Research on 3D System of Urban Architecture Under Virtual Reality Technology and Intelligent Modeling

In this paper, computer intelligent modeling technology is used to study three-dimensional spatial data information. By combining octree with NURBS, a new type of three-dimensional architecture is established. The method is modeled in the form of an octree, and NURBS is used to represent irregular surfaces of geometric shapes. In terms of data storage, extended nodes are used, and hybrid octal tree and octal prefix encoding are used. The data structure of a 3D modeling system based on the hybrid model is presented. Finally, the depth value of the vertex of the detailed structure is determined by using the fine detail structure presented by the building image and its geometric position relationship with the main structure of the rough model of the building. The 3D modeling and visualization system of urban architecture is established in OpenGL environment. Point cloud registration, noise removal, feature line extraction, 3D geometry modeling, and texture-based mapping are discussed. The experimental results show that the proposed method can easily and efficiently reconstruct the building scene in the input image, and has a strong sense of reality.