Rectangle renderers work.

Demo/Demo.cs

@@ -31,16 +31,13 @@ namespace Demo
         {
             // TODO: Add your initialization logic here
             basicEffect = new BasicEffect(GraphicsDevice);
-            basicEffect.View = Matrix.CreateLookAt(new Vector3(graphics.PreferredBackBufferWidth/2f, graphics.PreferredBackBufferHeight/2f, 1f), Vector3.Forward, Vector3.Up);
-            basicEffect.World = Matrix.Identity;
-            basicEffect.Projection = Matrix.CreateOrthographic(GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height, 0, 1);
             basicEffect.VertexColorEnabled = true;
 
-            vertices = new VertexPositionColor[5];
-            vertices[0] = new VertexPositionColor(new Vector3(5, 5, 0), Color.Red);
-            vertices[1] = new VertexPositionColor(new Vector3(10, 5, 0), Color.Red);
+            vertices = new VertexPositionColor[4];
+            vertices[0] = new VertexPositionColor(new Vector3(0, 0, 0), Color.Red);
+            vertices[1] = new VertexPositionColor(new Vector3(10, 0, 0), Color.Red);
             vertices[2] = new VertexPositionColor(new Vector3(10, 10, 0), Color.Red);
-            vertices[3] = new VertexPositionColor(new Vector3(5, 10, 0), Color.Red);
+            vertices[3] = new VertexPositionColor(new Vector3(0, 10, 0), Color.Red);
             base.Initialize();
         }
 
@@ -52,6 +49,7 @@ namespace Demo
         {
             // Create a new SpriteBatch, which can be used to draw textures.
             spriteBatch = new SpriteBatch(GraphicsDevice);
+            basicEffect.World = Matrix.CreateOrthographicOffCenter(new Rectangle(0, 0, GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height), 0, 1);
 
             // TODO: use this.Content to load your game content here
         }