Interesting post (as always) a couple of comments: 1. Vue already offers a form of "Level of Detail" (LOD) moedling with its Procedural Terrains 2. Most LOD systems do not retain multiple versions of a model - instead, the base detailed model is rendered using a phantom approximation when it is viewed from a far distance 3. I love the idea of supporting intelligent GIS formats such as ESRI's SHP format but this is far from a trivial task for e-on or anyone else for that matter to implement.