[Test] public void GetScaleAtZ()
{
using (DrawDevice device = new DrawDevice())
{
// We'll check twice the focus distance to make sure orthographic
// scaling is working as expected.
device.FocusDist = DrawDevice.DefaultFocusDist * 2.0f;
device.NearZ = 100;
device.FarZ = 10000;
device.ViewerPos = new Vector3(0, 0, -device.FocusDist);
// Screen space rendering
device.Projection = ProjectionMode.Screen;
Assert.AreEqual(1.0f, device.GetScaleAtZ(0.0f));
Assert.AreEqual(1.0f, device.GetScaleAtZ(1000.0f));
Assert.AreEqual(1.0f, device.GetScaleAtZ(-1000.0f));
Assert.AreEqual(1.0f, device.GetScaleAtZ(10000.0f));
Assert.AreEqual(1.0f, device.GetScaleAtZ(-10000.0f));
// World space rendering with orthographic projection
device.Projection = ProjectionMode.Orthographic;
Assert.AreEqual(2.0f, device.GetScaleAtZ(0.0f));
Assert.AreEqual(2.0f, device.GetScaleAtZ(1000.0f));
Assert.AreEqual(2.0f, device.GetScaleAtZ(-1000.0f));
Assert.AreEqual(2.0f, device.GetScaleAtZ(10000.0f));
Assert.AreEqual(2.0f, device.GetScaleAtZ(-10000.0f));
// World space rendering with perspective projection
device.Projection = ProjectionMode.Perspective;
Assert.AreEqual(1.0f, device.GetScaleAtZ(0.0f));
Assert.AreEqual(0.5f, device.GetScaleAtZ(1000.0f));
Assert.AreEqual(0.25f, device.GetScaleAtZ(3000.0f));
Assert.AreEqual(2.0f, device.GetScaleAtZ(-500.0f));
Assert.AreEqual(4.0f, device.GetScaleAtZ(-750.0f));
Assert.AreEqual(10.0f, device.GetScaleAtZ(-900.0f));
Assert.AreEqual(10.0f, device.GetScaleAtZ(-1000.0f));
Assert.AreEqual(10.0f, device.GetScaleAtZ(-10000.0f));
}
}