quaternion QML Basic Type
A quaternion type has scalar, x, y and z attributes.
To create a quaternion value, specify it as a "scalar,x,y,z" string, or define the components individually, or compose it with the Qt.quaternion() function.
This basic type is provided by the QtQuick import.
See also QML Basic Types.
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https://doc.qt.io/qt-5.14/qml-quaternion.html