Development of an application for extracting stone boundaries for generating stone wall BIM

Abstract

For the conservation and maintenance of stone walls, it is important to continuously record information such as the shape, boundaries, deterioration, and repair history of individual stones. Therefore, the development of Stone Wall BIM, which manages such information in association with three-dimensional models, is required. However, the delineation of stone boundaries and their conversion into CAD data require specialized processing and manual work, which poses challenges in terms of efficiency and reproducibility in practical applications. In this study, we developed a GUI application that takes a textured three-dimensional mesh model as input and performs stone region segmentation, boundary extraction, and DXF output compatible with 3D CAD software. The proposed application was applied to multiple castle stone wall datasets, including those of Nagoya Castle and Osaka Castle, and it was confirmed that the extracted stone boundaries could be exported as DXF files. The results indicate that the proposed application has the potential to improve the efficiency of drawing work required for creating Stone Wall BIM, enhance reproducibility by recording processing conditions, and provide an operational environment suitable for practical use.