Yes, I'm familiar with that paper. It's very complicated to implement - back when I was researching I didn't encounter any papers by others who had replicated

Yes, I'm familiar with that paper. It's very complicated to implement - back when I was researching I didn't encounter any papers by others who had replicated it, and citations often mentioned its complexity. There are simpler ways to scale RBFs. I did it piecewise, using overlapping subdomains (each with ~200 points, so a small linear system) blended with partition of unity, and it scaled to millions of points in an embarrassingly parallelisable way. Here's a result I've linked on HN before, filling a hole in a point cloud (a small one, ~24000 points): https://imgur.com/a/k6AQi https://imgur.com/a/k6AQi Those course notes have some interesting stuff in them, thanks!