First-person shooters track the user's viewpoint as he -- well, almost always, he -- races through some kind of maze blasting away at computer-generated foes or at enemy cyberwarriors remotely controlled over a network.
Therefore, from the HP user's viewpoint, it is more advantageous to operate in the CP rather than the CFP.
From the user's viewpoint the SOHN approach results in a very transparent tool for knowledge discovery and prediction purposes.
These graphics must be exactly registered to real objects in the scene and this requires an effective Augmented Reality system to track the user's viewpoint.
In order to reduce rendering cost, it is an efficient stategy that only visible data from a user's viewpoint are loaded and rendered.
Although numerous techniques exist, few have been designed to support the selection of objects in dense target environments, or the selection of objects which are occluded from the user's viewpoint.
The current user's viewpoint for the rendering is taken from a pose prediction algorithm, also online running on the laptop, which is based on the fusion of data from the inertia tracker and the camera, looking at one or more markers in the image.
Basing on this characteristic, therefore, the authoring workspace can be also designed to support the representation of the PBL processes hierarchically, which means each edit space (we call it workspace in the "Characterize PBL and identify technical requirements" section from the user's viewpoint) represents the definition of the upper layer element.
low persistence display – a technique to reduce motion blur/judder as it is perceived within VR by illuminating pixels for a short time only, when they are correctly aligned for the user's viewpoint, and switching them off immediately the viewpoint shifts.
For outdoor applications, a georeferencing based algorithm has been developed using the Global Positioning System (GPS) and magnetic orientation tracking devices [5] to track a user's dynamic viewpoint.
