Is there a node or prebuilt collision shape that works as a singular point? For example, I'm using an Area3D to filter locations of interest around an agent. The locations are simple points in space and don't need an area themselves. Is there a way to make the individual points apparent to the Area3D in get_overlapping_areas or get_overlapping_bodies, or will I need to give them a collision shape as a placeholder? It seems excessive to require a full 3D shape when I only need to determine location in space.