Three-dimensional city model rendering method and device

Abstract

The present invention provides a three-dimensional city model rendering method and device. The method includes: setting a preset range model, and constructing a quadtree index based on the preset range model according to the bounding box and rendering level of each three-dimensional city model included in the preset range model. Obtain the model subset according to the current viewpoint position and the quadtree index, process the model subset and update it to the scene tree, and set the corresponding visible distance for each model loading type of each model according to the rendering level of each model. . Traverse each node of the scene tree, select the model loading type that satisfies the loading conditions according to the current viewpoint distance, and load and render the model corresponding to the current node. Therefore, taking advantage of the high query efficiency of the quadtree and considering the complexity of the model, the important 3D city model can be loaded first, and the secondary model can be loaded later. The model loading sequence is more in line with human visual habits, and the model rendering High efficiency and good rendering fluency.

Description

technical field [0001] The present invention relates to the technical field of three-dimensional models, in particular to a method and device for rendering a three-dimensional city model. Background technique [0002] With the rapid development of traditional surveying and mapping industry technology, the application fields of 3D digital city models are becoming wider and wider, and have developed from the roaming browsing of a single community or small scene to the 3D application of the entire city. With the continuous improvement of technology, the accuracy of the model and the simulation degree of the model have been greatly improved. However, the improvement of the accuracy and the degree of simulation has also brought about a problem: the dramatic increase in the amount of data. The number of urban building models in the 3D digital city scene is huge and the structure is complex. In real-time scene rendering, it is unrealistic to load all the city models into the comput...

AI Technical Summary

Problems solved by technology

With the continuous improvement of technology, the model accuracy and model simulation degree have been greatly improved. However, the improvement of accuracy and simulation degree has also brought about a problem: the dramatic increase in the amount of data

[0004] However, the existing quadtree construction method is only based on the visual distance for rendering and loading, without considering the complexity of the city model, the loading method is not flexible enough, some important city models cannot be loaded first, and the waiting time for loading is longer

Moreover, some models cannot even be loaded and rendered due to poor viewing distance

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