# Subtitling 3D VR Content with Limited 6 DoF: Presentation Modes and Guiding Methods
## 6 Conclusions and Future Work  
The use of immersive media is increasing, and needs to be accompanied with appropriate accessibility solutions. This study explored, for the first time, two key requirements for subtitling 3D VR content: presentation modes and the use of guiding methods. The conducted tests showed that _Always-visible_ subtitles are significantly more preferred to classic _Fixed-Positioned_ subtitles. This finding is consistent with the results of recent studies focused on VR360 video [9]. Interestingly, the results showed that the newly proposed _Comic-style_ presentation mode was, in general, very well received, and was the most preferred option in terms of relevant aspects (e.g., integration with the VR content and identification of speakers). This reveals its potential, especially for specific content genres (e.g., gaming and animation) and audience profiles (e.g., young consumers). In addition, the results also proved that the use of guiding methods in 3D VR content, in particular of a 3D arrow as the visual indicator, is beneficial and welcomed by users. This is also in line with the results of previous research works on VR360 video [9]. In general, the obtained results have not only provided insights into the appropriateness and benefits of the proposed and adopted solutions, but also provided valuable feedback for refining them and identifying opportunities/needs for future research. Given the lessons learned and remaining open questions, future work will be targeted at:  
* Exploring the adoption and benefits of hybrid and advanced presentation modes and strategies, based on the dynamic user's and speaker's positions and viewpoints, and on the presented VR scenes. * Exploring the adoption and benefits of Easy-to-Read subtitles [30] in 3D VR scenes and environments, due to identified difficulties in following the subtitles for specific (fast and high-motion) scenes. * Exploring the adoption and benefits of all proposed solutions, including 3D radars as guiding methods, in 3D VR scenarios with 6 DoF--or with significantly less limited 6 DoF--such as gaming and those presented and envisioned in [31]. These future works will also take into account the valuable feedback for refining the proposed implementations. In essence, this work not only provides innovative solutions and valuable insights and recommendations for the community, but additionally paves the way for further research on this topic by identifying further relevant opportunities. Demo video showcasing the proposed and adopted subtitling solutions, as well as some implications of their usage: [[https://www.youtube.com/watch?v=SzastPjzeM](https://www.youtube.com/watch?v=SzastPjzeM)]([https://www.youtube.com/watch?v=[PERSON]](https://www.youtube.com/watch?v=SzastPjzeM)) (accessed on 12 August 2021). All authors have contributed substantially to the presented study. [PERSON] and [PERSON] were involved in all phases, from the problem identification and conceptualization to the validation, analysis and documentation. [PERSON] and [PERSON] were especially involved in the implementation and evaluation phases. All authors have read and agreed to the published version of the manuscript. This work was partially funded by the EU's Horizon 2020 program, under agreement n\({}^{\circ}\) 762111 (VR-Together project). Work by [PERSON] was additionally funded by the Spanish Ministry of Science, Innovation and Universities with a [PERSON]--Incorporacion grant (Ref. IJCI-2017-34611) and with the ALMA Excellence Network (Ref. RED2018-102475-T), and by the Fundacion BBVA with a Leonardo Grant entitled \"Accessibilidad en Medios Innersivos\". The study was conducted according to the guidelines of the EU General Data Protection Regulation (GDPR) Declaration of Helsinki, and approved by the Data Protection Officer of i2 CAT ([https://i2 cat.net/privacy-policy/](https://i2 cat.net/privacy-policy/) accessed on 12 August 2021), prior conducting the tests. Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.