[Interest] Qt3D How to model headlight?

[Volker Enderlein]

Hi,

I insert a light source in a scene (headlight) and connect its position 
to the camera position.

But now, when I use camera->viewAll() the bounding volume of the scene 
is enlarged to include the light position. camera->viewAll() changes the 
camera position. And as the light source is connected to the camera 
position, the bounding volume is enlarged every time I do a 
camera->viewAll().

         auto lightEntity = new Qt3DCore::QEntity(rootEntity());
         auto light = new Qt3DRender::QPointLight(lightEntity);
         light->setColor(QColor::fromRgbF(1.0, 1.0, 1.0));
         light->setIntensity(1.);
         light->setConstantAttenuation(1.);
         light->setLinearAttenuation(0.);
         light->setQuadraticAttenuation(0.);
         lightEntity->addComponent(light);
         auto lightTransform = new Qt3DCore::QTransform(lightEntity);
lightTransform->setTranslation(camera()->position());
         lightEntity->addComponent(lightTransform);

         connect(camera(), SIGNAL(positionChanged(QVector3D)), 
lightTransform, SLOT(setTranslation(QVector3D)));

So the question is: How can I model a headlight that is located at the 
camera position and not included in bounding volume calculation?


Cheers, Volker

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