Custom Engine

I will be rolling my own custom engine.

Needs
* Search, routing
* Free-form navigation
* 3D audio output
* 2D mapping output
* GPS recognition

Implementation
* Java
* CityGML4J
* Android Platform
* Possibly C++
* MongoDB

Challenges
* Good 3D audio with effects (requires C++)
* Fast routing
* Variety of searches and ways to handle data
* Reasonably handling huge GML files
* Splitting up landscape
* Interface: supplying info to user (semantic and physical) purely through audio.
* Interface: Touch-screen that is blind friendly
* (These interface problems are partly addressed by my prototype)