Browsing by Author "Marreiros, Filipe"
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- Calculating the stereo pairs of a Mirror-Based Augmented Reality SystemPublication . Marreiros, Filipe; Marcos, AdéritoThis paper describes a solution for the calculation of the correct stereo pairs of a Mirror-Based Augmented Reality System (MBARS). To achieve augmentation half-silvered mirrors are applied due to their dual reflection characteristic that allow simultaneous seeing-through of real objects and the viewing of reflected virtual ones. This way it is possible to merge virtual content reflected by the mirror with real objects that the user can see through it. The virtual content can be either generated by a monitor or a projector. In this paper we will only refer to the monitorbased systems. These systems are view dependent, meaning that depending upon the viewer’s position the reflected images have to be recomputed. This is why a Head-Tracking System is needed to supply the current viewer’s position. Also we need to consider the main system components and there location, to correctly compute the stereo pairs. Furthermore we present how the result of the mathematical calculations can be used in combination with commands of the OpenGL API to achieve the desired transformations and to allow interactivity.
- Collaborative multimodal authoring of virtual worldsPublication . Sá, Vítor; Marcos, Adérito; Marreiros, FilipeThis work aims the creation of virtual worlds by working teams with resource to advanced interaction techniques, such as speech commands and gestures, as well as the resource to portable devices. The physical characteristics of virtual reality environments lead us to a different kind of user interfaces. However, we found some usefulness on the classic WIMP paradigm, which we also apply by using a PDA, in order to complement the interaction possibilities. In terms of application description we use the Virtual Reality Modeling Language. One of the main goals is the separation/combination of VRML files in order to allow the work to be cared out individually by the members of the team, and later combine the results to produce the global virtual world.