Roblox doesn’t store assets as OBJ. They have their own file format. There is a few versions of it so you will have to write (or find someone to write) an exporter to obj.
( Latest Revision: 10/3/2022 )
When a mesh is uploaded to Roblox, it is converted into an in-house format that the game engine can read and efficiently work with. Roblox’s mesh format isn’t a format you can normally export to or import into Roblox Studio, but you can download meshes by their assetId using the assetdelivery API .
This resource aims to be an unofficial spec for interpreting this format, so you might be able to write code externally that can read Roblox mesh files. It is assumed…
Check out these two mesh assets to see the difference between v1 and v3.
https://assetdelivery.roblox.com/v1/asset/?id=1028604
https://assetdelivery.roblox.com/v1/asset/?id=4180344753
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