XNA spritebatch and primative using different axis with same effect - xna

Question

I am developing a side scroller game using monogame 3.0 (XNA-C#). I am using a TriangleStrip to draw the ground and a spritebatch to draw a fence. I want the fence to be on top of the ground but it seems to be using a different axis (negative instead of positive). In order to align things up I need to flip the fence and use a negative x and y. Both the sprite and the primitive are using the same view matrix and project.
Why is the spritebatch need a negative axis while the primitive is using a positive one when they are using the same matrixes?
protected override void Initialize()
{
viewMatrix = Matrix.CreateLookAt(new Vector3(0, 0, 1), Vector3.Zero, new Vector3(0,1, 0));
projectionMatrix = Matrix.CreateOrthographicOffCenter(0,GraphicsDevice.Viewport.Width,
0, GraphicsDevice.Viewport.Height, 0f, 200f) *Matrix.CreateScale(new Vector3(.5f, .5f, 1f));
GraphicsDevice.RasterizerState.CullMode = CullMode.None;
_groundBasicEffect = new BasicEffect(GraphicsDevice);
_groundBasicEffect.View = viewMatrix;
_groundBasicEffect.Projection = projectionMatrix;
_groundBasicEffect.VertexColorEnabled = true;
_groundBasicEffect.World = world;
_fenceBasicEffect = new BasicEffect(GraphicsDevice);
_fenceBasicEffect.View = Matrix.CreateLookAt(new Vector3(0, 0, 1), Vector3.Zero, new Vector3(0,1, 0));
_fenceBasicEffect.Projection = projectionMatrix;
_fenceBasicEffect.TextureEnabled = true;
_fenceBasicEffect.World = world;
base.Initialize();
}
protected override void LoadContent()
{
_spriteBatch = new SpriteBatch(GraphicsDevice);
fenceTexture = this.Content.Load<Texture2D>(#"Fence1");
vertexData = new VertexPositionColor[8];
vertexData[0] = new VertexPositionColor(new Vector3(0, 0, 0), Color.Black);
vertexData[1] = new VertexPositionColor(new Vector3(0, 400, 0), Color.Black);
vertexData[2] = new VertexPositionColor(new Vector3(200, 0, 0), Color.Black);
vertexData[3] = new VertexPositionColor(new Vector3(200, 400, 0), Color.Black);
vertexData[4] = new VertexPositionColor(new Vector3(300, 0, 0), Color.Black);
vertexData[5] = new VertexPositionColor(new Vector3(300, 430, 0), Color.Black);
vertexData[6] = new VertexPositionColor(new Vector3(1200, 0, 0), Color.Black);
vertexData[7] = new VertexPositionColor(new Vector3(1200, 430, 0), Color.Black);
vertexBuffer = new VertexBuffer(GraphicsDevice, typeof(VertexPositionColor), vertexData.Length, BufferUsage.None);
vertexBuffer.SetData(vertexData);
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.White);
GraphicsDevice.SetVertexBuffer(vertexBuffer);
_groundBasicEffect.CurrentTechnique.Passes[0].Apply();
GraphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleStrip, vertexData, 0, vertexData.Length -2);
_spriteBatch.Begin(0, null, null, null, null, _fenceBasicEffect);
_spriteBatch.Draw(fenceTexture, Vector2.Zero, new Rectangle(0, 0, 1130, 221), Color.White, 0, new Vector2(0, 200), 1, SpriteEffects.None, 0);
_spriteBatch.End();
base.Draw(gameTime);
}
How it looks...
How I expect it to look...
In order to get this look I need to change the Draw of the fence to this...
_spriteBatch.Draw(fenceTexture, Vector2.Zero, new Rectangle(0, 0, 1130, 221), Color.White, 0, new Vector2(0, -400), 1, SpriteEffects.FlipVertically, 0);