Several methods of tracking the position and orientation of the display and any associated objects or devices have been developed to achieve this. Because the purpose of VR is to emulate perceptions of reality, it is paramount that positional tracking be both accurate and precise so as not to break the illusion of three-dimensional space. In virtual reality (VR), positional tracking detects the precise position of the head-mounted displays, controllers, other objects or body parts within Euclidean space. ĪRTag is supported by the open source Goblin XNA software. A similar technique is being used by NASA's Spacecraft 3D smartphone app as an educational outreach tool. ContentsĪn ARTag appears on the Mars Science Laboratory. It thus addresses two of the key problems in Augmented Reality: viewpoint tracking and virtual object interaction. Once the camera's position is known, a virtual camera can be positioned at the same point, revealing the virtual object at the location of the ARTag.
Like the earlier ARToolKit system, they allow for video tracking capabilities that calculate a camera's position and orientation relative to physical markers in real time. They can be used to facilitate the appearance of virtual objects, games, and animations within the real world. WikiMili ARTag Last updated JComparison of some augmented reality fiducial markers for computer visionĪn ARTag is a fiducial marker system to support augmented reality.