The tileset shows off the requestVolume property of a tile. When the viewer is inside the request volume of the point cloud, the point cloud is rendered.
In addition this sample illustrates loading an external tileset from within the main tileset.json.
When running in Cesium, use the 3d-tiles-proximity branch.
The building model was created by Richard Edwards: http://www.blendswap.com/blends/view/45211
