A SceneObject used to render particles. We need to be careful with what we do here, because this object is created for in-engine particles as well as custom scene object particles. With custom particles there's no automatic Simulate, or deletion.. You're completely on your own. This is perhaps a good thing though, it's maybe what you want to happen. To be completely isolated and completely in control. But at the same time maybe it's not and it's something we need to sort out.