TiCHPolyU: Polygonal Urban Reconstruction via Tight Convex Hull

With the development of digital urban environments, establishing lightweight models for architectural ensembles has gained significant importance. We propose TiCHPolyU , a polygonal mesh reconstruction method to address this need. The core idea of TiCHPolyU is to construct a tight convex hull from raw architectural input, forming a 2.5 D structure generated from the ground that represents the basic geometry of the model. Building on this structure, TiCHPolyU performs a spatial partition to reconstruct geometric details while preserving manifold compactness. The method produces polygonal meshes with improved geometric consistency and reduced data volume. Compared to traditional solutions, TiCHPolyU provides greater efficiency and practicality without requiring additional feature support.