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Motion and position capture devices are also used. They provide the system with real-time information on the user’s actions and position, as well as their evolution. Sensors can locate the user’s entire body, a part of their body or an object held by the user (Fuchs and Mathieu 2011). Different types of sensors exist: mechanical sensors, electromagnetic sensors and optical sensors.

These sensors allow the virtual environment to react to the user’s actions. For example, the system can detect the user’s head movements and adapt the virtual environment accordingly, as if the user were actually in a place and turned their head to explore it visually.