I’m looking for some kind of framework that can take 2D meshes and create cookie cutter shapes out of them or for making partial cuts for 2D meshes but can’t find any. Does anyone know any that I might be missing?
There seem to be a few that are written in native C++ but I didn’t see any in C#.
You could probably integrate one of the C++ ones as a plugin in Unity. I searched bool 2d library
Similarly, look at code in Inkscape or various 3D-printing “slicer” algorithms, which do a lot of CSG-like operations on 2D slices of a model.