public static class VoxelData {
    //存储体素的八个顶点信息
    public static readonly Vector3[] voxelVerts = new Vector3[8] {
        new Vector3(0f, 0f, 0f),
        new Vector3(1f, 0f, 0f),
        new Vector3(1f, 1f, 0f),
        new Vector3(0f, 1f, 0f),
        new Vector3(0f, 0f, 1f),
        new Vector3(1f, 0f, 1f),
        new Vector3(1f, 1f, 1f),
        new Vector3(0f, 1f, 1f),
    };
    //存储三角形面片的数据
    public static readonly int[,] voxelTris = new int[6, 6] {
        {0,3,1,1,3,2},//front
        {5,6,4,4,6,7},//back
        {3,7,2,2,7,6},//top
        {1,5,0,0,5,4},//bottom
        {4,7,0,0,7,3},//left
        {1,2,5,5,2,6},//right
    };
}

int vertexIndex = 0;//顶点索引
List<Vector3> vertices = new List<Vector3>();//顶点列表 
List<int> triangles = new List<int>();//三角形列表
List<Vector2> uvs = new List<Vector2>();//uv列表
for (int i = 0; i < VoxelData.voxelTris.GetLength(0); i++) {
    for (int j = 0; j < VoxelData.voxelTris.GetLength(1); j++) {
        //存储一个面的两个三角形顶点信息
        int triangleIndex = VoxelData.voxelTris[i, j];
        vertices.Add(VoxelData.voxelVerts[triangleIndex]);
        
        uvs.Add(Vector2.zero);
        triangles.Add(vertexIndex);
        vertexIndex++;
    }
}
Mesh mesh = new Mesh();//创建网格
mesh.vertices = vertices.ToArray();//为网格设置顶点数组,每个顶点为一个三维向量
mesh.triangles = triangles.ToArray();//为网格指定三角形片元数据,int数组
mesh.uv = uvs.ToArray();//uv数据
mesh.RecalculateNormals();//从三角形和顶点重新计算网格的法线

meshFilter.mesh = mesh;

//面片顶点索引数据
public static readonly int[,] voxelTris = new int[6, 4] {
    //优化的去除重复数据
    {0,3,1,2},//back
    {5,6,4,7},//front
    {3,7,2,6},//top
    {1,5,0,4},//bottom
    {4,7,0,3},//left
    {1,2,5,6},//right
};
//uv
public static readonly Vector2[] voxelUvs = new Vector2[4] {
    //优化的去除重复数据
    new Vector2(0, 0),
    new Vector2(0, 1),
    new Vector2(1, 0),
    new Vector2(1, 1),
};

// textureID
void AddTexture(int textureID) {
    //VoxelData.TextureAtlasSizeInBlock 贴图的分割数 4
    //VoxelData.NormalizedBlockTextureSize 贴图分割数倒数 0.25
    float y = textureID / VoxelData.TextureAtlasSizeInBlock;
    float x = textureID - (y * VoxelData.TextureAtlasSizeInBlock);
    
    x *= VoxelData.NormalizedBlockTextureSize;
    y *= VoxelData.NormalizedBlockTextureSize;

    y = 1f - y - VoxelData.NormalizedBlockTextureSize;
    //这里计算出贴图的起始坐标
    //按照0 1 2 3的UV索引为uv列表添加数据,下面是一个面片四个顶点的UV坐标值
    uvs.Add(new Vector2(x,y));
    uvs.Add(new Vector2(x,y + VoxelData.NormalizedBlockTextureSize));
    uvs.Add(new Vector2(x + VoxelData.NormalizedBlockTextureSize,y));
    uvs.Add(new Vector2(x + VoxelData.NormalizedBlockTextureSize,y + VoxelData.NormalizedBlockTextureSize));
}