unity+Mesh创建

待我称王封你为后i 2021-11-05 09:01 231阅读 0赞

参考链接：

Unity3D之Mesh（一）绘制三角形 - 乐学习 - 博客园 https://www.cnblogs.com/JLZT1223/p/6080164.html

Unity3D之Mesh（七）绘制长方体 - 乐学习 - 博客园 https://www.cnblogs.com/JLZT1223/p/6089996.html

实现效果如图所示：（其实这就是一个gameobject展示出来的效果，如果想完成两万个小立方体的效果，可以拼接这个K02 ）

![1285227-20190801185549638-1162725817.png][]

unity中新建一个空物体，加上组件MeshRenderer和MeshFilter

新建一个材质球createMesh拖入meshrenderer中

![1285227-20190801183320183-1416336366.png][]

代码如下所示：

using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    
    [RequireComponent(typeof(MeshRenderer), typeof(MeshFilter))]
    public class CreateMesh : MonoBehaviour {
        public float Length = 1;              //长方体的长
        public float Width = 1;               //长方体的宽
        public float Heigth = 1;              //长方体的高
        private MeshFilter meshFilter;
        List<Vector3> lstVertices = new List<Vector3>();
        List<int> lstIndices = new List<int>();
        List<Vector3> lstNormals = new List<Vector3>();
    
        void Start()
        {
            meshFilter = GetComponent<MeshFilter>();
            //旧版本，一个立方体
            //meshFilter.mesh = OnCreateMesh(Length, Width, Heigth);
    
            一个正方体不包含法线
            //meshFilter.mesh = OnCreateMeshSmipleNONormal(Length, Width, Heigth);
    
            //最完整的方法，10*10*10个立方体mesh新方法包含法线
            OnCreateNewMeshNormal();
    
        }
        //最完整的方法，10*10*10个立方体mesh新方法包含法线
        private void OnCreateNewMeshNormal()
        {
            
            for (int i = 0; i < 10; i++)
            {
                for (int j = 0; j < 10; j++)
                {
                    for (int k = 0; k < 10; k++)
                    {
                        OnCreateTriangles(Length, Width, Heigth, new Vector3(i * 2, j * 2, k * 2));
    
                    }
                }
            }
            //负载属性与mesh
            Mesh mesh = new Mesh();
            mesh.vertices = lstVertices.ToArray();
            mesh.triangles = lstIndices.ToArray();
            mesh.normals = lstNormals.ToArray();
            meshFilter.mesh = mesh;
        }
    
        void  OnCreateTriangles(float length, float width, float heigth, Vector3 trans)
        {                              
            Vector3[] vertices = new Vector3[4 * 6];               //顶点数（每个面4个点，六个面）
            Vector3[] normals = new Vector3[4 * 6];                 //法线 （每个面4个点，六个面）
            vertices[0] = new Vector3(0, 0, 0);                     //前面的左下角的点
            normals[0] = new Vector3(0, 0, -1);
            vertices[1] = new Vector3(0, heigth, 0);                //前面的左上角的点
            normals[1] = new Vector3(0, 0, -1); ;
            vertices[2] = new Vector3(length, 0, 0);                //前面的右下角的点
            normals[2] = new Vector3(0, 0, -1); ;
            vertices[3] = new Vector3(length, heigth, 0);           //前面的右上角的点
            normals[3] = new Vector3(0, 0, -1); ;
    
            vertices[4] = new Vector3(length, 0, width);           //后面的右下角的点
            normals[4] = new Vector3(0, 0, 1);
            vertices[5] = new Vector3(length, heigth, width);      //后面的右上角的点
            normals[5] = new Vector3(0, 0, 1);
            vertices[6] = new Vector3(0, 0, width);                //后面的左下角的点
            normals[6] = new Vector3(0, 0, 1);
            vertices[7] = new Vector3(0, heigth, width);           //后面的左上角的点
            normals[7] = new Vector3(0, 0, 1);
    
            vertices[8] = vertices[6];                              //左
            normals[8] = new Vector3(-1, 0, 0);
            vertices[9] = vertices[7];
            normals[9] = new Vector3(-1, 0, 0);
            vertices[10] = vertices[0];
            normals[10] = new Vector3(-1, 0, 0);
            vertices[11] = vertices[1];
            normals[11] = new Vector3(-1, 0, 0);
    
            vertices[12] = vertices[2];                              //右
            normals[12] = new Vector3(1, 0, 0);
            vertices[13] = vertices[3];
            normals[13] = new Vector3(1, 0, 0);
            vertices[14] = vertices[4];
            normals[14] = new Vector3(1, 0, 0);
            vertices[15] = vertices[5];
            normals[15] = new Vector3(1, 0, 0);
    
            vertices[16] = vertices[1];                              //上
            normals[16] = new Vector3(0, 1, 0);
            vertices[17] = vertices[7];
            normals[17] = new Vector3(0, 1, 0);
            vertices[18] = vertices[3];
            normals[18] = new Vector3(0, 1, 0);
            vertices[19] = vertices[5];
            normals[19] = new Vector3(0, 1, 0);
    
            vertices[20] = vertices[2];                              //下
            normals[20] = new Vector3(0, -1, 0);
            vertices[21] = vertices[4];
            normals[21] = new Vector3(0, -1, 0);
            vertices[22] = vertices[0];
            normals[22] = new Vector3(0, -1, 0);
            vertices[23] = vertices[6];
            normals[23] = new Vector3(0, -1, 0);
    
            int nStartIndex = lstVertices.Count;
            for(int i = 0; i < vertices.Length; i++)
            {
                lstVertices.Add(vertices[i] + trans);
            }
            lstNormals.AddRange(normals);
    
            //triangles(索引三角形、必须):
            int triangles_cout = 6 * 2 * 3;                  //索引三角形的索引点个数
            int[] triangles = new int[triangles_cout];            //索引三角形数组
            for (int i = 0, vi = 0; i < triangles_cout; i += 6, vi += 4)
            {
                triangles[i] = vi;
                triangles[i + 1] = vi + 1;
                triangles[i + 2] = vi + 2;
    
                triangles[i + 3] = vi + 3;
                triangles[i + 4] = vi + 2;
                triangles[i + 5] = vi + 1;
            }
           
            //int[] triangles2 = new int[6 * 2 * 3] {1,0,2, 3,1,2,
            //                            3,2,4, 4,5,3,
            //                            6,7,4, 7,5,4,
            //                            7,6,1, 6,0,1,
            //                            7,1,3, 3,5,7,
            //                            0,6,2, 6,4,2};            //索引三角形数组
            for (int i = 0; i < triangles.Length; i++)
            {
                lstIndices.Add(triangles[i] + nStartIndex);
            }
        }
        //没有法线，一个立方体，没有重复的点
        Mesh OnCreateMeshSmipleNONormal(float length, float width, float heigth)
        {
            //vertices(顶点、必须):
            int vertices_count = 4 * 6;                                 //顶点数（每个面4个点，六个面）
            Vector3[] vertices = new Vector3[vertices_count];
            vertices[0] = new Vector3(0, 0, 0);                     //前面的左下角的点
            vertices[1] = new Vector3(0, heigth, 0);                //前面的左上角的点
            vertices[2] = new Vector3(length, 0, 0);                //前面的右下角的点
            vertices[3] = new Vector3(length, heigth, 0);           //前面的右上角的点
    
            vertices[4] = new Vector3(length, 0, width);           //后面的右下角的点
            vertices[5] = new Vector3(length, heigth, width);      //后面的右上角的点
            vertices[6] = new Vector3(0, 0, width);                //后面的左下角的点
            vertices[7] = new Vector3(0, heigth, width);           //后面的左上角的点
            int[] triangles2 = new int[6 * 2 * 3] {1,0,2, 3,1,2,
                                         3,2,4, 4,5,3,
                                         6,7,4, 7,5,4,
                                         7,6,1, 6,0,1,
                                         7,1,3, 3,5,7,
                                         0,6,2, 6,4,2};            //索引三角形数组
    
            //uv:
            //.........
    
            //负载属性与mesh
            Mesh mesh = new Mesh();
            mesh.vertices = vertices;
            mesh.triangles = triangles2;
            return mesh;
        }
        //最原始，重复点，无法线
        Mesh OnCreateMesh(float length, float width, float heigth)
        {
    
            //vertices(顶点、必须):
            int vertices_count = 4 * 6;                                 //顶点数（每个面4个点，六个面）
            Vector3[] vertices = new Vector3[vertices_count];
            vertices[0] = new Vector3(0, 0, 0);                     //前面的左下角的点
            vertices[1] = new Vector3(0, heigth, 0);                //前面的左上角的点
            vertices[2] = new Vector3(length, 0, 0);                //前面的右下角的点
            vertices[3] = new Vector3(length, heigth, 0);           //前面的右上角的点
    
            vertices[4] = new Vector3(length, 0, width);           //后面的右下角的点
            vertices[5] = new Vector3(length, heigth, width);      //后面的右上角的点
            vertices[6] = new Vector3(0, 0, width);                //后面的左下角的点
            vertices[7] = new Vector3(0, heigth, width);           //后面的左上角的点
    
            vertices[8] = vertices[6];                              //左
            vertices[9] = vertices[7];
            vertices[10] = vertices[0];
            vertices[11] = vertices[1];
    
            vertices[12] = vertices[2];                              //右
            vertices[13] = vertices[3];
            vertices[14] = vertices[4];
            vertices[15] = vertices[5];
    
            vertices[16] = vertices[1];                              //上
            vertices[17] = vertices[7];
            vertices[18] = vertices[3];
            vertices[19] = vertices[5];
    
            vertices[20] = vertices[2];                              //下
            vertices[21] = vertices[4];
            vertices[22] = vertices[0];
            vertices[23] = vertices[6];
    
    
            //triangles(索引三角形、必须):
            int 分割三角形数 = 6 * 2;
            int triangles_cout = 分割三角形数 * 3;                  //索引三角形的索引点个数
            int[] triangles = new int[triangles_cout];            //索引三角形数组
            for (int i = 0, vi = 0; i < triangles_cout; i += 6, vi += 4)
            {
                triangles[i] = vi;
                triangles[i + 1] = vi + 1;
                triangles[i + 2] = vi + 2;
    
                triangles[i + 3] = vi + 3;
                triangles[i + 4] = vi + 2;
                triangles[i + 5] = vi + 1;
    
            }
    
            //uv:
            //.........
    
            //负载属性与mesh
            Mesh mesh = new Mesh();
            mesh.vertices = vertices;
            mesh.triangles = triangles;
            return mesh;
        }
    }

![1285227-20190801185117817-132956458.png][]

转载于:https://www.cnblogs.com/WalkingSnail/p/11284576.html

[1285227-20190801185549638-1162725817.png]: /images/20211104/30a8ef7dd34a42a78d980d39576b4584.png
[1285227-20190801183320183-1416336366.png]: /images/20211104/2b61ee6ef3834c1b8a24a06edbf7d92a.png
[1285227-20190801185117817-132956458.png]: /images/20211104/814962d818414de3880bf368ca86a47b.png