348 Works

RodMesh: Two-handed 3D Surface Modeling in Virtual Reality

Floor Verhoeven & Olga Sorkine-Hornung
User interfaces for 3D shape modeling in Virtual Reality (VR), unlike basic tasks such as text input and item selection, have been less explored in research so far. Shape modeling in 3D lends itself very well to VR, since the 3D immersion provides the user with richer spatial feedback and depth perception when compared to traditional 2D displays. That said, currently existing 3D modeling applications do not focus on optimizing the modeling interaction techniques for...

VMV 2019: Frontmatter

Hans-Jörg Schulz, Matthias Teschner & Michael Wimmer

Laparoscopic Sigmoidectomy Surgery Training System Using AR Follow-up Experience of Real Human Surgery

Akihiro Terashima, Akinobu Morishima, Kazutaka Obama, Yoshiharu Sakai, Taro Maeda & Hideyuki Ando
In our learning system (OITORE Advance), high learning effect was confirmed by using teaching materials using porcine intestines. However, because the environment inside the abdominal cavity is different between pigs and people, there are scenes with different surgical procedures and surgical skills. Therefore, not all the learned skills are applied in human surgery. Therefore, in this paper we changed teaching materials from pig to human and adjusted the system accordingly.

Do contests improve students skills in Computer Graphics? The case of API8

Jean-Pascal Palus, Farès Belhadj & Jean-Jacques Bourdin
This paper presents a contest designed to improve the skills of students in Computer Graphics. The contest is adapted to the current skills of the students and uses a public graphic library. Students then have to produce a demo, generally a program which presents an animation. The main result presented in this paper is that with an appropriate set of tools, students program interesting demos to participate in the contest and their skills in Computer...

Assembly Retrieval Results Inspection in Immersive Environment

Katia Lupinetti, Bonino Brigida, Franca Giannini & Marina Monti
This poster presents a research aimed at supporting the browsing through the results of an assembly retrieval system by exploiting Virtual Reality technologies. To support the users' understanding during the assessing of the similarities of 3D assembly models, the proposed system exploits the three-dimensionality of the space to locate the retrieved models distributing them according to their dissimilarity to the model used as query. It also allows the users to interact with assemblies through voice...

Simulation and Visualization of Fluid Flows Around Real Objects in Augmented Reality

Xingze Tian & Tobias Günther
The long-term vision of augmented reality is to seamlessly integrate digital content into the real world, which provides new means to make physical processes visible that are usually invisible to the naked eye. One such example is the motion of air around us. With the help of a head-mounted augmented reality device, an interactive air flow simulation and the tracking of real-world objects, we develop a flow visualization tool box in which users interactively explore...

Real-time Particle-based Snow Simulation on the GPU

Prashant Goswami, Christian Markowicz & Ali Hassan
This paper presents a novel real-time particle-based method for simulating snow on the GPU. Our method captures compression and bonding between snow particles, and incorporates the thermodynamics to model the realistic behavior of snow. The presented technique is computationally inexpensive, and is capable of supporting rendering in addition to physics simulation at high frame rates. The method is completely parallel and is implemented using CUDA. High efficiency and its simplicity makes our method an ideal...

Highlight Insert Colormaps: Luminance for Focused Data Analysis

Francesca Samsel, Trinity Overmyer & Paul A. Navrátil
Color provides the primary conduit through which we extract insight from data visualizations. As the dynamic range of data grows, extracting salient features from surrounding context becomes increasingly challenging. Default colormaps provided by visualization software are poorly suited to perform such reductions of visual data. Here we present sets of highlight insert colormaps (HICs) that provide scientists with the means to quickly and easily render a detailed overview of their data, create detailed scans of...

Teaching Computer Graphics Based on a Commercial Product

Gregory Smith & Kelvin Sung
The challenges in designing an introductory Computer Graphics (CG) course include selecting an appropriate and coherent set of topics, keeping up-to-date with the rapidly evolving industry, and aligning with the many students' fascinations that tend to stem from flashy popular media. This paper analyzes and classifies existing introductory CG classes according to their approaches in trading-off between covering foundation algorithms and focusing on application-level knowledge. The paper then observes that many application-level courses challenge students...

Visualizing Transportation Flows with Mode Split using Glyphs

Ignacio Pérez-Messina & Eduardo Graells-Garrido
The increasing trend of using unconventional data in urban planning environments has led to the need for developing systems that can visualize this data. Here we present a visualization for studying commuting flows within a city, with a particular focus on the distribution of mode of transportation usage. Our design, called ModalCell, uses a glyph-based flow map to show a city's flows considering mode split, direction, and distance range. We evaluate ModalCell with a pilot...

Spectral Primary Decomposition for Rendering with sRGB Reflectance

Ian Mallett & Cem Yuksel
Spectral renderers, as-compared to RGB renderers, are able to simulate light transport that is closer to reality, capturing light behavior that is impossible to simulate with any three-primary decomposition. However, spectral rendering requires spectral scene data (e.g. textures and material properties), which is not widely available, severely limiting the practicality of spectral rendering. Unfortunately, producing a physically valid reflectance spectrum from a given sRGB triple has been a challenging problem, and indeed until very recently...

MolFind - Integrated Multi-Selection Schemes for Complex Molecular Structures

Robin Skånberg, Mathieu Linares, Martin Falk, Ingrid Hotz & Anders Ynnerman
Selecting components and observing changes of properties and configurations over time is an important step in the analysis of molecular dynamics (MD) data. In this paper, we present a selection tool combining text-based queries with spatial selection and filtering. Morphological operations facilitate refinement of the selection by growth operators, e.g. across covalent bonds. The combination of different selection paradigms enables flexible and intuitive analysis on different levels of detail and visual depiction of molecular events....

Integrating Visualization Literacy into Computer Graphics Education Using the Example of Dear Data

Andrey Krekhov, Michael Michalski & Jens Krüger
The amount of visual communication we are facing is rapidly increasing, and skills to process, understand, and generate visual representations are in high demand. Especially students focusing on computer graphics and visualization can benefit from a more diverse education on visual literacy, as they often have to work on graphical representations for broad masses after their graduation. Our proposed teaching approach incorporates basic design thinking principles into traditional visualization and graphics education. Our course was...

Defining Hatching in Art

Greg Philbrick & Craig S. Kaplan
We define hatching-a drawing technique-as rigorously as possible. A pure mathematical formulation or even a binary this-or-that definition is unreachable, but useful insights come from driving as close as we can. First we explain hatching's purposes. Then we define hatching as the use of patches: groups of roughly parallel curves that form flexible, simple patterns. After elaborating on this definition's parts, we briefly treat considerations for research in expressive rendering.

Evolutionary Pathlines for Blood Flow Exploration in Cerebral Aneurysms

Benjamin Behrendt, Wito Engelke, Philipp Berg, Oliver Beuing, Bernhard Preim, Ingrid Hotz & Sylvia Saalfeld
Blood flow simulations play an important role for the understanding of vascular diseases, such as aneurysms. However, analysis of the resulting flow patterns, especially comparisons across patient groups, are challenging. Typically, the hemodynamic analysis relies on trial and error inspection of the flow data based on pathline visualizations and surface renderings. Visualizing too many pathlines at once may obstruct interesting features, e.g., embedded vortices, whereas with too little pathlines, particularities such as flow characteristics in...

Distance Field Visualization and 2D Abstraction of Vessel Tree Structures with on-the-fly Parameterization

Nils Lichtenberg, Bastian Krayer, Christian Hansen, Stefan Müller & Kai Lawonn
In this paper, we make contributions to the visualization of vascular structures. Based on skeletal input data, we provide a combined 2D and implicit 3D visualization of vasculature, that is parameterized on-the-fly for illustrative visualization. We use an efficient algorithm that creates a distance field volume from triangles and extend it to handle skeletal tree data. Spheretracing this volume allows to visualize the vasculature in a flexible way, without the need to recompute the volume....

Interactive CPU-based Ray Tracing of Solvent Excluded Surfaces

Tobias Rau, Sebastian Zahn, Michael Krone, Guido Reina & Thomas Ertl
Depictions of molecular surfaces such as the Solvent Excluded Surface (SES) can provide crucial insight into functional molecular properties, such as the molecule's potential to react. The interactive visualization of single and multiple molecule surfaces is essential for the data analysis by domain experts. Nowadays, the SES can be rendered at high frame rates using shader-based ray casting on the GPU. However, rendering large molecules or larger molecule complexes requires large amounts of memory that...

Molecular Sombreros: Abstract Visualization of Binding Sites within Proteins

Karsten Schatz, Michael Krone, Tabea L. Bauer, Valerio Ferrario, Jürgen Pleiss & Thomas Ertl
We present a novel abstract visualization for the binding sites of proteins. Binding sites play an essential role in enzymatic reactions and are, thus, often investigated in structural biology. They are typically located within cavities. The shape and properties of the cavity influence whether and how easily a substrate can reach the active site where the reaction is triggered. Molecular surface visualizations can help to analyze the accessibility of binding sites, but are typically prone...

Hybrid Visualization of Protein-Lipid and Protein-Protein Interaction

Naif Alharbi, Michael Krone, Matthieu Chavent & Robert S. Laramee
In the Molecular Dynamics (MD) visualization literature, different approaches are utilized to study protein-lipid interactions (PLI) and protein-protein interaction (PPI) in decoupled contexts. However, the two types of interaction occur in the same space-time domain. It is beneficial to study the PLI and PPI in a unified context. Nevertheless, the simulation's size, length, and complexity increase the challenge of understanding the dynamic behavior. We propose a novel framework consisting of four linked views, a time-dependent...

The Vitruvian Baby: Interactive Reformation of Fetal Ultrasound Data to a T-Position

Eric Mörth, Renata Georgia Raidou, Ivan Viola & Noeska N. Smit
Three-dimensional (3D) ultrasound imaging and visualization is often used in medical diagnostics, especially in prenatal screening. Screening the development of the fetus is important to assess possible complications early on. State of the art approaches involve taking standardized measurements to compare them with standardized tables. The measurements are taken in a 2D slice view, where precise measurements can be difficult to acquire due to the fetal pose. Performing the analysis in a 3D view would...

HIFUpm: a Visual Environment to Plan and Monitor High Intensity Focused Ultrasound Treatments

Daniela Modena, Davide Bassano, Aaldert Elevelt, Marco Baragona, Peter A. J. Hilbers & Michel A. Westenberg
High Intensity Focused Ultrasound (HIFU) is a non invasive therapeutic method, which has been a subject of interest for the treatment of various kinds of tumors. Despite the numerous advantages, HIFU techniques do not reach the high delivery precision like other therapies (e.g., radiotherapy). For this reason, a correct therapy planning and monitoring in HIFU treatments remains a challenge. We propose HIFUpm, a visual analytics approach which enables the visualization of the HIFU simulation results,...

Robustness Evaluation of CFD Simulations to Mesh Deformation

Alexander Scheid-Rehder, Kai Lawonn & Monique Meuschke
CFD simulations are an increasingly important method for the non-invasive analysis of risk factors for aneurysm rupture. Their robustness, however, has to be examined more thoroughly before clinical use is possible. We present a novel framework that enables robustness evaluation of CFD simulation according to mesh deformation on patient-specific blood vessel geometry. Our tool offers a guided workflow to generate, run, and visualize OpenFOAM simulations, which significantly decreases the usual overhead of CFD simulations with...

Using Position-Based Dynamics for Simulating the Mitral Valve in a Decision Support System

Lars Walczak, Joachim Georgii, Lennart Tautz, Mathias Neugebauer, Isaac Wamala, Simon Sündermann, Volkmar Falk & Anja Hennemuth
In mitral valve interventions, surgeons have to select an optimal combination of techniques for every patient. Especially less experienced physicians would benefit from decision support for this process. To support the visual analysis of the patientspecific valvular dynamics and an in-silico pre-intervention simulation of different therapy options, a real-time simulation of the mitral valve is needed, especially for the use in a time-constrained clinical environment. We develop a simplified model of the mitral valve and...

InkVis: A High-Particle-Count Approach for Visualization of Phase-Contrast Magnetic Resonance Imaging Data

Niels H. L. C. De Hoon, Kai Lawonn, Andrei C. Jalba, Elmar Eisemann & Anna Vilanova
Phase-Contrast Magnetic Resonance Imaging (PC-MRI) measures volumetric and time-varying blood flow data, unsurpassed in quality and completeness. Such blood-flow data have been shown to have the potential to improve both diagnosis and risk assessment of cardiovascular diseases (CVDs) uniquely. Typically PC-MRI data is visualized using stream- or pathlines. However, time-varying aspects of the data, e.g., vortex shedding, breakdown, and formation, are not sufficiently captured by these visualization techniques. Experimental flow visualization techniques introduce a visible...

Medical Animations: A Survey and a Research Agenda

Bernhard Preim & Monique Meuschke
Animation is a potentially powerful instrument to convey complex information with movements, smooth transitions between different states that employ the strong human capabilities to perceive and interpret motion. Animation is a natural choice to display time-dependent data where the dynamic nature of the data is mapped to a kind of video (temporal animation). Clipping planes may be smoothly translated and object transparency adapted to control visibility and further support emphasis of spatial relations, e.g. around...

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