How is "alignments3D/pose" encoded?

[leetleyang]

Perhaps this thread may help.

It's time I admit I don't know what Rodrigues vectors are

Forgive this naive question, but I still don’t really understand what cryoSPARC’s pose3D actually represents. I understand that the numbers somehow describe a unique rotation in 3D space, but not what each number is, or how to interpret them compared to, say, RELION’s ZY’Z’’ which I do (theoretically) understand. Does anyone have an intuitive explanation of what these numbers are, or a resource I could learn them from? As I have found is often true, the wikipedia article on the topic is a bit o…

Cheers,
Yang