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) visit our Workgroup from February to April. His main work is 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 visits 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: Dissertation 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!



A GPU-Assisted Prototype Guided Sphere Packing Algorithm for Arbitrary Objects

We present a new algorithm that is able to efficiently compute a space filling sphere packing for arbitrary objects. It is independent of the object's representation (polygonal, NURBS, CSG,...); the only precondition is that it must be possible to compute the distance from any point to the surface of the object. Moreover, our algorithm is not restricted to 3D but can be easily extended to higher dimensions.

The basic idea is very simple and related to prototype based approaches known from machine learning. This approach directly leads to a parallel algorithm that we have implemented using CUDA. As a byproduct, our algorithm yields an approximation of the object's medial axis that has applications ranging from path-planning to surface reconstruction.

Sphere packings have proven to be very efficient when doing collision detection, which was the starting point of our research.

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

Dragon MedialAxis

A model of a dragon filled with 5000 spheres (left). As a side effect of our algorithm, we get an approximation of the medial axis in the first iteration (right).


Videos on Youtube

Visualization of our Algorithm

This work was partially supported by DFG grant ZA292/1-1 and the research project, funded by the Federal Minstry of Education and Research (BMBF) grant Avilus / 01 IM 08 001 U.