So it sounds like it's essentially a form of spacial indexing. That just amplifies the problems of space and animation. You not only need space to store each point, you need space to store the index. For stock animation you need a 4 dimensional point cloud and index, for generated animation you need to generate the points and compute the index with each frame.

Now I wouldn't have thought it would be practical to make a spatial index that supports such quick perspective based lookups either so it may be they do have solutions to these problems, but until I get some independent reports including data on storage and animation, I'm going to be skeptical.