Abstract: To address the problems of large computation and low rendering efficiency in real-time rendering of the interior spaces of large-scale building information models, this paper proposes an adaptive perspective map generation method for lightweight visualization. The method reconstructs the solid parts of indoor scenes by integrating the spatial and semantic information of part divisions. It also designs a projection plane calculation method with visibility constraints to determine the texture projection plane, which better generates the plane texture map of each division space and maintains the three-dimensional sense of furniture parts. Finally, the plane textures are stitched together to obtain a perspective map similar to the original model interior. Through a design experiment, the real-time rendering efficiency and visualization effect of the perspective mapping were compared with the original model in the interior landscape of the building. The results show that the proposed method can achieve a visual experience similar to the original model while significantly reducing resource consumption, and can provide effective technical support for lightweight visualization and high-fidelity rendering of city-level BIM data.

Key words: BIM, interior mapping, lightweight visualization, interior perspective mapping, texture mapping