Levels of Detail.- Validity-Preserving Simplification of Very Complex Polyhedral Solids.- View-Dependent Topology Simplification.- Adaptive tessellation of connected primitives for interactive walkthroughs in complex industrial virtual environments.- Tracking.- An Optical Tracking System for VR/AR-Applications.- The integration of optical and magnetic tracking for multi-user augmented reality.- An Optically Based Direct Manipulation Interface for Human-Computer Interaction in an Augmented World.- Rendering of Virtual Environments.- Improving the Illumination Quality of VRML 97 Walkthrough via Intensive Texture Usage.- Fast Walkthroughs with Image Caches and Ray Casting.- Using Virtual Environments to Enhance Visualization.- Distributed Environments.- Semantic Behaviours in Collaborative Virtual Environments.- A Distributed Device Diagnostics System Utilizing Augmented Reality and 3D Audio.- Texture-based Volume Visualization for Multiple Users on the World Wide Web.- Systems and Applications.- PVR — An Architecture for Portable VR Applications.- Rapid Development of VRML Content via Geometric Programming.- Augmented Reality, the other way around.- Interaction.- Interaction Techniques on the Virtual Workbench.- A General Framework for Cooperative Manipulation in Virtual Environments.- Occlusion in Collaborative Augmented Environments.- Author Index.