Perhaps I should have noted in my initial post that the only spacial data stored at the moment is the star system's (x, y, z) position in the game's coordinate

Perhaps I should have noted in my initial post that the only spacial data stored at the moment is the star system's (x, y, z) position in the game's coordinate system. Unless I'm misunderstanding, there should be nothing to cull from a point (ignoring projections)... right?