Volumetric displays provide interesting opportunities and challenges for 3D interaction and visualization, particularly when used in a highly interactive manner. We explore this area through the design and implementation of techniques for interactive direct manipulation of objects with a 3D volumetric display. Motion tracking of the user's fingers provides for direct gestural interaction with the virtual objects, through manipulations on and around the display's hemispheric enclosure. Our techniques leverage the unique features of volumetric displays, including a 360° viewing volume that enables manipulation from any viewpoint around the display, as well as natural and accurate perception of true depth information in the displayed 3D scene. We demonstrate our techniques within a prototype 3D geometric model building application.

Multi-Finger Gestural Interaction with 3D Volumetric Displays

Realizing 3D Visualization Using Grossed-beam Volumetric Displays.

Drishti: A volume Data Explorer

A software architecture is presented for real-time exploration of volumetric data on PCbased platforms using human computer interface (HCI) technologies ranging from mousekeyboard through to multi-screen virtual reality (VR) display with motion tracking. Voxel datasets in the range of 1 GB to 100 GB are targetted, with data from the Visible Human Project being chosen for system demonstration. The architecture is modular: the base program provides efficient display of intersecting orthogonal planes; separately compiled plugin modules provide more advanced 3-D rendering including surface fitting (SF) and direct volume rendering (DVR). Real-time display is provided using OpenGL. Semi-transparent rendering is correctly supported, through currently fails within regions that contain hybrid SF-DVR rendering. Script interfaces ensure code reusability and allow it to be readily reconfigured for particular HCI operation.

A software architecture for real-time volume data exploration on PC-based platforms

Examples of volume data include medical scanned data such as CT and MRI data, seismic survey data, and computational fluid dynamic (CFD) data, etc. To better understand volumetric datasets, people use computer hardware and software to manipulate the data and generate 2D projections for viewing; this process is called volume visualization. Much research on volume visualization has been focused on
volume rendering (how to render larger sets of data faster with a higher level of realism) or transfer function generation (how to highlight the regions of interest). To help improve the efficiency and efficacy of volume visualization, this research proposed using two different approaches. The first approach is to integrate virtual reality environments (VEs) and human computer interaction (HCI) technologies in
volume visualization applications. The second approach is to use various virtual tools that allow users to directly explore and manipulate the volume data in 3D space. A volume visualization system named VRVolVis (Virtual Reality Volumes Visualization System) has been designed and developed to implement these approaches. Many innovations have been integrated into this system, including a fast
volume rendering engine, an intuitive HCI paradigm tailored for volume visualization in VEs, and 8 innovative geometric tools that can assist users to fully reveal the internal structure of volumetric datasets. The tools are the clipping plane widget, the data slab widget, the volume probing tool, the volume clipping tool, the regional enhancement tool, the virtual light, the volume eraser and restorer, and the shooting
star tool. Two sets of experiments involving 33 participants were conducted, and the experimental results supported the assertion that volume visualization tasks would be performed significant better in VR viewing conditions than Stereo and Conventional conditions, and that using these geometric tools can significantly improve the efficiency and efficacy of the volume visualization process.

Volume Visualization in Projection-Based Virtual Environments: Interaction and Exploration Tools Design and Evaluation

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Volume Visualization in Projection-Based Virtual Environments: Interaction and Exploration Tools Design and Evaluation