Browsing by Author "Keefe, Daniel F."
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Item BioWIM: A MultiSurface, MultiTouch Interface for Exploratory Visualization of Biomedical Data(2010-10-04) Coffey, Dane; Keefe, Daniel F.This paper presents the BioWIM, a multi-surface, multi-touch interface for exploring visualizations of complex biomedical environments using a semi-immersive virtual reality (VR) display. The BioWIM reinterprets the traditional world-in-miniature (WIM) VR metaphor within the context of navigating visualizations based on medical imaging data and using the unique capabilities provided by coupling a multi-touch table with a stereoscopic display wall. A "Window to the World" metaphor is used to navigate a detailed 3D scene displayed on the vertical surface by manipulating widgets and making touch gestures on top of medical imaging data displayed on the table. The technique supports navigation through complex environments while maintaining context. The results of a controlled user study comparing the BioWIM to a more traditional touch interface demonstrate improvements in accuracy in a compound search and size judgment task when using the BioWIM. An interpretation of these results and discussion of design principles and lessons learned is presented.Item Designing with Your Hands: Using 3D Computer Interfaces and Gesture to Model Organic Subjects(2008-11-13) Keefe, Daniel F.This paper reviews recent advances in human-computer interfaces for 3D free-form modeling using hand-based input and presents new results attained with these methods applied to modeling organic subjects. Recent interactive algorithms, including those utilizing force-feedback devices, have made more controllable hand-based 3D computer input possible. With this advance, 3D modeling tools may now better take advantage of the gestural, immediate input available from our hands. 3D models created with this type of input tend to exhibit a loose, immediate aesthetic that is unusual in computer aided design and photo-realistic computer graphics. This paper presents an analysis of the visual form seen in several works produced with 3D modeling tools in this style. A series of organic modeling subjects, primarily artistic anatomical illustrations of the human form, are explored. The modeling styles utilized are found to be quite similar to those seen in traditional gesture drawings. In particular, a tight physical/kinesthetic connection with the form-maker is evident in the results. This gestural style of computer input appears well suited for modeling organic subjects and for performing spatial design tasks, particularly in early, less precision-oriented stages of design.Item Investigation of Membrane Computing for Generative Computer Graphics(2011-10-10) Wagy, Mark; McDermott, James; Keefe, Daniel F.In order to explore new methods of generative graphics, we have explored the use of the relatively new computing paradigm known as Membrane Computing. Similar to the oft-used technique known as Lindenmeyer Systems (L- Systems), Membrane Computing shows potential as being a more powerful tool for generating graphics.Item Using Virtual Reality Environments for Medical Devices Design(2009-10-07) Konchada, Vamsi; Coffey, Dane; Borazjani, Iman; Sotiropoulos, Fotis; Erdman, Arthur; Interrante, Victoria; Keefe, Daniel F.There is an urgent need for improved design methodologies and tools that give designers meaningful and accurate feedback early in the design process; virtual reality can be used to fill this need. Virtual reality provides a highly engaging environment that allows user to experience and comprehend abstract concepts. It can allow designers to broadly explore the space of potential design alternatives, and to expand the boundaries of complex designs that are possible given today's computer assisted tools. Medical device researchers seek to better understand the complexities of cardiac anatomy, visualize how surrounding structures affect device function and deployment, and ultimately design more effective devices. Virtual representation combines visual graphics, virtual reality applications, finite element analysis based on the architecture of a 3D model. Introducing virtual reality based tools into the process of medical device design can significantly improve the process. We present our initial work aimed at developing new immersive visualization and interactive design tools for improving the medical device design process. Our initial work focuses on developing 3-dimensional visualizations of simulated blood flow through mechanical heart valves. Our goal is to develop 3D user interfaces for refining medical device designs within the context of patient-specific anatomy and simulated flow data.Item Visualizing Ancient Greek Rhetoric in Immersive Virtual Reality(2012-06-13) Kim, Kyungyoon; Jackson, Bret; Thorson, Lauren; Graff, Richard; Rabbani, Azadeh; Johnstone, Christopher L.; Keefe, Daniel F.The goal of this project is to reconstruct ancient Greek rhetorical sites in virtual environments, including simulating architecture, sound, crowds, to better understand how the physical settings structured and constrained the interactions that took place in them. Our work makes use of the large-format, head-tracked stereoscopic display at MSI, and our preliminary results include an immersive visualization of the Thersilion at Megalopolis, a site where speeches were once given to 10,000 people.