3 ms·

Yes, I think it's https://patents.google.com/patent/US4719585A/en https://patents.google.com/patent/US4719585A/en. It appears to be specifically the marching c

Yes, I think it's https://patents.google.com/patent/US4719585A/en https://patents.google.com/patent/US4719585A/en. It appears to be specifically the marching cubes (i.e. 3D) algorithm - this article just describes the marching squares (i.e. 2D) algorithm.

expliced 6y ago
And people got around the patent by using the marching tetrahedra algorithm, which uses tetrahedrons instead of cubes.
rzzzt 6y ago
It did expire in 2005, according to the page.