Can someone please explain the Group ID input in the Index of Nearest node? My current understanding is that it probably is like the "selection" input in extrude or set position node.
The thing is that selection is a pink socket so I'm probably wrong. What is the input that connects to ID socket? I know there's a Set ID node but have never used it so do I use Separate Geometry on a point cloud and use the Set ID node to give it an ID and then use it in Index of Nearest node?
I'm sorry if I was just babbling in the above paragraph but if someone could maybe make a very basic use case to show the method to use these nodes I would be very thankful.