[Test] public void GetWorldPos()
{
using (DrawDevice device = new DrawDevice())
{
Vector2 targetSize = new Vector2(800, 600);
Vector2 viewportCenter = targetSize * 0.5f;
// 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.TargetSize = targetSize;
device.ViewportRect = new Rect(targetSize);
device.ViewerPos = new Vector3(0, 0, -device.FocusDist);
// Screen space rendering
device.Projection = ProjectionMode.Screen;
// 1:1 world coordinate output in all cases
AssertRoughlyEqual(new Vector3(0.0f, 0.0f, 0.0f), device.GetWorldPos(new Vector3(0.0f, 0.0f, 0.0f)));
AssertRoughlyEqual(new Vector3(400.0f, 300.0f, 0.0f), device.GetWorldPos(new Vector3(400.0f, 300.0f, 0.0f)));
AssertRoughlyEqual(new Vector3(800.0f, 600.0f, 0.0f), device.GetWorldPos(new Vector3(800.0f, 600.0f, 0.0f)));
AssertRoughlyEqual(new Vector3(0.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(0.0f, 0.0f, 1000.0f)));
AssertRoughlyEqual(new Vector3(400.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(400.0f, 0.0f, 1000.0f)));
AssertRoughlyEqual(new Vector3(800.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(800.0f, 0.0f, 1000.0f)));
AssertRoughlyEqual(new Vector3(0.0f, 300.0f, 1000.0f), device.GetWorldPos(new Vector3(0.0f, 300.0f, 1000.0f)));
AssertRoughlyEqual(new Vector3(0.0f, 600.0f, 1000.0f), device.GetWorldPos(new Vector3(0.0f, 600.0f, 1000.0f)));
// World space rendering with orthographic projection
device.Projection = ProjectionMode.Orthographic;
// Scaled up 2:1 due to focus distance scaling factor
AssertRoughlyEqual(new Vector3(0.0f, 0.0f, 0.0f), device.GetWorldPos(new Vector3(viewportCenter, 0.0f)));
AssertRoughlyEqual(new Vector3(-200.0f, -150.0f, 0.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(-400.0f, -300.0f), 0.0f)));
AssertRoughlyEqual(new Vector3(200.0f, 150.0f, 0.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(400.0f, 300.0f), 0.0f)));
// No scale changes at other distances
AssertRoughlyEqual(new Vector3(0.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter, 1000.0f)));
AssertRoughlyEqual(new Vector3(-200.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(-400.0f, 0.0f), 1000.0f)));
AssertRoughlyEqual(new Vector3(200.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(400.0f, 0.0f), 1000.0f)));
AssertRoughlyEqual(new Vector3(0.0f, -150.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(0.0f, -300.0f), 1000.0f)));
AssertRoughlyEqual(new Vector3(0.0f, 150.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(0.0f, 300.0f), 1000.0f)));
// World space rendering with perspective projection
device.Projection = ProjectionMode.Perspective;
// 1:1 scaling at focus distance
AssertRoughlyEqual(new Vector3(0.0f, 0.0f, 0.0f), device.GetWorldPos(new Vector3(viewportCenter, 0.0f)));
AssertRoughlyEqual(new Vector3(-400.0f, -300.0f, 0.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(-400.0f, -300.0f), 0.0f)));
AssertRoughlyEqual(new Vector3(400.0f, 300.0f, 0.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(400.0f, 300.0f), 0.0f)));
// Scaled down 1:2 at double the focus distance
AssertRoughlyEqual(new Vector3(0.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter, 1000.0f)));
AssertRoughlyEqual(new Vector3(-400.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(-200.0f, 0.0f), 1000.0f)));
AssertRoughlyEqual(new Vector3(400.0f, 0.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(200.0f, 0.0f), 1000.0f)));
AssertRoughlyEqual(new Vector3(0.0f, -600.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(0.0f, -300.0f), 1000.0f)));
AssertRoughlyEqual(new Vector3(0.0f, 600.0f, 1000.0f), device.GetWorldPos(new Vector3(viewportCenter + new Vector2(0.0f, 300.0f), 1000.0f)));
}
}