Hi matthias,
Sorry to bring this topic back up, but I too am having issues with projecting in to Google earth. I have exported my scene using the presets at the top, but when I open it in Google earth all the data seems to be off by around 20/30m. My City engine scene is currently in British National Grid, do I need to change it to WGS84 before adding my rule files and then export it as a KML file?
Thanks,
Jamie