

        {

            tPolygon[i].AddComponent<MeshFilter>();

            tPolygon[i].AddComponent<MeshRenderer>();

            //tPolygon[i].GetComponent<Renderer>().material.shader = Shader.Find("Sprites/Default");

            if(material==null)

            {

                material = new Material(Shader.Find("Sprites/Default"));

                material.mainTexture = img;

            }

            tPolygon[i].GetComponent<Renderer>().material = material;

            //tPolygon[i].GetComponent<Renderer>().material.mainTexture = img;

        }

        for (int i = 0; i < s_Vertives.Length - 2; i++)

        {

            int n = i / 4;

            int c_row = n % row;

            int c_column = n / column;

            int r_row = c_row / n_row;

            int r_column = c_column / n_column;

            int w_id = r_column * (row / n_row) + r_row;

            if (i % 4 == 0)

            {

                int k_row = c_row % n_row;

                int k_column = c_column % n_column;

                int k = k_column * n_column + k_row;

                tTriangles[w_id].Add(0 + k * 4);

                tTriangles[w_id].Add(1 + k * 4);

                tTriangles[w_id].Add(2 + k * 4);

                tTriangles[w_id].Add(2 + k * 4);

                tTriangles[w_id].Add(3 + k * 4);

                tTriangles[w_id].Add(0 + k * 4);

                tVertices[w_id][k * 4] = s_Vertives[i];

                tVertices[w_id][k * 4 + 1] = s_Vertives[i + 1];

                tVertices[w_id][k * 4 + 2] = s_Vertives[i + 2];

                tVertices[w_id][k * 4 + 3] = s_Vertives[i + 3];

                newUV[w_id][k * 4] = uv[i];

                newUV[w_id][k * 4 + 1] = uv[i + 1];

                newUV[w_id][k * 4 + 2] = uv[i + 2];

                newUV[w_id][k * 4 + 3] = uv[i + 3];

            }

        }

        for (int i = 0; i < num; i++)

        {

            tMesh[i].vertices = tVertices[i];

            //赋值三角形点排序

            tMesh[i].triangles = tTriangles[i].ToArray();

            //tMesh.normals = normals;

            //tMesh.normals = normals;

            tMesh[i].uv = newUV[i];

            //重新设置UV，法线

            tMesh[i].RecalculateBounds();

            tMesh[i].RecalculateNormals();

            //将绘制好的Mesh赋值

            tPolygon[i].GetComponent<MeshFilter>().mesh = tMesh[i];

        }

    }

    public void SetMap(int id, Sprite sprite, bool fx)

    {

        float width = sprite.texture.width;

        float height = sprite.texture.height;

        int c_row = id % row;

        int c_column = id / column;

        int r_row = c_row / n_row;

        int r_column = c_column / n_column;

        int w_id = r_column * (row / n_row) + r_row;

        int k_row = c_row % n_row;

        int k_column = c_column % n_column;

        int k = k_column * n_column + k_row;

        //newUV[id*4] = new Vector2(sprite.rect.x / width, (sprite.rect.y + sprite.rect.height) / height)

        if (fx)

        {

            newUV[w_id][k * 4] = new Vector2(sprite.rect.x / width, (sprite.rect.y + sprite.rect.height) / height);

            newUV[w_id][k * 4 + 1] = new Vector2((sprite.rect.x + sprite.rect.width) / width, (sprite.rect.y + sprite.rect.height) / height);

            newUV[w_id][k * 4 + 2] = new Vector2((sprite.rect.x + sprite.rect.width) / width, sprite.rect.y / height);

            newUV[w_id][k * 4 + 3] = new Vector2(sprite.rect.x / width, sprite.rect.y / height);

        }

        else

        {

            newUV[w_id][k * 4 + 1] = new Vector2(sprite.rect.x / width, (sprite.rect.y + sprite.rect.height) / height);

            newUV[w_id][k * 4 + 0] = new Vector2((sprite.rect.x + sprite.rect.width) / width, (sprite.rect.y + sprite.rect.height) / height);

            newUV[w_id][k * 4 + 3] = new Vector2((sprite.rect.x + sprite.rect.width) / width, sprite.rect.y / height);

            newUV[w_id][k * 4 + 2] = new Vector2(sprite.rect.x / width, sprite.rect.y / height);

        }

        //tMesh.RecalculateBounds();

        //tMesh.RecalculateNormals();

        tMesh[w_id].uv = newUV[w_id];

    }

    public void SetMap2(int id)

    {

        int c_row = id % row;

        int c_column = id / column;

        int r_row = c_row / n_row;

        int r_column = c_column / n_column;

        int w_id = r_column * (row / n_row) + r_row;

        int k_row = c_row % n_row;

        int k_column = c_column % n_column;

        int k = k_column * n_column + k_row;

        newUV[w_id][k * 4] = new Vector2(0, 0);

        newUV[w_id][k * 4 + 1] = new Vector2(0, 0);

        newUV[w_id][k * 4 + 2] = new Vector2(0, 0);

        newUV[w_id][k * 4 + 3] = new Vector2(0, 0);

        //tMesh.RecalculateBounds();

        //tMesh.RecalculateNormals();

        tMesh[w_id].uv = newUV[w_id];

    }

    public void SetParent(Transform parent)

    {

        for (int i = 0; i < num; i++)

        {

            tPolygon[i].transform.SetParent(parent);

            tPolygon[i].layer = parent.gameObject.layer;

            tPolygon[i].transform.localPosition = Vector3.zero;

        }

    }

}


private void Creatmash()

    {

        float p_y = 0.0001f;

        float p_x = 0.0002f;

        if (tCreatMesh == null)

        {

            tCreatMesh = new TownsMesh();

            Vector3[] s_Vertives = new Vector3[(int)mapSize.x * (int)mapSize.y * 4];

            Vector2[] uv = new Vector2[(int)mapSize.x * (int)mapSize.y * 4];

            Vector3[] normals = new Vector3[(int)mapSize.x * (int)mapSize.y * 4];

            for (int row = 0; row < mapSize.x; row++)

            {

                for (int column = 0; column < mapSize.y; column++)

                {

                    var px2 = row * tileSizeX * 0.01f - (column) * tileSizeX * 0.01f;

                    var py2 = column * (0.01f * tileSizeY) + row * (0.01f * tileSizeY);

                    float depth = column + row + row * p_y + p_x * column;

                    Vector3 pos = new Vector3(px2, py2, depth);

                    int id = (int)((column * mapSize.x) + row);

                    s_Vertives[id * 4] = new Vector3(-1.0f, 1, 0) + pos;

                    s_Vertives[id * 4 + 1] = new Vector3(1, 1, 0) + pos;

                    s_Vertives[id * 4 + 2] = new Vector3(1, 0, 0) + pos;

                    s_Vertives[id * 4 + 3] = new Vector3(-1.0f, 0, 0) + pos;

                    uv[id * 4] = new Vector2(0, 0);

                    uv[id * 4 + 1] = new Vector2(0, 0);

                    uv[id * 4 + 2] = new Vector2(0, 0);

                    uv[id * 4 + 3] = new Vector2(0, 0);

                }

            }

            tCreatMesh.DoCreatPloygonMesh(s_Vertives, uv, normals, autotile.bitmaskSprites[0].texture, (int)mapSize.x, (int)mapSize.y,9,9);

            tCreatMesh.SetParent(transform);

        }

    }

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