Was bored and searched up "sandbox physics" on YouTube, then i found your video. It's quite nice actually, but i dont think performance would be that great on weak computers. Still, keep up the good work.
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Thanks for showing interest. I'm planning to start working on this again soon, so I hope you can follow the progress with me. I already did a lot of work on it since this project and it's come a long way. It's very fast now, even on weaker CPUs:
https://www.youtube.com/watch?v=Mb7kMhyUe9k