Welcome



Welcome to the Computer Graphics Group at RWTH Aachen University!

The research and teaching activities at our institute focus on geometry acquisition and processing, on interactive visualization, and on related areas such as computer vision, photo-realistic image synthesis, and ultra high speed multimedia data transmission.

In our projects we are cooperating with various industry companies as well as with academic research groups around the world. Results are published and presented at high-profile conferences and symposia. Additional funding sources, among others, are the Deutsche Forschungsgemeinschaft and the European Union.

News

We have two papers on Quad Meshes and Quad Layouts at SIGGRAPH Asia 2014.

Sept. 15, 2014

gamescom 2014

Our group will be presenting at the "gamescom" fair in Cologne again this year from 8/13/2014 till 8/17/2014. We will give an insight into our activities and inform about possibilities of studying graphics-centered computer science at RWTH Aachen University and how this will prepare (not only) for work in the games industry. Of course, we will also have something to play at our booth. More information

July 24, 2014

We have a paper on Mobile Localization at ECCV 2014.

July 7, 2014

We have a paper on Quad Layout Optimization in Computer Graphics Forum.

June 20, 2014

Zometool Shape Approximation

We have two new publications (TVCG 2014 and GMOD/GMP 2014) on freeform shape approximation using the Zometool system. Please see the project page for more information. UPDATE: Now with Windows binaries (and source code) for a 3D Viewer to interactively view the resulting Zome meshes.

April 25, 2014

3D Model of Aachens Cathedral

In cooperation with the Domkapitel Aachen we constructed an information kiosk, placed in the "Dom-Information". Visitors can interactively explore a 3D Model of Aachens cathedral, which is made from laser scans and photos. A Video showing a flight through the cathedral can be downloaded from here.

April 24, 2014

Recent Publications

Dual Strip Weaving: Interactive Design of Quad Layouts using Elastica Strips

SIGGRAPH Asia 2014

We introduce Dual Strip Weaving, a novel concept for the interactive design of quad layouts, i.e. partitionings of freeform surfaces into quadrilateral patch networks. In contrast to established tools for the design of quad layouts or subdivision base meshes, which are often based on creating individual vertices, edges, and quads, our method takes a more global perspective, operating on a higher level of abstraction: the atomic operation of our method is the creation of an entire cyclic strip, delineating a large number of quad patches at once. The global consistency-preserving nature of this approach reduces demands on the user’s expertise by requiring less advance planning. Efficiency is achieved using a novel method at the heart of our system, which automatically proposes geometrically and topologically suitable strips to the user. Based on this we provide interaction tools to influence the design process to any desired degree and visual guides to support the user in this task.

 

Level-of-Detail Quad Meshing

SIGGRAPH Asia 2014

The most effective and popular tools for obtaining feature aligned quad meshes from triangular input meshes are based on cross field guided parametrization. These methods are incarnations of a conceptual three-step pipeline: (1) cross field computation, (2) field-guided surface parametrization, (3) quad mesh extraction. While in most meshing scenarios the user prescribes a desired target quad size or edge length, this information is typically taken into account from step 2 onwards only, but not in the cross field computation step. This turns into a problem in the presence of small scale geometric or topological features or noise in the input mesh: closely placed singularities are induced in the cross field, which are not properly reproducible by vertices in a quad mesh with the prescribed edge length, causing severe distortions or even failure of the meshing algorithm. We reformulate the construction of cross fields as well as field-guided parametrizations in a scale-aware manner which effectively suppresses densely spaced features and noise of geometric as well as topological kind. Dominant large-scale features are adequately preserved in the output by relying on the unaltered input mesh as the computational domain.

 

Scalable 6-DOF Localization on Mobile Devices

13th European Conference on Computer Vision (ECCV'14)

Recent improvements in image-based localization have produced powerful methods that scale up to the massive 3D models emerging from modern Structure-from-Motion techniques. However, these approaches are too resource intensive to run in real-time, let alone to be implemented on mobile devices. In this paper, we propose to combine the scalability of such a global localization system running on a server with the speed and precision of a local pose tracker on a mobile device. Our approach is both scalable and drift-free by design and eliminates the need for loop closure. We propose two strategies to combine the information provided by local tracking and global localization. We evaluate our system on a large-scale dataset of the historic inner city of Aachen where it achieves interactive framerates at a localization error of less than 50cm while using less than 5MB of memory on the mobile device.

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