05.04.2017 17:02, Sean Harmer пишет:
On Wednesday 05 April 2017 16:30:52 Igor Mironchik wrote:Hi, 05.04.2017 16:12, Sean Harmer пишет:On Wednesday 05 April 2017 15:55:48 Igor Mironchik wrote:Hello, Can I apply Qt3DCore::QTransform to the QVector3D? How can I calculate new QVector3D if Qt3DCore::QTransform will be applied to it, in other words?The transformation is stored in the matrix property. Pre-multiply your vector by the matrix to get the resulting transformed vector: v' = M vSorry for my question. But what the difference between M v and v M?We treat v as a column vector, so we pre-multiply by the matrix M.
Thank you. Understood.787 <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#_ZmlRK9QVector4DRK10QMatrix4x4> *inline* QVector4D <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#QVector4D> *operator**(/const/ QVector4D <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#QVector4D>& vector, /const/ QMatrix4x4 <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4>& matrix) 788 <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#788> { 789 <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#789> /float/ x, y, z, w; 790 x <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19047x> = vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.x <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1xEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[0][0] + 791 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.y <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1yEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[0][1] + 792 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.z <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1zEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[0][2] + 793 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.w <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1wEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[0][3]; 794 y <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19048y> = vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.x <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1xEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[1][0] + 795 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.y <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1yEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[1][1] + 796 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.z <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1zEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[1][2] + 797 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.w <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1wEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[1][3]; 798 z <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19049z> = vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.x <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1xEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[2][0] + 799 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.y <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1yEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[2][1] + 800 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.z <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1zEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[2][2] + 801 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.w <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1wEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[2][3]; 802 w <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19050w> = vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.x <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1xEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[3][0] + 803 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.y <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1yEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[3][1] + 804 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.z <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1zEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[3][2] + 805 vector <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19045vector>.w <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZNK9QVector4D1wEv>() * matrix <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19046matrix>.m <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#QMatrix4x4::m>[3][3]; 806 *return* QVector4D <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#QVector4D>( <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qvector4d.h.html#_ZN9QVector4DC1Effff>x <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19047x>, y <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19048y>, z <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19049z>, w <https://code.woboq.org/qt5/qtbase/src/gui/math3d/qmatrix4x4.h.html#19050w>);
807 } But why it can be needed in 3D?
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