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Any way to export json file from RUBE simulation?

Thanks!

If you mean from the player view, no. There is a planned feature though, that would let you copy the current state of the world in the player view back to the editor view (or make a new copy I guess, would also need to be possible).
At the moment the player view loads the exact same .json as you get when you export, so a lot of information is lost (the original polygons before decomposition, the names and ids of items etc). It will take a major rearrangement of how the player view works to get the 'copy back' feature implemented. When I do that I also want to make it possible to have scripting in the player view as well... not sure when I will get all this done though sorry

Cool. I look forward to see this feature in the future