public void WorldViewOrthographicProjectionTests()
{
var world = new WorldView(1, 1);
Assert.IsTrue(world.EyePosition.Equals(Vector3.UnitZ * 7, 1e-3));
world.CalculateOrthogrphicMatrixOffCenterWithViewspaceHeight(680, 240, -200, 128, 5, 55);
Assert.IsTrue(world.GetScreenPosition(new Vector3(0, 0, 0)).Equals(new Vector2((680 - 200) / 2.0, 240 / 2.0), 1e-3));
Assert.IsTrue(world.GetScreenPosition(new Vector3(128, 64, 0)).Equals(new Vector2(680 - 200, 240), 1e-3));
Assert.IsTrue(world.GetScreenPosition(new Vector3(-128, -64, 0)).Equals(new Vector2(0, 0), 1e-3));
Assert.AreEqual(5, world.NearZ, 1e-3);
Assert.AreEqual(55, world.FarZ, 1e-3);
Assert.AreEqual(128, world.NearPlaneHeightInViewspace, 1e-3);
var ray = world.GetRayForLocalBounds(new Vector2((680 - 200) / 2.0, 240)); // top center
Assert.IsTrue(Vector3.UnitZ.Equals(-ray.directionNormal.GetNormal(), 1e-3));
Assert.IsTrue(new Vector3(0, 64, 2).Equals(ray.origin, 1e-3));
Assert.AreEqual(world.NearPlaneHeightInViewspace, world.GetViewspaceHeightAtPosition(new Vector3(1, 1, -10)), 1e-3);
world.Scale = 3;
Assert.AreEqual(world.NearPlaneHeightInViewspace / 3, world.GetWorldUnitsPerScreenPixelAtPosition(new Vector3(1, 1, (7 - 10) / 3.0)) * 240, 1e-3);
}