## 4 Discussion
### Future Research  
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2. Portability of the mixed reality application. Xcode can install the current mixed reality applications onto other Apple(tm) devices (i.e., iPhone, MacBook) without accomplishing any further technical action. Therefore, such implementational versatility could increase the number of users interested in this MR methodology. Furthermore, Blender provides the possibility to export 3D models that reside in memory into diverse formats, not only DAE, without any additional step. Such flexibility permits employing the same 3D models by other software development kits. Similarly, multiple operating systems (i.e., Windows(tm) and Android(tm)) can carry out comparable versions of the current MR application simply by applying slight variations in the code. Hence, such technological portability enables users to operate other types of innovative appliances, allowing stereographic rendering (e.g., smart-glasses by Windows(tm), i.e., Hololens). Nevertheless, these devices can be very costly to a final user. From this perspective, our primary intention was to render the application accessible to a vast public by downloading it to everyday appliances like tablets (iPad) or smartphones (iPhone).
3. Positioning. The excavation could integrate a network of electronic marker-based devices, namely beacon Bluetooth/Wi-Fi gadgets, to strengthen the accuracy in placing the 3D cluster on the profile. From this perspective, any archaeological site, regardless of its extension, could apply such aligning techniques, rendering the present study easily transferable to other types of contexts.
4. Additional valuable information in the original database. It could be valuable to integrate the original excavation database with Supplementary Data such as photographs, analyses, graphics or even digital scans accomplished on the evidence. The MR application could smoothly retrieve such details, improving the information provided to the archaeologist after any given query.
5. Creation of tridimensional distribution maps about a particular group of artefacts. Similarly, it might be useful to include information about significant features concerning each artefact in the excavation database. Such attributes can indicate if the archaeological find seems to be connected to other artefacts (refit) depending on whether it presents evidence of heating or retouch or shows indications of being recycled. With such physical characteristics, the entire process could create 3D distributional clusters by pinpointing the 3D models involved in those allocations. It is worth noting that previous research has, in the case of burnt evidence [30] or artefact refits [31], bidimensionally emphasised such representations. However, the 3D distributions improve the level of comprehension inside the context, providing a filtered panorama about what the archaeologist volumetrically requires to identify over the excavation's lifetime.
6. Generation of tridimensional plaster representing stratigraphic levels. Three-dimensional (3D) meshes of stratigraphic levels (layers), in the manner of tridimensional plasters, are remarkably convenient to visualise the context in which each find is embedded [32]. For reconstructing an approximation of the stratigraphic levels at Les Cottes, we could utilise the geological-level limits (see Tables 1 and 2) associated with the horizontal topographic boundaries to build parallelepipeds that represent the partial volume of every extracted stratigraphic level at a specific moment of the excavation process. The MR application could render such plasters visible on-demand.