Sand models as used in military are thematic 3D representations of an area of interest which combined the information of maps with a more realistic 3D bird's eye view of the terrain. Sand models have been used for military planning and war gaming for many years as a field expedient, small-scale map, for planning and training of military operations. This, however increasingly fell out of favor with improved maps, aerial and satellite photography, and later, with digital terrain simulations. The proposed system, a Digital Sand Model (DSM) using a Virtual Reality (VR) Workbench, is a digital replica of the same. It involves a leader interacting with the digital environment and other viewers share his view of the digital scene. The system uses a stereoscopic projector, a mirror and Viewing Screen setup to produce a 3D stereoscopic display. This VR system allows performing interactive 3D explorations via stereo camera setup and wearable IR LEDs. A gesture recognition system is also described which allows interaction with the system. The proposed system uses Model-View-Controller (MVC) architecture as the software design.
over the years the techniques and methods that have been used to interact with the computers have evolved significantly. From the primitive use of punch cards to the latest touch screen panels we can see the vast improvement in interaction with the system. The same applies to the projection technology for creating various geometric displays. Researchers are exploring new ways of projection and interaction technologies to create 'illusion' that can reshape our perception and interaction methodologies. In this paper we implemented (Infrared) IR light source tracking system which can be used for tracking single and multiple IR light source positions and can be used effectively in optical tracking problems such as tracking head position which is all pervasive requirement in a Virtual Reality System. We present a method of mapping IR light source position and orientation to an image. We defined the interaction techniques for an image manipulations with the help of fingers such as zoom, tilt/rotate, scale etc. We can extend our tracking capabilities to implement the touch screen feature to commercial applications. The paper illustrates the hardware and software used for implementing IR light source tracking based applications.
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