Guido Reina

University of Stuttgart, VISUS, Lecturer and Research Associate

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Mounia Lalmas

University of Glasgow

Dr. Mohd Rusllim Mohamed

Universiti Malaysia Pahang (UMP)

Roderick Murray-Smith

University of Glasgow

Prof Fatai O Aramide

Federal University of Technology Akure

DR.GIRISH JOSHI

VIT University

Paul Cockshott

University of Glasgow

Arun Thirumurugan

University of Chile

Anthony Rennie

The University of Sheffield

CHANDRA S PERUGU

Indian Institute of Science

Taskin Jamal

Ahsanullah University of Science and Technology

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Papers by Guido Reina

Multi-class inverted stippling

ACM Transactions on Graphics

We introduce inverted stippling , a method to mimic an inversion technique used by artists when p... more We introduce inverted stippling , a method to mimic an inversion technique used by artists when performing stippling. To this end, we extend Linde-Buzo-Gray (LBG) stippling to multi-class LBG (MLBG) stippling with multiple layers. MLBG stippling couples the layers stochastically to optimize for per-layer and overall blue-noise properties. We propose a stipple-based filling method to generate solid color backgrounds for inverting areas. Our experiments demonstrate the effectiveness of MLBG in terms of reducing overlapping and intensity accuracy. In addition, we showcase MLBG with color stippling and dynamic multi-class blue-noise sampling, which is possible due to its support for temporal coherence.

Implicit Sphere Shadow Maps

2017 IEEE Pacific Visualization Symposium (PacificVis)

Particle data are commonly visualized by rendering a sphere for each particle. Since interactive ... more Particle data are commonly visualized by rendering a sphere for each particle. Since interactive rendering usually relies on fast local lighting, the spatial arrangement of the spheres is often very hard to perceive. That is, larger functional structures formed by the particles are not easily recognizable. Using global effects such as ambient occlusion or shadows adds important depth cues. In this work, we present Implicit Sphere Shadow Maps (ISSM), an application-tailored approach for large, dynamic particle data sets. This approach can be combined with state-of-the-art object-space ambient occlusion to further emphasize the spatial structure of molecules. We compare our technique against state-of-the-art methods for interactive rendering with respect to image quality and performance.

Spatial Partitioning Strategies for Memory-Efficient Ray Tracing of Particles

2020 IEEE 10th Symposium on Large Data Analysis and Visualization (LDAV)

3D particle data is relevant for a wide range of scientific domains, from molecular dynamics to a... more 3D particle data is relevant for a wide range of scientific domains, from molecular dynamics to astrophysics. Simulations in these domains can produce datasets containing millions or billions of particles and rendering needs to be in high quality and interactive to support the scientists in exploring and understanding the structure of their data. One general baseline approach is to represent particles as spheres and employ ray tracing as a rendering technique. However, ray tracing requires the data to be organized in acceleration data structures like bounding volume hierarchies (BVH) to achieve interactive frame rates. Modern GPUs provide hardware acceleration for traversing such data structures but are more limited in memory than CPUs. In this paper, we evaluate different acceleration data structures for sphere-based datasets, including particle kD trees, with respect to their scalability regarding both memory size and speed, and we analyze how these data structures can benefit from hardware acceleration. We show that a bricking of data results in the most effective BVH, both fast to traverse utilizing hardware acceleration and with a reasonably small memory footprint. Additionally, we present a hybrid acceleration data structure that has negligible memory overhead and still ensures reasonable traversal speed. Based on our results, visualization tools and APIs for the ray tracing can provide overall better performance by adapting to the needs of particle-centric application scenarios.

Just 5 Questions: Toward a Design Framework for Immersive Analytics

Immersive Analytics

We present an initial design framework for immersive analytics based on Brehmer and Munzner’s “Wh... more We present an initial design framework for immersive analytics based on Brehmer and Munzner’s “What-Why-How” data visualisation framework. We extend their framework to take into account Who are the people or teams of people who are going to use the system, and Where is the system to be used and what are the available devices and technology. In addition, the How component is extended to cater for collaboration, multisensory presentation, interaction with an underlying computational model, degree of fidelity and organisation of the workspace around the user. By doing so we provide a framework for understanding immersive analytics research and applications as well as clarifying how immersive analytics differs from traditional data visualisation and visual analytics.

A Framework for the Automatic Analysis and Interactive Exploration of Document Aesthetics. Technical Report April 21, 2016

Modern word processing software and typesetting systems such as TeX enable the quick creation of ... more Modern word processing software and typesetting systems such as TeX enable the quick creation of documents of various kinds. Although the quality of the software packages varies, all can produce aesthetically pleasing documents in terms of layout and type setting. Problems typically originate from the large number of parameters which are exposed to the user. These range from simple settings like typeface, font size and column width to more elaborate ones, such as kerning and leading. Most often default values are modified without grasping the consequences for readability and aesthetic appeal of the resulting document.In this paper, we present a system for interactive visualization and exploration of quantifiable aspects of document aesthetics such as alignment, spacing, gray values, but also of image color harmony. This system also allows for comparative analysis of multiple documents and document versions side-by-side. The documents are rated using an extensible and parameterizable...

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