evouga

Yes, there is libigl code for extracting isolines, though it has some issues that as far as I know haven't been fixed: https://github.com/libigl/libigl/issues/1245

The isoline extraction problem has three different settings: ## Real Case ## Given a real-valued discrete function on a mesh (i.e. one number per vertex), and a real number c,...

Right now it's simply public domain. MPL2 sounds reasonable (if I remember to stick the header on all of the files once I have more reliable Internet access ;) )...

I'm also having trouble with this implementation; it is too slow to pass several CSES problems, such as https://cses.fi/problemset/task/1111/ or https://cses.fi/problemset/task/1110.