Have a look at the video below that introduces point clouds. Think of it like the smallest parts in materie, atoms. Very interesting! Check out the homepage: Unlimited Detail.
Unlimited Detail is a new technology for making realtime 3D graphics. Unlimited Detail is different from existing 3D graphics systems because it can process unlimited point cloud data in real time, giving the highest level of geometry ever seen. http://unlimiteddetailtechnology.com/