Basic Projection & View matrix

Currently writing a camera component for FNA (basically XNA), and can’t for the life of me figure out why my matrix transform isn’t working as expected. This is how I calculate my view & projection matrices:

// projection // WorldSize is something like 16x9, 20x10, etc. Basically the "simulated" world size. // Zoom is just a float to zoom the camera. var left = Zoom * -WorldSize.X / 2; var right = Zoom * WorldSize.X / 2; var bottom = Zoom * -WorldSize.Y / 2; var top = Zoom * WorldSize.Y / 2; const float near = 0; const float far = 100; var projection = Matrix.CreateOrthographicOffCenter(left, right, bottom, top, near, far); 

and

// view // Position is the position of my Camera, e.g. (10, 15), (6.51, 16.612), etc. var position = new Vector3(Position, 0); var target = position + Vector3.Forward; var up = Vector3.Up; var view = Matrix.CreateLookAt(position, target, up);  // Combine them var combined = projection * view; 

This should, by all the sources I’ve checked, double-checked, and triple-checked, be correct. However when I apply this matrix to my batch or effects it doesn’t show anything at all:

// I would expect a white square to be rendered in the middle of the screen. Since WorldSize is // 16x9 I would expect a 1x1 square to be clearly visible. var batch = new SpriteBatch(); batch.begin(/* the rest */, combined); var texture = new Texture2D(Game.GraphicsDevice, 1, 1); texture.SetData(new []{Color.White }); batch.Draw(texture, Vector2.Zero, Color.White); batch.End();  // Also tried just rendering lines, shows nothing var effect = new BasicEffect(graphicsDevice) {     VertexColorEnabled = true,     View = view,     Projection = projection }; effect.CurrentTechnique.Passes[0].Apply(); graphicsDevice.DrawUserPrimitives(PrimitiveType.LineStrip, vertices, 0, vertices.Length - 1); 

I have checked so many sources and they all do exactly like this. I even tried copy+pasting the matrix source code for a Java project I made some time back that I know works, and that didn’t work either so I don’t think the Matrix transforms are to blame. Anyone know what I’m doing wrong?