1. University of Munich, Media Informatics Group, Amalienstraße 17, 80333 Munich, Germany and BMW Group, Research & Technology, Hanauer Straße 46, 80992 Munich, Germany and University of Stuttgart, VIS, Pfaffenwaldring 5a, 70569 Stuttgart, Germany
2. University of Munich, Media Informatics Group, Amalienstraße 17, 80333 Munich, Germany
3. University of Stuttgart, VIS, Pfaffenwaldring 5a, 70569 Stuttgart, Germany