Complex 3D building models, because of their huge data volume, almost always result in transmission congestion, which leads to poor user experience. To reduce the real-time transmission pressure, a novel view-dependent progressive transmission method was developed. With this method, only a small amount of transmitted data is necessary to achieve an acceptable rendering effect when the viewpoint changes. The method involves two stages. A preprocessing stage simplifies the building model using a multi-level vertex clustering algorithm. The local mesh in each clustering unit is organized into a node tree where each node includes a vertex and its related triangles. The building model is finally reorganized into a node forest. In the reconstruction stage, all root nodes are transmitted first to build a basic model. Their descendant nodes are then requested and transmitted according to viewpoint information to refine the building model during user interaction. The experimental results show that this method can effectively improve the transmission and reconstruction efficiency of 3D building models.

中文翻译：

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基于视图的3D建筑模型渐进传输方法

复杂的3D建筑模型由于其庞大的数据量，几乎总是会导致传输拥塞，从而导致糟糕的用户体验。为了降低实时传输压力，开发了一种新颖的基于视图的渐进传输方法。利用这种方法，当视点改变时，仅需要少量的传输数据即可达到可接受的渲染效果。该方法包括两个阶段。预处理阶段使用多级顶点聚类算法简化了构建模型。每个聚类单元中的局部网格被组织成一个节点树，其中每个节点包括一个顶点及其相关的三角形。最终将构建模型重组为节点林。在重建阶段，首先传输所有根节点以构建基本模型。然后，根据视点信息请求并传输其后代节点，以在用户交互期间完善建筑模型。实验结果表明，该方法可以有效提高3D建筑模型的传输和重建效率。