Research on Key Technologies for Realistic 3D Modeling of Ancient Buildings

This article takes ancient architecture in Shaanxi Province as the research object. Based on laser 3D scanning technology, the seamless integration of point cloud data and GIS data of individual buildings is completed through unmanned aerial vehicles and RTK, forming a process of spatial data acquisition based on ancient architecture. The key technologies include oblique photography mesh model acquisition, laser point cloud model acquisition, and parameterized 3D model generation. By using dynamic uniform light and color processing to tilt aerial photography images, the color effect of the images is improved, and a high-precision Mesh model is generated using the ContextCapture system. At the same time, scientific and reasonable denoising methods are adopted to process laser point cloud data, ensuring the quality of the point cloud. In model generation, texture compression algorithm is applied to optimize OBJ data, improve texture mapping utilization and model loading efficiency. In the end, the fusion of multi-source data successfully produced real-life 3D models of five ancient buildings, including the Big Wild Goose Pagoda and Bell Tower, providing technical support for the digital protection and dissemination of cultural heritage.