# Mixed Reality: A Reconsideration Based on Mixed Objects and Geospatial Modalities
## 6 What's Next? Prospects and Limitations of This Study  
With the conclusion of this study, the prospects, as well as the limitations, become more evident. Having established a basic framework to implement an MR experience, the next step is to focus on and resolve the issues related to misalignments between real (mixed) and virtual objects during syncing of the two worlds. Misalignments may be due to configuration errors and lack of accuracy of the device sensors, but they may also be due to the use of low-quality imagery data during the 3D mapping process. An MR system could also take advantage of the 3D Tiles specification for tilesets, an Open Geospatial Consortium standard [46] for streaming and rendering massive 3D geospatial content, served asynchronously, in tiles and different levels of detail, depending on the position of the end-user in the field. Today's MR experiences are based on near real-time 3D scanning methods when the device used for immersion supports such technologies (LiDAR, Kinect). For the mixed object approach presented in the present study, the prerequisites are the 3D mapping of an area and real objects for interaction with other virtual objects to take place. The combination of the prescanned 3D mapping data of an area with real-time data is expected to contribute to the optimization of immersing MR experiences with the appropriate smart equipment (e.g., Microsoft HoloLens).  
The inclusion of interactivity provisions, such as gesture or voice commands, could enhance the information-related interactivity interfaces e.g., multimodal pop-up widgets or narratives (especially as virtual narrators [47] and digital storytelling become increasingly embedded in MR [48]). The existing linking modalities as described in this paper lay the foundations for a fully interactive experience, which will be more content-rich in terms of information and knowledge provided as well as more appealing with respect to the modalities employed in delivering this content to the users who navigate e.g., a cityscape or a historical site. In other words, the modalities built into the system, which could support a seamless, adaptable, and customized framework that provides information about features of the environment, are something that have not been adequately developed at this stage. This would be invaluable in information-rich spaces, such as heritage sites. The next step for this ongoing research is to move from the innovative linking modalities presented in the MR ecosystem delineated above, to an application that enables its users to enjoy true interactivity modalities that provide not only impressive but also meaningful, insightful, and innovative relation with an environment. This study presents an MR application and its underpinning principles, as well as the conceptual model it introduces, based on more comprehensive linking modalities through geoinformatics, contributing to a more holistic conceptualization of what MR is, and what it can achieve.  
The individual contributions of the authors are (according to CRediT taxonomy): conceptualization, K.E.; methodology, K.E. and T.P.; software, T.P.; validation, S.S.; formal analysis, K.E. and T.P.; investigation, S.S.; resources, T.P.; data curation, T.P.; writing--original draft preparation, K.E. and S.S.; writing--review and editing, S.S. and T.P.; visualization, T.P.; supervision, K.E.; project administration, K.E.; funding acquisition, K.E. All authors have read and agreed to the published version of the manuscript.  
This research has been cofinanced by the European Regional Development Fund of the European Union and Greek national funds through the Operational Program Competitiveness, Entrepreneurship, and Innovation, under the Special Action \"Open Innovation in Culture\" (project code: T6 YBII-00297).  
Data Availability Statement: Data sharing not applicable.  
The authors declare no conflict of interest.