Quaternion Member Editor component as seen in the Scene Inspector
The QuaternionMemberEditor component is a low-level component for use in editing FloatQ elements as XYZ Euler angles in degrees. It is used, for example, in the ProtoFlux input node for FloatQ values.
This component's behavior is very similar to PrimitiveMemberEditor, but a layer of abstraction exists between the FloatQ field in _target and the text field being driven for each member. This abstraction layer converts to and from Euler angles and quaterion values, which is then used for building a UI to edit quaternions as Euler angles.