SeminVR: A WebXR public speaking trainer

Presentation training is an essential method to prepare for talking to an audience. Nevertheless, it is mainly done privately without someone to speak to. Respectively, people primarily train to get confident with their presentation's content but do not prepare themselves for talking to an audience. Therefore, virtual reality presentation trainers have been developed to enhance preparation and allow people to train with a virtual audience. However, those applications are usually created for a single platform only, which restricts their usage to a specific type of virtual reality headset.To counteract this issue and facilitate access to such training applications, we developed our multi-platform presentation trainer, SeminVR. Based on the web standard WebXR, it allows access to our training experience via the web, making it independent from any platform. Since other presentation trainers already showed that preparation with such trainers is beneficial, we had to ensure the same applies to our application. Therefore, we conducted a between-subject study focusing on a qualitative analysis of user experiences with SeminVR. With this study, we mainly tried to identify whether the computational differences between platforms impact our presentation trainer's usefulness. Consequently, we created an evaluation approach utilizing a control group to determine the general effectiveness of our application and compare their results to an experimental group experiencing the trainer on different performing platforms.Our results showed that our presentation trainer was perceived as an effective training method. However, we could identify that performance differences can influence its usefulness in cases where comfort is reduced due to the lagging behavior of the application. Nevertheless, only some experimental group participants had issues with weaker performance. As for the rest, they could blend them out and enjoy training like running on a more computationally powerful platform. Therefore, we believe that SeminVR provides a great training possibility and decide that WebXR offers a good solution for developing multi-platform presentation trainers.