【游戏-网格】使用Mesh网格生成圆柱网格。Mesh不止可以用于绘制图形，还可以用来生成圆柱

CylinderDemo.cs

//一个顶点，可以分配一个UV信息，也就是说如果生成一个6边的圆柱，你需要7个边的顶点，第一边和最后一边重合，来生成0-1之间的UV值，包括法线，切线，颜色等，如果你需要一个顶点有3个法线面向，那就需要在这个位置生成3个顶点。

//源代码：
public Mesh CreateMesh(int edg_x, int edg_y, float rad, float len)
{
    edg_x = Mathf.Max(2, edg_x);//保证最低2个边
    edg_y = Mathf.Max(2, edg_y);
    int _deglen = edg_x * edg_y + edg_y;
    normals = new Vector3[_deglen];
    verts = new Vector3[_deglen];
    uvs = new Vector2[_deglen];
    int[] trians = new int[edg_x * (edg_y - 1) * 6];
    float reg = 6.28318f / edg_x;
    float _len = len / (edg_y - 1);
    Vector2 uvStep = new Vector2(1f / edg_x, 1f / (edg_y - 1));
    for (int y = 0; y < edg_y; y++)
        for (int x = 0; x < edg_x + 1; x++)//多一个边来保存UV值
        {
            int i = x + y * (edg_x + 1);
            verts[i] = new Vector3(Mathf.Sin((reg * (x % edg_x) + angle) % 6.28318f) * rad, Mathf.Cos((reg * (x % edg_x) + angle) % 6.28318f) * rad, y * _len);//计算顶点坐标
            normals[i] = -new Vector3(verts[i].x, verts[i].y, 0);//计算法线方向
            int id = x % (edg_x + 1) * 6 + y * edg_x * 6;
            if (x < edg_x + 1 && y < edg_y - 1 && (id + 5) < trians.Length)//计算顶点数组
            {
                trians[id] = i;
                trians[id + 1] = trians[id + 4] = i + edg_x + 1;
                trians[id + 2] = trians[id + 3] = i + 1;
                trians[id + 5] = i + edg_x + 2;
            }
            if (edg_x != 2)//计算UV，考虑到2个边的情况
                uvs[i] = new Vector2(x == edg_x ? 1f : uvStep.x * x, y == edg_y - 1 ? 1f : uvStep.y * y);
            else
                uvs[i] = new Vector2(x % edg_x, y == edg_y - 1 ? 1f : uvStep.y * y);
        }
    Mesh mesh = new Mesh();
    mesh.vertices = verts;
    mesh.triangles = trians;
    mesh.uv = uvs;
    mesh.normals = normals;
    return mesh;
}

https://gameinstitute.qq.com/community/detail/128614