Numbered sets of polygons in Paths / Trees

[theRainHarvester]

I was looking for something that could keep track of which Sets of polygons are removed / added from booleans. That way I could do Sets type math for picking created shapes from boolean operations and track them.

I found this (from sourceforge clipper1):
https://sourceforge.net/p/polyclipping/discussion/1148419/thread/36d9d3e62e/#eb9e

Are there any plans in the works?

Thanks! And clipper2 is great!

[philstopford]

As the thread suggests, use the Z callback. If you set the Z value differently on each input polygon, and use the callback to set the Z value to allow you to track the source. I use this approach often myself.