Вращение треугольника (Directx9)

using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
 
namespace One3D
{
    public partial class Form1 : Form
    {
        private Device device = null;
        private float angle = 0.0f;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, System.EventArgs e)
        {
            PresentParameters presentParameters = new PresentParameters();
            presentParameters.Windowed = true;
            presentParameters.SwapEffect = SwapEffect.Discard;
            presentParameters.AutoDepthStencilFormat = DepthFormat.D16;
            presentParameters.EnableAutoDepthStencil = true;
 
            device = new Device(0, DeviceType.Hardware, this,
                CreateFlags.HardwareVertexProcessing, presentParameters);
        }
 
        private void SetupCamera() 
        {
            device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Height, 1.0f, 100.0f);
            device.Transform.View = Matrix.LookAtLH(new Vector3(0, 3, 5), new Vector3(), new Vector3(0, 1, 0));
            device.RenderState.Lighting = false;
            //работает неправильно
            device.Transform.World = Matrix.RotationAxis(new Vector3(angle /((float)Math.PI * 2.0f),
                angle / ((float)Math.PI * 4.0f), angle / ((float)Math.PI * 6.0f)),
                angle / (float)Math.PI);
            angle += 0.1f;
            device.RenderState.CullMode = Cull.None;
        }
 
        protected override void OnPaint(PaintEventArgs e)
        {
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque,true);
            device.Clear(ClearFlags.Target, System.Drawing.Color.CornflowerBlue, 1.0f, 0);
            SetupCamera();
 
            CustomVertex.PositionColored[] verts = new CustomVertex.PositionColored[3];
            verts[0].Position = new Vector3(0.0f, 1.0f, 1.0f);
            verts[0].Color = Color.Aqua.ToArgb();
            verts[1].Position = new Vector3(-1.0f, -1.0f, 1.0f);
            verts[1].Color = Color.Black.ToArgb();
            verts[2].Position = new Vector3(1.0f, -1.0f, 1.0f);
            verts[2].Color = Color.Purple.ToArgb();
 
            device.BeginScene();
            device.VertexFormat = CustomVertex.PositionColored.Format;
            device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, verts);
            device.EndScene();
            device.Present();
            this.Invalidate();
        }
    }
}

device.Clear(ClearFlags.Target, Color.CornflowerBlue, 1.0f, 0);

device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.CornflowerBlue, 1.0f, 0);