[Interest] How to select objects with Qt3D? (QMouseHandler question)

Sean Harmer sean.harmer at kdab.com
Wed Jul 6 12:44:43 CEST 2016


the easiest way is to use a QObjectPicker component on your entity. By 
default this uses raycast picking against the bounding sphere of your 
entity's mesh. If this is not precise enough for you, you can enable 
triangle-ray intersection testing by way of the QRenderSettings or you 
can attach your object picker to a child entity with a smaller mesh.



On 06/07/2016 09:26, Edward Moyse wrote:
> Hi all,
> I’m trying to play with Qt3d (in Qt5.7), and I'm struggling with the 
> lack of documentation and/or tutorials (and so I apologise in advance 
> if this is an obvious question).
> What I wanted to test is how easy it is to click in the 3D view and 
> select an object.
> If I understand correctly, I should do this using a QMouseHandler and 
> add this to the entity.
> To test this, I modified the basic shapes example as follows:
> in the initialisation list of SceneModifier I added:
> m_mouseDevice(newQt3DInput::QMouseDevice()),
> m_mouseHandler(newQt3DInput::QMouseHandler())
> and in the rest of the ctor it now looks like:
> m_mouseHandler->setSourceDevice(m_mouseDevice);
> //Sphere
> m_sphereEntity=newQt3DCore::QEntity(m_rootEntity);
> m_sphereEntity->addComponent(sphereMesh);
> m_sphereEntity->addComponent(sphereMaterial);
> m_sphereEntity->addComponent(sphereTransform);
> m_sphereEntity->addComponent(m_mouseHandler);
> //QObject::connect(mouseHandler,SIGNAL(clicked(Qt3DInput::QMouseEvent*)),
> //this,SLOT(clicked(Qt3DInput::QMouseEvent*)));
> QObject::connect(m_mouseHandler,&Qt3DInput::QMouseHandler::clicked,
> this,&SceneModifier::clicked);
> And I also added a new method:
> voidSceneModifier::clicked(Qt3DInput::QMouseEvent*event)
> {
> qDebug()<<"clicked!";
> }
> However the function never gets called - I suspect I’ve missed 
> something very obvious, but if so I’d really appreciate any tips 
> and/or links to anything else to read.
> Cheers,
> Ed
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