3D interaction devices are essential tools todemonstrate the diverse and innovative interaction formsthat virtual and augmented reality (VR and AR) applicationsmay offer. When users interact with a virtual scenario, theinteraction tools need to make them feel that the real worldwhere they are has a connection with the virtual scenariothey are looking at. This is the context of this work, thatbrings the functionality of a laser pointer to a virtualscenario. By means of the implementation of an opticaltracking system, a pen with two markers is tracked and theray generated by the pen's direction is used as a 3D pointerthat intercepts the virtual scenario, through the monitor atthe user's desktop. This experience shows how a physicaldevice, initially designed for 2D interaction may be modeledfor a VR or AR application, where the interaction occurs in3D space.
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