在CityEngine中建立场景之后，我们需要对建立好的模型导出（以3ds和obj格式为例）。导出模式可以选择两种：Use file size limit和Create one file per shape。

Use file size limit：将所选模型作为一个obj或3ds文件导出

-Create a scene in CityEngine, we need to establish a good model to export (for example, in 3ds and obj format). Exporting can choose between two modes: Use file size limit and Create one file per shape. Use file size limit: the selected model as an obj or 3ds file export