First I would like to be clear: this is a noob question, I need a simple answer if such an answer exists.
In a three-dimentional space, how can I name this rotation?
Let's assume X is red, Y is blue, Z is green.
I need to know the direction of the rotation (+ or - 90°) and how can I name it: is it name depending on the Z axis which is the "static" axis of my box, or depending on the Y axis? I need to name this rotation for a physical sculpture documentation project.
I am sorry if I am a bit confused! Thanks for your help.