| Cesium is an open source 3D earth engine based on WebGL and JavaScript.It can implement web applications with 3D virtual earth as the main scene at the browser end.To facilitate network transmission and browser rendering,Cesium’s R&D team developed 3D Tiles,a data structure that represents massive 3D data.However,the definition of 3D Tiles is very abstract,and its way of describing things lies between the category of 3D models and the category of geographic elements,making it difficult for researchers to understand their meaning objectively and comprehensively.3D Tiles has a very strong compatibility,and the official lacks sufficient explanations for its flexible data structure that makes researchers lack production standards as reference.This and flexible data definition increases the complexity of data parsing and application,which is not conducive to make data production and application consistent.In order to enable researchers to comprehensively and objectively understand the definition of 3D Tiles and unify the data "style" of production and application,this paper makes an in-depth interpretation and analysis to the abstraction and compatibility of 3D Tiles,which is based on the basic principles of the WebGL rendering mechanism and the Cesium earth framework.This article points out the problems in the production and application of 3D Tiles,and puts forward the basic principles for the design of production standards.For the application of displaying 3D building models using 3D Tiles,the data structure of 3D Tiles is designed,and a complete data production and conversion process is formulated considering different data collection methods.At the same time,the key technologies that may be used in production are analyzed and introduced.In the experiment,3D Tiles representing 3D buildings were produced using geographic feature datasets as data sources.The work of this paper provides valuable reference for researchers in data production and application. |
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