On Sun, Apr 5, 2020 at 11:04 AM Megidd Git <megidd...@gmail.com> wrote:
> 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° > [...] > Just for clarification: A quaternion does *not* describe a "rotation around point", but just a rotation in 3D. If you want to rotate around a given point, you first have to apply a translation to the origin, then the rotation (which might be given as a quaternion) and then a translation back to the intended rotational centre. Cheers, Rainer -- Software Engineer | Trimble Imaging Division Rotebühlstraße 81 | 70178 Stuttgart | Germany Office +49 711 22881 0 | Fax +49 711 22881 11 http://www.trimble.com/imaging/ | http://www.inpho.de/ Trimble Germany GmbH, Am Prime Parc 11, 65479 Raunheim Eingetragen beim Amtsgericht Darmstadt unter HRB 83893, Geschäftsführer: Rob Reeder, Jürgen Kesper
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