Not sure what that message was about, but CE is an independent application. Its only means of communicating with Vue are via import of Vue terrains (as height maps) and the export of generated cities and models as  .vob files.

So far (after two days of using it) I find the best work-flow is as follows:

• generate the city terrain in Vue and export as 16bit TIFF

• use the material painter in Vue to generate the obstacle map (i.e. where the city should be and not be on the terrain). You can also generate additional maps that can be used to control the distribution of building heights or type.

• Load the heightmap and obstacle map into CE via the city wizard and generate your basic city layout

• optimize and modify as you like

• select all models (and streets if desired) and export

• This generates a .vob file

• Go back to Vue and your original terrain, load the .vob and position it to match the terrain.

Above is a test I did using this work flow. It's just a small city of high risers on a plateau terrain generated in Vue. It uses the buildings from the New York City 2259 example and the elevated road ways from the modern streets example. I modified the materials in Vue to add luminosity to the billboards.

I am still messing with the street lights.

Ciao

TD