Ruma VS cgmath-rs

This could in turn lead to Synapse pulling in Ruma as a dependency. Meanwhile, Rust is already a huge part of the Matrix org’s fundamental tech stack, covering encryption, authentication and wysiwyg editing,

I got a 404 there, but this link works for me!

Nice! For ruma we do a very similar thing, but with the endpoint definitions being usable for both client & server side, custom macros to make it all more manageable, and with structs with public fields (#[non_exhaustive] for forwards compat) instead of builders.

Take a look into math libraries, like glam, nalgebra, and cgmath. I've only used these through game engines, though, so I can't offer per-basis reviews/advice.

But I am writing a Vulkan-based game engine and I use https://crates.io/crates/cgmath extensively. It has vector classes, all the math functions I need, and it even supports a version of swizzling if you activate the feature. Maybe this crate can do what you need?

There's also a good crate which you can use to quickly create the required matrices called cgmath: https://crates.io/crates/cgmath

One great thing about Rust is that the library ecosystem is surprisingly mature, especially considering how young the language is (1.0 was released in 2015). C# also has good libraries, but from my experience it's kinda fiddly to use most open source libraries with Unity, at least without modifications. Rust's ecosystem has some excellent libraries that help with game development, such as noise for procedural generation and cgmath for linear algebra.