So currently, I have been able to make my PCG graph prune based on position to get the following effect using the PCG graph below.
What I am struggling to work out and what I would like hopefully someone to help out with is how I can change this so that it is dense in the middle of the area (ideally from the centre of the spline shape but if not the PCG volume will do) and getting more sparse after a certain distance from said centre.