[Interest] Add extra rotation to a quaternion

[Megidd Git]

Hi!

I have a QQuaternion <https://doc.qt.io/qt-5/qquaternion.html> like:

QQuaternion(scalar:0.707107, vector:(0, 0, 0.707107))

I want to add this extra rotation to my quaternion:

Rotation around point QVector3D(34.5, -40, 7.16294) in XY plane by 180°

I don't know how to convert my extra rotation to quaternion and add it to
my previous quaternion. Can anybody help?

Thanks!
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