Exploiting sensing devices availability in AR/VR deployments to foster engagement. - Nicholas Vretos; Petros Daras; Stylianos Asteriadis; Enrique Hortal; Esam Ghaleb; Evaggelos Spyrou; Helen C. Leligou; Panagiotis Karkazis; Panagiotis Trakadas; Kostantinos Assimakopoulos (Virtual Real., 2019)