XNA 2D世界在x轴上的反射

Question

I'm trying to reflect my game world on the x-axis. I have a camera, which calculate transform matrix:

        _transform =
                    Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) *                        
                    Matrix.CreateRotationZ(Rotation) *                        
                    Matrix.CreateScale(Zoom) *
                    Matrix.CreateTranslation(new Vector3(_graphicsDevice.Viewport.Width * 0.5f, _graphicsDevice.Viewport.Height * 0.5f, 0));

It works fine, until I put a reflection part:

        _transform = //first try, place here
                    Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) *                        
                    Matrix.CreateRotationZ(Rotation) *                        
                    Matrix.CreateScale(Zoom) *
                    Matrix.CreateReflection(new Plane(Vector3.UnitY, 0)) * //here
                    Matrix.CreateTranslation(new Vector3(_graphicsDevice.Viewport.Width * 0.5f, _graphicsDevice.Viewport.Height * 0.5f, 0));

With that "reflection"

spriteBatch.Begin(SpriteSortMode.BackToFront,
                    BlendState.AlphaBlend,
                    null,
                    null,
                    null,
                    null,
                    Camera.Active.GetTransformation);

draw nothing. Please, help and sorry for my english :)

---

UPD : I have made some tests:

var v = new Vector2(0, 10);
var v2 = Vector2.Transform(v, _transform);

without .CreateReflection v2 = {X:450 Y:370}
with .CreateReflection v2 = {X:450 Y:350} //okay. it's reflected. but, why it dont drawing?

Answer 1

Using a scale with the X negated should do the job:

    _transform = //first try, place here
                Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) *                        
                Matrix.CreateRotationZ(Rotation) *                        
                Matrix.CreateScale(Zoom) *
                Matrix.CreateScale(-1,1,1) * //here
                Matrix.CreateTranslation(new Vector3(_graphicsDevice.Viewport.Width * 0.5f, _graphicsDevice.Viewport.Height * 0.5f, 0));