Yes, just use the dot product. Sean
On Wednesday 05 April 2017 14:59:48 Igor Mironchik wrote: > Hi, > > I Googled it and found: > > The cos of angle between vectors is: > |(ax*bx + ay*by + az*bz) > > -------------------------------------------------------- sqrt(ax*ax + > ay*ay + az*az) * sqrt(bx*bx + by*by + bz*bz)| > > 05.04.2017 14:52, Igor Mironchik пишет: > > 05.04.2017 14:45, Igor Mironchik пишет: > >> Hi, > >> > >> 05.04.2017 14:29, Paolo Angelelli пишет: > >>> Just cross N and M to get the vector around which to rotate. > >>> > >>> Then use a QQuaternion to set the rotation in the Qt3DCore::QTransform, > >>> and construct it with fromAxisAndAngle(const QVector3D &axis, float > >>> angle) > >> > >> Ok, I can rotate around the right axis. But what angle should I rotate? > > > > This is my question. > > > >> And how can I calculate new normal to the rotated plane? > > > > I already know it... > > > > I just need to know what angle should I rotate. > > > >>> On Wed, 5 Apr 2017 14:18:56 +0300 > >>> > >>> Igor Mironchik <igor.mironc...@gmail.com> wrote: > >>>> Hello, > >>>> > >>>> Let's say I have two vectors - N (normal vector to plane P1) and M > >>>> (normal vector to plane P2). > >>>> > >>>> How to calculate x, y, z axis rotations angles for plane P2 to make > >>>> plane P2 parallel to P1? > >>>> > >>>> How to calculate x, y, z axis rotations angles for plane P2 to > >>>> rotate it > >>>> around vector N? > >>>> > >>>> Thank you. > >>>> > >>>> And what is the measurement of angle in rotationX() of > >>>> Qt3DCore::QTransform? > >>>> > >>>> I need to calculate angles in this units. > >>>> > >>>> _______________________________________________ > >>>> Interest mailing list > >>>> Interest@qt-project.org > >>>> http://lists.qt-project.org/mailman/listinfo/interest > >>> > >>> _______________________________________________ > >>> Interest mailing list > >>> Interest@qt-project.org > >>> http://lists.qt-project.org/mailman/listinfo/interest -- Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK KDAB (UK) Ltd, a KDAB Group company Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090 Mobile: +44 (0)7545 140604 KDAB - Qt Experts _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
