Export mesh to .obj and .stl format

Hi, my goal is export the mesh to .obj and .stl format, and i foled this sample Sample Playground. But in this case we have only .babylon format. Is possible export to .obj and .stl ? If is possible can you help me ?

Thank you very much.

Yes, we support OBJ and STL export as external contributions to the engine.You can check:
as a sample:

The STL exporter is has an identical API as well:

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Thank you @Drigax !