In the video, Joe parents the hand bones to a null for IK purposes.
Before drawing the bones, he positions the null so the bones that will be parented to it will be aligned to that null's orientation.
So far OK.
But my model has it's hands horizontal and Joe's model has it's hands vertical, and not paying attention I ended up with hand bones whose Pitch is where the Heading should be.
I said "So far OK" because I know what I've done wrong and how I should have done it : I should just have adjusted the null's Heading +90°, and should have left the null's Bank as it was, then the bones would have aligned correctly.
Before doing all that positioning over again, I was looking for a way to correct my mistake without having to do it all over. But I guess there's no way to do that. (Maybe there is, but I would'nt know it.)
In my messing with the null and the bones however, and here's what my question is about, I noticed that when I grabbed the null's Pitch on the edit sphere, I expected it to follow the "orange Pitch edit sphere cirkel", but it did not do that!
Instead when rotating the null's Pitch, it rotated along the "dark purple circle of the Heading".
When I rotate the hand bones' Pitch, the rotation does follow the "orange Pitch edit sphere cirkel" as I expected.
In the picture you see the hand bones being rotated on the null's Pitch.L
Viewing from the top I expected the bones to go front and back when Pitching the null, but instead the bones rotated up and down???
If you can make sense of my explanation: could you explain this behaviour to me?