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<p><font size="2"><span style="font-size:10pt;"></span></font>Hi all,</p>
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<p>I have a QtWidget app which I am converting to QtQuick. My app works well with QtWidget but after transitioning to QtQuick I have observed that the whole scene is now left handed: not only the geometry is left handed (the z axis is down when it should be
up - check joined file) but also the TrackballManipulator behavior (e.g. when I pan up with the mouse the scene goes down, and it's the same opposite reaction for rotate).</p>
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<p>I do not understand where this is coming from. I was able to easily put the geometry back right handed using a scale -1 on Z but I should not have to do that and this does not solve the TrackballManipulator behavior.</p>
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<p>I have used <a id="LPlnk708810" href="https://bitbucket.org/leon_manukyan/qtquick2osgitem" class="OWAAutoLink">
https://bitbucket.org/leon_manukyan/qtquick2osgitem</a> as a starting point and my code does the following:</p>
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<p>I have a RendererImpl class, created by an OsgItem and which is responsible for maintaining the osgViewer::Viewer and the osgViewer::GraphicsWindow, here is its init method:</p>
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<div>void RendererImpl::init()<br>
{<br>
m_sceneRoot = new osg::Group();<br>
<br>
m_viewer = new osgViewer::Viewer;<br>
m_viewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);<br>
m_viewer->setSceneData(m_sceneRoot);<br>
m_viewer->setCameraManipulator(new osgGA::TrackballManipulator);<br>
m_viewer->getCameraManipulator()->setHomePosition(osg::Vec3d(4.0, -4.0, 2.0), osg::Vec3d(0.0, 0.0, 1.0), osg::Vec3d(0.0, 0.0, 1.0));<br>
m_viewer->home();<br>
<br>
m_sceneRoot->addChild(setupLight());<br>
m_sceneRoot->addChild(setupGrid(6.0f, 2.0f));<br>
<br>
m_window = new FrameBufferWindow(this);<br>
updateSize();<br>
<br>
osg::Camera* camera = m_viewer->getCamera();<br>
camera->setGraphicsContext( m_window.get() );<br>
<br>
camera->setClearColor( osg::Vec4(0.2, 0.2, 0.6, 1.0) );<br>
}</div>
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<p>And its update method on window size change:</p>
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<div>void RendererImpl::updateSize()<br>
{<br>
m_window->getEventQueue()->windowResize(0, 0, osgItem().width(), osgItem().height() );<br>
m_window->resized(0, 0, osgItem().width(), osgItem().height());<br>
<br>
osg::Camera& camera = *m_viewer->getCamera();<br>
const osg::GraphicsContext::Traits& t = *m_window->getTraits();<br>
camera.setViewport( 0, 0, t.width, t.height );<br>
double aspectRatio = t.height ? (double)t.width / (double)t.height : 1.0;<br>
camera.setProjectionMatrixAsPerspective(30.0f, aspectRatio, 1.0f, 10000.0f );<br>
}</div>
<br>
<p></p>
<p>And I have an item which streams the events to the window, e.g.: <br>
</p>
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<div>void OsgItem::mouseMoveEvent(QMouseEvent *event)<br>
{<br>
m_renderer->m_window->getEventQueue()->mouseMotion(event->x(), event->y());<br>
<br>
update();<br>
}</div>
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<p><br>
</p>
<p>Does anyone have an idea of what is wrong in my code? I have looked for days and I am stuck!</p>
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<p>Thanks,</p>
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<p>Antoine.</p>
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