基于Cesium的海量3DMax模型的加载方法

Method for Loading Massive 3DMax Model Based on Cesium

在GIS行业,一个城市的建筑模型可达几百万个甚至更多,这使得浏览器无力承受。因此,使用LOD技术就成为了必经之路。由于Cesium只支持由WebGL标准的制定组织(Khronos)新发布的数据格式Gltf,但现在大部份的虚拟城市使用的模型都是3DMax模型,再者没有现成的制作工具把3DMax模型制作成Gltf,且三维的LOD比二维的LOD更为复杂,使得绝大部分Cesium的使用者都无法用LOD的方式加载海量3DMax模型数据。本文通过自主开发软件,采用不完全四叉树形式组织瓦片,将海量的3DMax模型制作成Cesium可以支持的3Dtiles切片数据,以实现在浏览器端的3DGIS系统中加载海量3DMax模型。

One city’s building model can reach millions or more,which makes the browser unbearable,in the GIS industry.Therefore,the use of LOD technology has become the only way to go.Since Cesium only supports the new data format Gltf which is newly published by the WebGL standard setting organization(Khronos),one hand,most of the models used in virtual cities are3Dmax models.,the other hand,no mature tool to transform the3Dmax model into Gltf,and the3D LOD is more complex than the2D LOD,so most of the Cesium users unable to load the massive3Dmax model data in the LOD way.In this paper,through independent development software,the massive3Dmax model is transformed into3Dtiles slice data that can be supported by Cesium,so as to load the massive3Dmax model in the3DGIS system of the browser.