ModelRotation

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

namespace GyroGUI_v3
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }
        protected override void Initialize()
        {
            modelOrientation = Matrix.Identity;
            modelOrientation *= Matrix.CreateScale(1);

            base.Initialize();
        }
        Model myModel;
        float aspectRatio;
        Matrix modelOrientation;
        Vector3 modelPosition = Vector3.Zero;
        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

            myModel = Content.Load<Model>("Models\\p1_wedge");
            aspectRatio = (float)graphics.GraphicsDevice.Viewport.Width /
            (float)graphics.GraphicsDevice.Viewport.Height;
        }

        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            Vector3 position = modelOrientation.Translation;
            modelOrientation *= Matrix.CreateFromAxisAngle(new Vector3(1.0f, 1.0f, 0.0f), 0.2f);
            modelOrientation.Translation = position;
            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            foreach (ModelMesh mesh in myModel.Meshes)
            {
                foreach (BasicEffect effect in mesh.Effects)
                {
                    effect.EnableDefaultLighting();
                    effect.World = modelOrientation;
                    effect.View = Matrix.CreateLookAt(new Vector3(0.0f, 0.0f, 5000.0f), Vector3.Zero, Vector3.Up);
                    effect.Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(45.0f),
                        aspectRatio, 1.0f, 10000.0f);
                }
                mesh.Draw();
            }

            base.Draw(gameTime);
        }
    }
}