[Interest] [QT3d] Does anyone have any idea how to position a light in C++?

[Oleg Evseev]

I've just tested following in my app instead of directional light sun
entity and this works:


    QEntity *en = new QEntity();

    QPointLight *l = new QPointLight();

    l->setColor("red");

    Qt3DCore::QTransform *t = new Qt3DCore::QTransform();

    t->setTranslation(QVector3D(15.0f, 0.0f, 0.0f));

    en->addComponent(t);

    en->addComponent(l);

    en->setParent(this);

I've tried to add this (my scene main entity) directly in entity
creator and it is still works
(but you could try set parent latter - there was bug in qt 3d relevant
to this lately (before 5.7.0)).

I use almost last commit 5.7.0 from git.


--
Regards, Oleg.


2016-06-11 15:09 GMT+03:00 Pierre Chicoine <pierrechicoine606 at gmail.com>:

> Oleg
>
> Thanks for the reply.
>
> Here's the code I hung off of the root entity. Didn't work. Maybe I'm
> translating from QML improperly. ??
>
>  // parent is the root entity
>
>  Qt3DCore::QEntity * pLightEntity = new Qt3DCore::QEntity(parent); // hang off of root
>
>
>  Qt3DRender::QPointLight * pQPointLight = new Qt3DRender::QPointLight();
>
>  pLightEntity->addComponent(pQPointLight);
>
>  //pQPointLight->setColor(QColor::fromRgbF(1.0, 1.0, 1.0, 1.0));
>
>  //pQPointLight->setIntensity(4);
>
>  //pQPointLight->setEnabled(true);
>
>
>  Qt3DCore::QTransform * pLightQTransform = new Qt3DCore::QTransform();
>
>  pLightEntity->addComponent(pLightQTransform);
>
>  pLightQTransform->setTranslation(QVector3D(0,0,300));
>
>
>
>
> On Sat, Jun 11, 2016 at 4:11 AM, Oleg Evseev <ev.mipt at gmail.com> wrote:
>
>> Create new entity with transform and light components, add this entity to
>> the root entity to light the whole scene. One light with one transform.
>>
>> Run the "lights" example and you'll understand the principle.
>>
>> Or you can "pack" several of such entities (with lights and theirs own
>> transforms) into one entity (and add it to the root entity) with one
>> transform to [strike]rule[/strike] transform them all simultaneously. It's
>> up to you.
>>
>> I've not tested all of this, but this is how it works looking on examples.
>>
>> Regards, Oleg.
>>
>>
>> 2016-06-11 14:01 GMT+03:00 Pierre Chicoine <pierrechicoine606 at gmail.com>:
>>
>>> With a point light, did you mean add a point light and transform to
>>> every entity or to the root entity to light the whole scene with one
>>> transform?
>>>
>>> Thanks for the reply Oleg.
>>> On Jun 11, 2016 3:52 AM, "Oleg Evseev" <ev.mipt at gmail.com> wrote:
>>>
>>>> Do you mean point light?
>>>> Example "lights" is not what are you looking for?
>>>>
>>>> This is in qml but obviously it is not so hard to write it in c++ just
>>>> add components QTransform and QPointLight to the QEntity and it will work
>>>> (I think).
>>>>
>>>> Regards, Oleg.
>>>>
>>>> 2016-06-11 13:43 GMT+03:00 Pierre Chicoine <pierrechicoine606 at gmail.com
>>>> >:
>>>>
>>>>> Am I missing something simple. I can't seem to position a light in QT3D
>>>>> Any ideas anyone?
>>>>>
>>>>> _______________________________________________
>>>>> Interest mailing list
>>>>> Interest at qt-project.org
>>>>> http://lists.qt-project.org/mailman/listinfo/interest
>>>>>
>>>>>
>>>>
>
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