基于Cesium的大规模场景三维瓦片模型优化方法

Optimizing 3D tile models in large-scale scenes based on Cesium

作为目前主流的WebGIS框架之一,Cesium提供了在三维虚拟地球场景中添加各种地理要素的能力。而专为Cesium设计的3D tiles,已成为Web端三维数据可视化和分析的主流规范。虽然3D tiles定义了瓦片的构建标准,但优化瓦片模型以降低三维场景的复杂度仍至关重要。本文引入了一种多要素图层融合技术来优化瓦片模型,并以上海市陆家嘴区域作为案例进行了效果验证。经过瓦片模型优化的陆家嘴场景在渲染效率方面有明显提升:请求次数和渲染时间降低了14%~26%,渲染数据量降低了17%~29%。研究成果可以为降低三维场景的场景复杂度和高效流畅地渲染三维场景提供参考。

Cesium,as one of the mainstream WebGIS frameworks,is able to add rich and diverse geographic elements to a 3D virtual earth scene.3D tiles is specifically defined for Cesium,and is the current mainstream specification for visualizing and analyzing 3D data on the Web side.Although 3D tiles specifies the standards for tile construction,optimization of the tile model should still be considered to prevent the scene complexity of the 3D scene from being too high.In this paper,we propose a tile model optimization method with multi-factor layer fusion,and take Lujiazui,Shanghai as the study area to test and analyze the effect of the optimization method.The Lujiazui scene optimized by the tile model has obvious improvement in rendering efficiency:the number of requests and rendering time are reduced by 14%to 26%,and the amount of rendering data is reduced by 17%to 29%.The research results can provide a reference for reducing the scene complexity of 3D scenes and rendering 3D scenes efficiently and smoothly.