Unity中mesh如何生成斜坡

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Mesh概念：

Mesh是Unity中的一个组件，称为网格组件。通俗的讲，Mesh是指模型的网格，3D模型是由多边形拼接而成，而多边形实际上是由多个三角形拼接而成的。所以一个3D模型的表面其实是由多个彼此相连的三角面构成。三维空间中，构成这些三角形的点和边的集合就是Mesh。

Mesh组成：

顶点坐标数组vertexes

顶点在uv坐标系中的位置信息数组uvs

三角形顶点顺时针或者逆时针索引数组triangles

MeshFiler组件，用于增加mesh属性

MeshRender组件，增加材质并渲染出来。

可能还需要每个顶点的法线的数组nORMals

using System.Collections;using System.Collections.Generic;using UnityEngine;public class MeshCreater : MonoBehaviour{    public Vector3 eulerAngles;    [Header("斜坡尺寸")]    public float sizeX;    public float sizeY;    public float sizeZ;    [Header("斜坡后面的立方体尺寸")]    public float planeSize;    public float m_angle;    public Material material;    Vector3[] vertices = new Vector3[54];    Vector2[] uvs = new Vector2[54];    List<int> allTris = new List<int>();    Vector3[] allPoint;    GameObject gameObject;    private void Update()    {        if (Input.GeTKEyDown(KeyCode.Space))        {            DrawMesh(m_angle);        }    }    public void DrawMesh(float angle)    {        if (gameObject != null)        {            Destroy(gameObject);        }        sizeX = sizeY * Mathf.Tan(angle * Mathf.PI / 180);        gameObject = new GameObject("Cube");        gameObject.transform.eulerAngles = eulerAngles;        var mf = gameObject.AddComponent<MeshFilter>();        var mr = gameObject.AddComponent<MeshRenderer>();        allPoint = new[]        {            //斜坡             new Vector3(0, 0, 0),             new Vector3(0, 0, sizeZ),             new Vector3(sizeX, 0, sizeZ),             new Vector3(sizeX, 0, 0),             new Vector3(0, sizeY, 0),             new Vector3(0, sizeY, sizeZ),             //斜坡后的立方体             new Vector3(0,-planeSize,0),             new Vector3(sizeX,-planeSize,0),             new Vector3(sizeX,-planeSize,sizeZ),             new Vector3(0,-planeSize,sizeZ),        };        //斜坡        vertices[0] = allPoint[0];  //正面        vertices[1] = allPoint[4];        vertices[2] = allPoint[3];        vertices[3] = allPoint[0]; //底面1        vertices[4] = allPoint[3];        vertices[5] = allPoint[2];        vertices[6] = allPoint[0];//底面1        vertices[7] = allPoint[2];        vertices[8] = allPoint[1];        vertices[9] = allPoint[1];  //背面1        vertices[10] = allPoint[4];        vertices[11] = allPoint[0];        vertices[12] = allPoint[4];//背面2        vertices[13] = allPoint[1];        vertices[14] = allPoint[5];        vertices[15] = allPoint[5]; //反面        vertices[16] = allPoint[1];        vertices[17] = allPoint[2];        vertices[18] = allPoint[2]; //斜坡1        vertices[19] = allPoint[3];        vertices[20] = allPoint[4];        vertices[21] = allPoint[2]; //斜坡1        vertices[22] = allPoint[4];        vertices[23] = allPoint[5];        //斜坡后的立方体        vertices[24] = allPoint[6];        vertices[25] = allPoint[0];        vertices[26] = allPoint[3];        vertices[27] = allPoint[6];        vertices[28] = allPoint[3];        vertices[29] = allPoint[7];        vertices[30] = allPoint[6];        vertices[31] = allPoint[9];        vertices[32] = allPoint[0];        vertices[33] = allPoint[0];        vertices[34] = allPoint[9];        vertices[35] = allPoint[1];        vertices[36] = allPoint[7];        vertices[37] = allPoint[3];        vertices[38] = allPoint[8];        vertices[39] = allPoint[8];        vertices[40] = allPoint[3];        vertices[41] = allPoint[2];        vertices[42] = allPoint[7];        vertices[43] = allPoint[8];        vertices[44] = allPoint[9];        vertices[45] = allPoint[7];        vertices[46] = allPoint[9];        vertices[47] = allPoint[6];        vertices[48] = allPoint[1];        vertices[49] = allPoint[9];        vertices[50] = allPoint[8];        vertices[51] = allPoint[1];        vertices[52] = allPoint[8];        vertices[53] = allPoint[2];        for (int i = 0; i < vertices.Length; i++)        {            allTris.Add(i);        }        uvs[0] = new Vector2(0, 0);        uvs[1] = new Vector2(0, 1);        uvs[2] = new Vector2(1, 0);        uvs[3] = new Vector2(0, 0);        uvs[4] = new Vector2(1, 0);        uvs[5] = new Vector2(1, 1);        uvs[6] = new Vector2(0f, 0f);        uvs[7] = new Vector2(1f, 1f);        uvs[8] = new Vector2(0f, 1f);        uvs[9] = new Vector2(0, 1);        uvs[10] = new Vector2(1, 0);        uvs[11] = new Vector2(0, 0);        uvs[12] = new Vector2(1, 0);        uvs[13] = new Vector2(0, 1);        uvs[14] = new Vector2(1, 1);        uvs[15] = new Vector2(0f, 1f);        uvs[16] = new Vector2(0, 0);        uvs[17] = new Vector2(1, 0);        uvs[18] = new Vector2(1f, 1f);        uvs[19] = new Vector2(1f, 0f);        uvs[20] = new Vector2(0f, 0f);        uvs[21] = new Vector2(1, 1);        uvs[22] = new Vector2(0, 0);        uvs[23] = new Vector2(0, 1);        uvs[24] = new Vector2(1, 1);        uvs[25] = new Vector2(0, 0);        uvs[26] = new Vector2(0, 1);        uvs[27] = new Vector2(1, 1);        uvs[28] = new Vector2(0, 0);        uvs[29] = new Vector2(0, 1);        uvs[30] = new Vector2(1, 1);        uvs[31] = new Vector2(0, 0);        uvs[32] = new Vector2(0, 1);        uvs[33] = new Vector2(1, 1);        uvs[34] = new Vector2(0, 0);        uvs[35] = new Vector2(0, 1);        uvs[36] = new Vector2(1, 1);        uvs[37] = new Vector2(0, 0);        uvs[38] = new Vector2(0, 1);        uvs[39] = new Vector2(1, 1);        uvs[40] = new Vector2(0, 0);        uvs[41] = new Vector2(0, 1);        uvs[42] = new Vector2(1, 1);        uvs[43] = new Vector2(0, 0);        uvs[44] = new Vector2(0, 1);        uvs[45] = new Vector2(1, 1);        uvs[46] = new Vector2(0, 0);        uvs[47] = new Vector2(0, 1);        uvs[48] = new Vector2(1, 1);        uvs[49] = new Vector2(0, 0);        uvs[50] = new Vector2(0, 1);        uvs[51] = new Vector2(1, 1);        uvs[52] = new Vector2(0, 0);        uvs[53] = new Vector2(0, 1);        Mesh mesh = new Mesh();        mesh.vertices = vertices;        mesh.uv = uvs;        mesh.triangles = allTris.ToArray();        mr.material = material;        mesh.RecalculateTangents();        mesh.RecalculateNormals();        mesh.RecalculateBounds();        mf.mesh = mesh;    }    private void OnDrawGizmos()    {        if (allPoint != null)        {            for (int i = 0; i < allPoint.Length; i++)            {                Gizmos.color = Color.yellow;                Gizmos.DrawSphere(allPoint[i], 0.1f);            }        }    }}

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