Abstract
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.
Highlights
Many methods and strategies have been proposed to improve the efficiency of 3D model transmission
Because the detailed model completely covers the information from the coarse model, the previously transmitted data should be reused rather than directly replaced
To avoid unnecessarily repeated judgments, a grid index was built for each complex 3D building model and used each index space as a unit to determine whether the vertices in each needed to be split further
Summary
Many methods and strategies have been proposed to improve the efficiency of 3D model transmission. The coarse models are successively replaced by the more detailed models Such a strategy reduces the data transmission pressure to a certain extent when interacting with an initial coarse scene. The local local mesh mesh in in each plify each clustering clustering unit unit is is organized organizedinto intoaanode nodetree treewhere where each node includes a vertex and its related triangles, and the building model each node includes a vertex and its related triangles, and the building modelisisfinally reorganized into into aa node node forest All these these data data nodes nodes are are stored stored together togetherininaadatabase, database, transmitted on demand, and used for model reconstruction. Our method can realize view-dependent data transmission model refinement. This This can avoid transmitting unnecessary data under the current viewand model refinement.
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