Augmented Reality and Virtual Reality by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030378691
Publisher: Springer International Publishing

3.4 Experimental Setup and Procedure

At first, participants were informed about possible side effects like motion sickness and that they could abort the participation at any moment. Then, the socio-demographical and the AQ questionnaires were handed out. Subsequently, the contacts of the heart rate sensor were misted and the strap was placed on the participants’ chest. Participants had to wear an elastic motion capture suite and 32 markers with a diameter of 14 mm were placed on reference points. The marker set comprised segments that are required for a plausible movement of the avatar in order to compute spinal, shoulder, elbow, wrist, hip, knee and ankle joints. Nine additional tracking markers were added to ensure a better Automatic Identification of Markers (AIM) by asymmetrical placement and to enable the reconstruction of missing markers. A simple walk was recorded for 30 s to train the AIM model. The motion data was captured with 100 Hz. Afterwards, the first heart rate baseline measurement was recorded while sitting. At the beginning of the immersion, a start-up phase was executed. At first, the avatar was selected by the participants’ gender and the height and weight were entered to compute the position of the shoulder joint by means of a regression method. Then, the participants were led to the starting point and they put on the HMD. Afterwards, a connection to the real-time motion data stream was established, the skeleton was generated and the avatar was calibrated in order to scale it to the participant’s proportions and to position it accordingly. In parallel, the HMD was tracked to align the virtual camera with the viewing direction in the global coordinate system. The same was done for the wooden platform in order to align the virtual plank. Additionally, the connection to the heart rate sensor was established.

Each participant started with a training phase lasting for about two minutes. They had to accommodate to instruments and to learn how to look around and to move within the lobby scene. After that, the participants took off the HMD and filled the SSQ to preclude motion sickness. In a short intermission the participants were informed that the investigator will instruct them by microphone during the exposure, but that they can explore the VE freely. They were led to the starting point and put on the HMD again. Now, the second baseline measurement was recorded. Eventually, the virtual height exposure started. The participants positioned themselves in the centre of the elevator while they were instructed not to exit the elevator. Nevertheless, they could still look around and move. The elevator ride was started and the participants travelled to the rooftop of the high-rise building. As they reached it, they were instructed to move to the virtual plank and to enter it. After entering, they were instructed to move to the centre of the plank and to look over the right edge down into the abyss. Then, they were instructed to lift one of their feet over the abyss (see Fig. 3). In parallel, the investigator noted the participants’ behaviour.

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