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From Atoms 3.2 you can export your crowds to a USD cache.

You can find the exporter in the Atoms Menu: Atoms > Export > USD Exporter.
Or you can activate it with the shelf button: 

This tool will export:

• The main Usd USD file cache which will reference the mesh and rig assets
• An assets folder. This directory contains an "agentTypes" folder which will include all the skeleton and skin mesh files; a "textures" folder with all the textures used by the agent definition; a "variations" folder with all the variation meshes, materials and textures used by the agent variations.

Asset path: If you want to reuse the asset folder exported from another cache or exported from the variations manager (File→ Save as USD from the variation manager UI), you can pass the path of the asset folder here. Then the exporter generates the main file only, containing only the SkelAnim primitives and reference the assets form this folder.

Output path: Usd USD file output path.