Suppose you have a cellular space like a grid or a quad tree or such. Each cell intersecting a shape (say, a triangle) records relative surface feature (say, a plane) that might be useful for recovering or extrapolating a nearest point on surface. Maybe a cell stores an authoritative surface feature, or maybe it can have several, doesn't really matter for this post.
Then, empty neighbors use that data to generate their own (non-overlapping) relative surface features.
