Как сделать куб, сторонами которого является заданный квадрат

using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
 
namespace texture
{
    public partial class Form1 : Form
    {
        Device device;
        Texture texture;
 
        public float angle { get; set; }
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
 
            var presentParameters = new PresentParameters()
            {
                Windowed = true,
                SwapEffect = SwapEffect.Discard
            };
 
            device = new Device(0, DeviceType.Hardware, Handle, CreateFlags.SoftwareVertexProcessing, presentParameters);
        }
 
        private void SetupCamera()
        {
            device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, Width / Height, 1.0f, 100.0f);
            device.Transform.View = Matrix.LookAtLH(new Vector3(0, 0, 8.0f), new Vector3(), new Vector3(0, 1, 0));
            device.RenderState.Lighting = false;
            device.Transform.World = Matrix.RotationYawPitchRoll(angle / (float)Math.PI, angle / (float)Math.PI * 2.0f, angle / (float)Math.PI);
            angle += 0.1f;
        }
 
        protected override void OnPaint(PaintEventArgs e)
        {
            device.Clear(ClearFlags.Target, Color.CornflowerBlue, 1.0f, 0);
            SetupCamera();
            CustomVertex.PositionTextured[] verts = new CustomVertex.PositionTextured[36];
            // Front face
            verts[0] = new CustomVertex.PositionTextured(-1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            verts[1] = new CustomVertex.PositionTextured(-1.0f, -1.0f, 1.0f, 0.0f, 1.0f);
            verts[2] = new CustomVertex.PositionTextured(1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
            verts[3] = new CustomVertex.PositionTextured(-1.0f, -1.0f, 1.0f, 0.0f, 1.0f);
            verts[4] = new CustomVertex.PositionTextured(1.0f, -1.0f, 1.0f, 1.0f, 1.0f);
            verts[5] = new CustomVertex.PositionTextured(1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
            // Back face (remember this is facing *away* from the camera, so vertices should be clockwise order)
            verts[6] = new CustomVertex.PositionTextured(-1.0f, 1.0f, -1.0f, 0.0f, 0.0f);
            verts[7] = new CustomVertex.PositionTextured(1.0f, 1.0f, -1.0f, 1.0f, 0.0f);
            verts[8] = new CustomVertex.PositionTextured(-1.0f, -1.0f, -1.0f, 0.0f, 1.0f);
            verts[9] = new CustomVertex.PositionTextured(-1.0f, -1.0f, -1.0f, 0.0f, 1.0f);
            verts[10] = new CustomVertex.PositionTextured(1.0f, 1.0f, -1.0f, 1.0f, 0.0f);
            verts[11] = new CustomVertex.PositionTextured(1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
            // Top face
            verts[12] = new CustomVertex.PositionTextured(-1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            verts[13] = new CustomVertex.PositionTextured(1.0f, 1.0f, -1.0f, 1.0f, 1.0f);
            verts[14] = new CustomVertex.PositionTextured(-1.0f, 1.0f, -1.0f, 0.0f, 1.0f);
            verts[15] = new CustomVertex.PositionTextured(-1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            verts[16] = new CustomVertex.PositionTextured(1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
            verts[17] = new CustomVertex.PositionTextured(1.0f, 1.0f, -1.0f, 1.0f, 1.0f);
            // Bottom face (remember this is facing *away* from the camera, so vertices should be clockwise order)
            verts[18] = new CustomVertex.PositionTextured(-1.0f, -1.0f, 1.0f, 0.0f, 0.0f);
            verts[19] = new CustomVertex.PositionTextured(-1.0f, -1.0f, -1.0f, 0.0f, 1.0f);
            verts[20] = new CustomVertex.PositionTextured(1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
            verts[21] = new CustomVertex.PositionTextured(-1.0f, -1.0f, 1.0f, 0.0f, 0.0f);
            verts[22] = new CustomVertex.PositionTextured(1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
            verts[23] = new CustomVertex.PositionTextured(1.0f, -1.0f, 1.0f, 1.0f, 0.0f);
            // Left face
            verts[24] = new CustomVertex.PositionTextured(-1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            verts[25] = new CustomVertex.PositionTextured(-1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
            verts[26] = new CustomVertex.PositionTextured(-1.0f, -1.0f, 1.0f, 1.0f, 0.0f);
            verts[27] = new CustomVertex.PositionTextured(-1.0f, 1.0f, -1.0f, 0.0f, 1.0f);
            verts[28] = new CustomVertex.PositionTextured(-1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
            verts[29] = new CustomVertex.PositionTextured(-1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            // Right face (remember this is facing *away* from the camera, so vertices should be clockwise order)
            verts[30] = new CustomVertex.PositionTextured(1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            verts[31] = new CustomVertex.PositionTextured(1.0f, -1.0f, 1.0f, 1.0f, 0.0f);
            verts[32] = new CustomVertex.PositionTextured(1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
            verts[33] = new CustomVertex.PositionTextured(1.0f, 1.0f, -1.0f, 0.0f, 1.0f);
            verts[34] = new CustomVertex.PositionTextured(1.0f, 1.0f, 1.0f, 0.0f, 0.0f);
            verts[35] = new CustomVertex.PositionTextured(1.0f, -1.0f, -1.0f, 1.0f, 1.0f);
 
            texture = new Texture(device, new Bitmap("pic.bmp"), Usage.Dynamic, Pool.Default);
            device.SetTexture(0, texture);
            device.BeginScene();
            device.VertexFormat = CustomVertex.PositionTextured.Format;
            device.DrawUserPrimitives(PrimitiveType.TriangleList, 12, verts);
            device.EndScene();
            device.Present();
            Invalidate();
        }
    }
}

Mesh mesh;
private void Form1_Load(object sender, EventArgs e)
        {
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
 
            var presentParameters = new PresentParameters()
            {
                Windowed = true,
                SwapEffect = SwapEffect.Discard
            };
 
            device = new Device(0, DeviceType.Hardware, Handle, CreateFlags.HardwareVertexProcessing, presentParameters);
 
            mesh = Mesh.Box(device, 2.0f, 2.0f, 2.0f);
        }