Integration of background maps into 3-D open Roads Model

Using "open road designer"  and "Open bridge modeler", we completed a 3-D model of an interchange (geometry, corridors, terrain, bridges, etc.).

We tried but could not integrate the backgound maps (Microsoft Bing maps) into our 3-D model.

How can  we do it ?

Is there a training, a document or a video, we could follow ?

Thanks.