## 5 Results and Future Studies
### Discussion  
At present, this study has completed the linking of 3D-GIS macrocosmic information with Unity, integrated historical building models and 3D-GIS attribute data, and can automatically match buildings with the same ID information through the writing of interactive program scripts, in order to facilitate reading and simulating the macro building environment information. Professionals can automatically visualize all the information they need in a Unity scene. This study designed user situations for professionals, meaning interdisciplinary information and the information model can be presented through scene switching, which is in line with the workflow of professionals. Moreover, the platform can update historical building models and data in real time; provided the model and edited text file (CSV) are extracted from the local database system, the information can be automatically updated.  
In addition, as IM Fusion offers the function of VR simulation and an interactive experience with the environment, both professional and nonprofessional users can intuitively operate the platform to conduct restoration surveys, or take it as an object for environmental guidance and spatial experiences in historic buildings. In the research process, this study found many integration problems, which are mainly related to the integration of the database and the model in Unity, which limits the visualization and interactivity of this research. The following outlines the problems and possible solutions:  
1. When an Overlay is tapped to display information in Unity, the Mesh must be touched; however, there is a parent-child relationship in Unity, which makes the Mesh at the bottom of the object. While this study separated the Mesh from the object, the number of 3D old city block models is very large, thus, when there are many complex objects in the scene, and they contain various materials, it takes a lot of time to organize the information model, which cannot reduce the time cost.
2. The research scope of this study is the old city streets around Chi Kan Tower, and the number of buildings is over 3000. As manually importing each information model has the potential for errors, after integration, there is no way for Unity to automatically detect errors.
3. When integrating the model and data, it was found that the cadastral map of the building model and the cadastral map of the geographic information could not be completely consistent due to the different measurement methods, which reduced the accuracy of the longitude and latitude coordinates.  
With the rapid development of technology, we look forward to overcoming the above-mentioned problems and directing this platform to an automated process. All model information and environmental information can be automatically updated due to the sharing of data, so that it can be easily provided to different fields of professionals to conduct analysis and planning.  
Therefore, this research proposes three solutions for the next stage: first, through the programming of a programming language, the object can be automatically sorted and the material of the object itself can be obtained. Second, add triggers to each object so that the back-end administrator can discover problems in time during testing. Third, in response to the problem that different professional fields cannot correspond to the drawing files and data, when a high-detailed single building body is required, we mainly use the data provided by the construction field. In contrast, when a large-scale environmental structure model and urban information model are needed, the quantitative information provided by the geographic information field is the mainstay.