@duerer I agree that quaternions (although they are just an extension of the complex numbers and therefore not that difficult)
are usually explained really bad, mostly talking about a 4 dimensional hypersphere, like that is something we are all familiar with, but you could start here: https://blog.cgcookie.com/forums/topic/conors-blender-progress/
https://blog.cgcookie.com/forums/topic/my-progress-in-blender/”>https://blog.cgcookie.com/forums/topic/hi-where-can-i-find-melvin-mesh/
https://blog.cgcookie.com/forums/topic/conors-blender-progress/
https://blog.cgcookie.com/forums/topic/my-progress-in-blender/
Not the best explanation either, (spoiler. a much beter version is on the way!) but something to at least get a different perspective… (I didn’t re-read them, because I’d probably be too ashamed…)