Hmm, then I don't know. Still, they mustn't have stood still since then and come up with new tricks. I wonder if you could do a kind of quad-tree version where

Hmm, then I don't know. Still, they mustn't have stood still since then and come up with new tricks. I wonder if you could do a kind of quad-tree version where you hone in on the precise seam and minimise recalculations to bubbling new energy up the tree. That might also give a way to weigh global-to-local structure.