Apr, 2018: Zukunftstag 2018. Two pupils of the Gymnasium Horn came to visit the University of Bremen and created their own website with wordpress.

Apr, 2018: We got invited by KUKA to showcase our demo at the European Robotics Forum 2018 in Tampere, Finland

Feb, 2018: The House of Science, Bremen hosts an exhibition about local scientists and science projects with collaborators around the world. One of the featured exhibits is a demo of our Autonomous Surgical Lamps, developed by Jörn Teuber of the Computer Graphics and Virtual Reality group. The exhibition will be open until the 21st of April (photos).

Feb, 2018: The University of Bremen participates in the opening of a research laboratory in Bangkok.

Nov, 2017: 2017 VRST Best Poster Award Winner. Michael Bonfert, Melina Cahnbley, Inga Lehne, Ralf Morawe, Gabriel Zachmann and Johannes Schöning are winning the award for the poster titled "Augmented Invaders: A Mixed Reality Multiplayer Outdoor Game."

Nov, 2017: Organizers of the French VR conference and trade show Laval Virtual immersed themselves into a variety of different virtual environments where they learned about current projects of the Computer Graphics & Virtual Reality lab at the University of Bremen (full report, in German).

Sep, 2017: Founding Everyday Activity Science and Engineering (EASE). EASE is a interdisciplinary research center at the University of Bremen that investigates everyday activity science & engineering. For more Information click here.

Jun 17, 2017: Haptic and hand tracking demos at the Open Campus 2017.

Feb-Apr 2017: David Vilela (Mechanical Engineering Laboratory, University of Coruna, Spain) visited our lab. He is working on benchmarks to compare different intersection calculation methods in collisions, and also different force models.

Feb 2017: G. Zachmann and J. Teuber visited the Mahidol University in Bangkok, Thailand as part of a delegation from the University of Bremen. The goal of the visit was to foster the cooperation between the two universities and lay ground-work for future colaborations.

Jun 2016: Radio Bremen visited our lab to film the works of the Creative Unit "Intra-Operative Information" for a news magazine on the local TV station. Click here for the film at Radio Bremen. And Click here for the same film on our Website.

May 16, 2016: Patrick Lange was honored with the SIGSIM Best PhD Award at the ACM SIGSIM PADS Conference 2016.

Jun 19-21, 2015: G. Zachmann gives invited talk at the DAAD-Stipendiatentreffen in Bremen, Germany.

Jun 2015: Haptic and hand tracking demos at the Open Campus 2015.

Dec 08-10, 2014: ICAT-EGVE 2014 and EuroVR 2014 conferences at the University of Bremen organized by G. Zachmann.

Sep 25-26, 2014: GI VR/AR 2014 conference at the University of Bremen organized by G. Zachmann.

Sep 24-25, 2014: VRIPHYS 2014 conference at the University of Bremen organized by G. Zachmann .

Feb 4, 2014: G. Zachmann gives invited talk on Interaction Metaphors for Collaborative 3D Environments at Learntec.

Jan 2014: G. Zachmann got invited to be a Member of the Review Panel in the Human Brain Project for the Competitive Call for additional project partners

Nov 2013: Invited Talk at the "Cheffrühstück 2013"

Oct 2013: PhD thesis of Rene Weller published in the Springer Series on Touch and Haptic Systems.

Jun 2013: G. Zachmann participated in the Dagstuhl Seminar Virtual Realities (13241)

Jun 2013: Haptic and hand tracking demos at the Open Campus 2013.

Jun 2013: Invited talk at Symposium für Virtualität und Interaktion 2013 in Heidelberg by Rene Weller.

Apr 2013: Rene Weller was honored with the EuroHaptics Ph.D Award at the IEEE World Haptics Conference 2013.

Jan 2013: Talk at the graduation ceremony of the University of Bremen by Rene Weller.

Oct 2012: Invited Talk by G. Zachmann at the DLR VROOS Workshop Servicing im Weltraum -- Interaktive VR-Technologien zum On-Orbit Servicing in Oberpfaffenhofen, Munich, Germany.

Oct 2012: Daniel Mohr earned his doctorate in the field of vision-based pose estimation.

Sept 2012: G. Zachmann: Keynote Talk at ICEC 2012, 11th International Conference on Entertainment Computing.

Sep 2012: "Best Paper Award" at GI VR/AR Workshop in Düsseldorf.

Sep 2012: Rene Weller earned his doctorate in the field of collision detection.

Aug 2012: GI-VRAR-Calendar 2013 is available!

Hips logo

Hip-Replacement Implantation Preparation Simulator

HIPS is a joint project of University of Bremen (computer graphics and virtual reality), Chemnitz University of Technology (department of mechanical engineering), CAT PRODUCTION GmbH and FAKT Software GmbH that is funded by the VDI/VDE within the Central Innovation Programme for SMEs (ZIM) by German Federal Ministry for Economic Affairs and Energy (BMWi) under the grant KF2039721AK2. This project is partially supported by the Bremen Spatial Cognition Center (BSCC).

Our vision is to enable students of surgery to learn the neccessary skills to perform a hip replacement surgery, called arthroplasty, in a fun, safe and effective virtual reality simulation using haptic feedback or force feedback. Actually, virtual reality is one way to lower training costs, as students don't need to practice on donor hips, or at least not exclusively. We currently focus on a single however very difficult step in the whole procedure, the so called acetabular reaming, where the hip socket is enlarged and cleared of old joint tissue and bone in order to facilitate enough room to fit a prosthetic hip socket.

The difficulty when reaming the hip socket is that the amount of force and the duration with which to ream can only be felt. If the surgeon were to ream too far, he could penetrate and damage the bone, or even worse damage nearby major arteries. Surgeons rate this step in the procedure as the most difficult and studies showed that the successrate is directly correlated to the surgeons experience. However, how do you teach a skill that can not be fully expressed by words or images? The key component in learning this skill is haptics or force feedback.

Consequently, we developed a novel collision detection and force feedback method using inner sphere trees that enables haptic force rendering of high forces with stable continuous behaviour. We use a KUKA LBR iiwa robot to render extremely hard contacts and really high forces (up to 137 N).

For further informations about our new geometric data structure that is based on sphere packings, the "Inner Sphere Trees", please visit our corresponding project page.

We successfully demonstrated a working prototype of an intermediate version of our simulator at the European Robotics Forum 2018 and at IEEE VR 2018.

Demonstration at European Robotics Forum 2018

Demonstration of our simulator at the European Robotics Forum 2018 in Tampere, Finnland. The demo was sponsored by KUKA.

Demonstration at IEEE VR 2018

The setup for our demo, which we also presented at the IEEE VR 2018 in Reutlingen, Germany.

Poster shown at IEEE VR 2018.

The poster we presented at the IEEE VR 2018.

Demonstration in Chemnitz.

Our demo setup while meeting with experienced surgeons to evaluate our simulator in May 2018. We mounted the real surgeon tool to the end-effector of the KUKA iiwa.

Demonstration in Chemnitz.

An actual acetabular reamer mounted to the robot.

Demonstration in Chemnitz.

Surgeon testing our simulator in Chemnitz, May 2018.

Demonstration in Chemnitz.

More people trying the simulator in Chemnitz.



Short movie

Short movie demonstrating our project, with English audio. (Go here for the German audio version)

Short movie (longer cut) (German audio)

Short movie demonstrating our project [German audio].

Orthopedic surgeon trying out the simulator

Orthopedic surgeon testing our application.

Recording of the first working version

Work-in-progress video of our application (with english subtitles).


This work is supported by the VDI/VDE within the Central Innovation Programme for SMEs (ZIM) by German Federal Ministry for Economic Affairs and Energy (BMWi) under the grant KF2039721AK2.