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Rerun is a fantastic tool. I've made my team adopt it to visualise all of our (Rust) inference pipeline, it's been instrumental to improve our system.

I'm very impressed that not only they develop rerun, but they are mostly building the entire UI from scratch through egui. Very serious syndrome of not invented here but the result is astonishing! Their blog also has some very interesting posts on the code.

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Awesome to hear it's working out for you!

What existing UI could they have used?

Emil had already started egui long before we started Rerun. The immediate mode paradigm of egui also fits very well with how we wanted to archetype Rerun. In addition to that the GUI framework story in Rust is still quite immature which means you often need to be able to make changes to the actual GUI framework if you want to create a "cutting edge" UI heavy product in Rust. Not surprisingly you therefore see other Rust based apps build their own GUI frameworks for that same reason. There are some promising initiatives in the Rust world but we'd still make the same decision to build on egui today if we were to start from scratch.

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