I was under the impression that point cloud data didn't store polygon data, but let a sophisticated vector rendering algorithm generate polygons from the point cloud. Like a bitmap holds pixels, but a vector holds lines.
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Nope, they are just points that have their own cordinates and have data that connect them with edges. The same applies to polygonal.
A point cloud is just the term they use for the points that arn't connected yet. They use this in 3d scanning. First they calculate the point cloud and then recalculate the edges.
source here
http://en.wikipedia.org/wiki/Point_cloud
They just say alot of nonsense in that video :/ So I call it a fake!