10.6 million LiDAR points, and none of them were downloaded

The source is an 81 MB COPC — a LAZ file whose chunks are laid out as an octree with the index stored inside the file. The plate never fetches the file. It reads the header, reads the hierarchy page, and from there issues HTTP range requests for the octree nodes the camera can see, at the depth the screen can actually resolve. Every point on the canvas came out of the LASzip arithmetic decoder (laz-perf, WASM) in this tab, and the 36-byte LAS records go straight into one interleaved buffer, so RGB, ASPRS class and elevation are three uniforms rather than three uploads. Zoom into the stadium roof and watch Spacing fall: the walk descends only where the pixels pay for it.