The movie below provides an insight into the movie to date with sections from both gameplay and sandbox modes to illustrate how the model is edited:
The move from holding the model in a fully functional Geographic Information System, aka ESRI's ArcScene to SketchUp, 3D Max and a finally into the Crysis Sandbox has been interesting. The engine is probably the most powerful on the market today and the speed in which it is possible to work is refreshing.
See our previous post for more movies, including a texture mapped model direct from SketchUp:
Crysis - Importing City Models: St Pauls Cathedral
We will have more updates and a tutorial as soon as the workflow is finalised.