Browsing by Author "Froehlich, Bernd"

Now showing 1 - 4 of 4
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    Configuration Finder: A Tidy Visual Interface for Effective Faceted Search
    (The Eurographics Association, 2020) Riehmann, Patrick; Schädler, Andreas; Harder, Jannis; Herpel, Jakob; Froehlich, Bernd; Kerren, Andreas and Garth, Christoph and Marai, G. Elisabeta
    We present an interactive visualization aiding users in making informed decisions about large product data sets consisting of quantitative and categorical attributes. Our approach tries to overcome common problems between parallel attribute axes, for instance limited horizontal space or clutter, by introducing novel visual concepts such as proxy axes, fusion axes, and hybrids of set-based and individual axis connections. A proxy axis represents a group of semantically related attributes, which can be interactively explored and seamlessly integrated into the display. Fusion axes allow users to reduce the number of axes by merging categorical+categorical or categorical+quantitative attribute axes. Set-based or individual connections between axis pairs are chosen according to the involved attribute types. The pilot study and expert reviews showed that these novel concepts are understood, considered to be very useful and favored over up-to-date webshop interfaces.
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    Efficient Direct Isosurface Rasterization of Scalar Volumes
    (The Eurographics Association and John Wiley & Sons Ltd., 2022) Kreskowski, Adrian; Rendle, Gareth; Froehlich, Bernd; Umetani, Nobuyuki; Wojtan, Chris; Vouga, Etienne
    In this paper we propose a novel and efficient rasterization-based approach for direct rendering of isosurfaces. Our method exploits the capabilities of task and mesh shader pipelines to identify subvolumes containing potentially visible isosurface geometry, and to efficiently extract primitives which are consumed on the fly by the rasterizer. As a result, our approach requires little preprocessing and negligible additional memory. Direct isosurface rasterization is competitive in terms of rendering performance when compared with ray-marching-based approaches, and significantly outperforms them for increasing resolution in most situations. Since our approach is entirely rasterization based, it affords straightforward integration into existing rendering pipelines, while allowing the use of modern graphics hardware features, such as multi-view stereo for efficient rendering of stereoscopic image pairs for geometry-bound applications. Direct isosurface rasterization is suitable for applications where isosurface geometry is highly variable, such as interactive analysis scenarios for static and dynamic data sets that require frequent isovalue adjustment.
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    Short-Contact Touch-Manipulation of Scatterplot Matrices on Wall Displays
    (The Eurographics Association and John Wiley & Sons Ltd., 2020) Riehmann, Patrick; Molina León, Gabriela; Reibert, Joshua; Echtler, Florian; Froehlich, Bernd; Viola, Ivan and Gleicher, Michael and Landesberger von Antburg, Tatiana
    This paper presents a short-contact multitouch vocabulary for interacting with scatterplot matrices (SPLOMs) on wall-sized displays. Fling-based gestures overcome central interaction challenges of such large displays by avoiding long swipes on the typically blunt surfaces, frequent physical navigation by walking for accessing screen areas beyond arm's reach in the horizontal direction and uncomfortable postures for accessing screen areas in the vertical direction. Furthermore, we make use of the display's high resolution and large size by supporting the efficient specification of two-tiered focus + context regions which are consistently propagated across the SPLOM. These techniques are complemented by axis-centered and lasso-based selection techniques for specifying subsets of the data. An expert review as well as a user study confirmed the potential and general usability of our seamlessly integrated multitouch interaction techniques for SPLOMs on large vertical displays.
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    Smooth Transitions Between Parallel Coordinates and Scatter Plots via Polycurve Star Plots
    (© 2023 Eurographics ‐ The European Association for Computer Graphics and John Wiley & Sons Ltd., 2023) Kiesel, Dora; Riehmann, Patrick; Froehlich, Bernd; Hauser, Helwig and Alliez, Pierre
    This paper presents new techniques for seamlessly transitioning between parallel coordinate plots, star plots, and scatter plots. The star plot serves as a mediator visualization between parallel coordinate plots and scatter plots since it uses lines to represent data items as parallel coordinates do and can arrange axes orthogonally as used for scatter plots. The design of the transitions also motivated a new variant of the star plot, the polycurve star plot, that uses curved lines instead of straight ones and has advantages both in terms of space utilization and the detection of clusters. Furthermore, we developed a geometrically motivated method to embed scatter points from a scatter plot into star plots and parallel coordinate plots to track the transition of structural information such as clusters and correlations between the different plot types. The integration of our techniques into an interactive analysis tool for exploring multivariate data demonstrates the advantages and utility of our approach over a multi‐view approach for scatter plots and parallel coordinate plots, which we confirmed in a user study and concrete usage scenarios.