[GeoWeb3DContest] GML + SSR

[Information and updates on Web3D's Rotterdam city data competition]

One idea is to use server-side rendering (SSR) in the following way:
- render GML LOD0, or 1 on the client side in real time, during navigation
- one the viewpoint is pointed where you want it, lift the mousebutton/touch. The client then sends the viewpoint pose to the server. The server renders that viewpoint using LOD3 or 4, and sends back an overlay image. 
- you can then click on the overlay image, The client sends viewpoint, and point of clicking, back to the server
- the server constructs a pickray and picks the LOD3,4 geometry, gets the IDs, looks up info in a database and sends back to the client.

Benefit: client stays 'light', and server does all the heavy work.
- client needs a bit of webgl for rendering LOD0 and/or 1, and for navigating

-Doug