glam-rs VS cgmath-rs

You could consider using a template framework instead, like Tera. Glam actually does this to generate Rust code.

If you’re still concerned, we can look at the implementation for to_euler()

I've been polishing glamour, the strongly typed vector math companion to glam. :-)

This crate uses bytemuck to implement a zero-cost strongly typed interface on top of glam.

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.