Interaction Challenges in the Development of a Fire Warden VR Training System using a HMD Topics: 3D Interaction Techniques and Metaphores; Interaction Devices and Immersive Displays; Interactive Systems for Education and Training; Virtual, Augmented and Mixed Reality In Proceedings of the 12th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - Volume 2: VISIGRAPP, 84-91, 2017 , Porto, Portugal