I haven’t found a solution, on how to get basemaps into CityEngine smart! I don’t know if it’s not normal to export a basemap from ArcGIS, since I haven’t found a solution yet. What I do at this point.
Create my AOI, and cut my DTM to match. Then I’m not able to cut the basemap, so I’m actually using my AOI frame, to create a screenshot. That can not be the best way, and is defiantly not a great result.