player class

    class Player
    {
        Model playerModel;
        public Matrix playerWorld;
        Matrix[] playerTransforms;

        float speed = 200f;
        float rotationRate = 0.3f;

        public Player()
        {
            playerWorld = Matrix.CreateScale(0.1f);
        }

        public void LoadContent(ContentManager content)
        {
            playerModel = content.Load<Model>("playerModel");
            playerTransforms = new Matrix[playerModel.Bones.Count];
            playerModel.CopyAbsoluteBoneTransformsTo(playerTransforms);

        }


        public void Update(float dt)
        {
            KeyboardState kbs = Keyboard.GetState();

            if (kbs.IsKeyDown(Keys.W))
                playerWorld *= Matrix.CreateTranslation(playerWorld.Forward * speed * dt);

            if(kbs.IsKeyDown(Keys.S))
                playerWorld *= Matrix.CreateTranslation(playerWorld.Backward * speed * dt);

            if (kbs.IsKeyDown(Keys.A))
            {
                Vector3 temp = playerWorld.Translation;
                playerWorld.Translation = Vector3.Zero;
                playerWorld *= Matrix.CreateRotationY(rotationRate * dt);
                playerWorld.Translation = temp;
            }

            if (kbs.IsKeyDown(Keys.D))
            {
                Vector3 temp = playerWorld.Translation;
                playerWorld.Translation = Vector3.Zero;
                playerWorld *= Matrix.CreateRotationY(-rotationRate * dt);
                playerWorld.Translation = temp;
            }
        }

        public void Draw(Camera3rdPerson cam)
        {
            foreach (ModelMesh mm in playerModel.Meshes)
            {
                foreach (BasicEffect bfx in mm.Effects)
                {
                    bfx.View = cam.view;
                    bfx.Projection = cam.proj;
                    bfx.World = playerTransforms[mm.ParentBone.Index] * playerWorld;
                }
                mm.Draw();
            }
        }
    }