I have had also some success with the Collada export and import on Blender. So, there is the re-texturing and re-lighting. So far I have been exporting as FBX, using the twinmotion exporter, with the added problem the twinmotion export doesn't bring any lighting information into the model.
But I wonder if other people are using, and what is your workflow from getting the Archicad model into Blender. Even tho Archicad doesn't have a native support for exporting Blender files, Blender 2.8 is proving to be an excellent asset for Architectural Visualization.
