Declarative 3D data in XAML, not touching DirectX directly at all. Viewport3D at the root, then doing the right magic to get the sort order of the objects righ

Declarative 3D data in XAML, not touching DirectX directly at all. Viewport3D at the root, then doing the right magic to get the sort order of the objects right (working around the built-in logic, in other words).