Roll and pitch relative to device, yaw relative to earth about fusion

[xioTechnologies]

Fusion uses the ZYX Euler angles sequence with an axes convention selected in the settings, either NWD, ENU, or NED.

It sounds like your enquiry is not about Fusion and you just need clarification on what Euler angles actually are. I suggest you search online. There are countless YouTube videos that do a far better job of explaining Euler angles with animations than I could do in written comments.

[copumpkin]

You're right! I think I was having some issues with my inputs into Fusion which was then producing counterintuitive results which led me to think I was getting the wrong frame of reference. After some tinkering I think it's behaving more in line with how I'd expect now, thanks!