Generate 3D Triangular Meshes from Spliced Point Clouds with Cloudcompare

The modeling technology of point cloud scanning provides a detailed digital format to preserve records of existing cultural relics. It also provides the possibility of diversified development for the reproduction and application of cultural relics. However, the records of existing buildings involve indoor cultural relics, indoor spaces, and outdoor masses and their roofs. For the different parts and scales of the building, the surveying and mapping of different viewpoint heights require the application of different instruments and scanning methods to obtain different point cloud entities. Thus, they need to be edited, spliced, and processed properly to get all the digital information of the building. The technology can be further applied to the preservation and activation of cultural assets. This research proposes the modeling technology to use a cross-platform and CloudCompare software and to integrate UAV scanning and ground-based LiDAR scanning point clouds with the octree structure and Poisson surface reconstruction calculation abilities. Then, a 3D triangular mesh surface model is generated with indoor space and outdoor volume.