Unsolved how to convert the Screen coordinates to World coordinates?
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QMatrix4x4 m;
m.setToIdentity();
QMatrix4x4 pro = objmgr.m_camera->projectionMatrix();
QMatrix4x4 vi = objmgr.m_camera->viewMatrix();
QRectF rc;
vi.viewport(rc);
QMatrix4x4 vp = provim;
QVector3D PT = QVector3D(200, 2330,500);
QVector3D SRCP = PT*vp;
but the SRCP is too small just z=0.003,x and y always keep 0