Qt3D Animation C++

[Lukadriel]

Hello everyone, I have recently started playing with the Qt Framework 3D Module.
I however was unable to find any good example for animation in C++ most of them being in QML.
I am trying to apply an animation I imported from blender( simple cube translation) using the Qt3d animation exporter blender plugin. I however don't know how to handle it. I tried using a QAnimationClipLoader and a QClipAnimator but to be honest I am going basically blind in this.
Can anyone help me ? Just in case I added the code I used.

#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QBoxLayout>

#include <Qt3DCore>
#include <Qt3DRender>
#include <Qt3DExtras>
#include <Qt3DAnimation>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    //Container window and 3d view
    Qt3DExtras::Qt3DWindow *view = new Qt3DExtras::Qt3DWindow();
    view->defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));
    QWidget *container = QWidget::createWindowContainer(view);
    QSize screenSize = view->screen()->size();
    container->setMinimumSize(QSize(200, 100));
    container->setMaximumSize(screenSize);

    //Main widget
    QWidget *widget = new QWidget;
    QHBoxLayout *hLayout = new QHBoxLayout(widget);
    QVBoxLayout *vLayout = new QVBoxLayout();
    vLayout->setAlignment(Qt::AlignTop);
    hLayout->addWidget(container, 1);
    hLayout->addLayout(vLayout);

    //To control input
    Qt3DInput::QInputAspect *input = new Qt3DInput::QInputAspect;
    view->registerAspect(input);

    // Root entity
    Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();

    // Camera
    Qt3DRender::QCamera *cameraEntity = view->camera();

    cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    cameraEntity->setPosition(QVector3D(0, 0, 20.0f));
    cameraEntity->setUpVector(QVector3D(0, 1, 0));
    cameraEntity->setViewCenter(QVector3D(0, 0, 0));

    //Light
    Qt3DCore::QEntity *lightEntity = new Qt3DCore::QEntity(rootEntity);
    Qt3DRender::QPointLight *light = new Qt3DRender::QPointLight(lightEntity);
    light->setColor("white");
    light->setIntensity(1);
    lightEntity->addComponent(light);
    Qt3DCore::QTransform *lightTransform = new Qt3DCore::QTransform(lightEntity);
    lightTransform->setTranslation(cameraEntity->position());
    lightEntity->addComponent(lightTransform);

    //Load mesh

    Qt3DRender::QMesh *mesh = new Qt3DRender::QMesh();
    mesh->setSource(QUrl::fromLocalFile("Data/Models/Wolf_One_obj.obj"));


    Qt3DCore::QTransform *meshTransform = new Qt3DCore::QTransform();
    meshTransform->setScale(5.f);
    //meshTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 0.0f, 0.0f), 45.0f));
    meshTransform->setTranslation(QVector3D(-5.0f, 4.0f, -1.5));
    Qt3DExtras::QPhongMaterial *wolfMaterial = new Qt3DExtras::QPhongMaterial();
    wolfMaterial->setDiffuse(QColor(QRgb(0xa69929)));

    Qt3DCore::QEntity *meshEntity = new Qt3DCore::QEntity(rootEntity);
    meshEntity->addComponent(mesh);
    meshEntity->addComponent(meshTransform);
    meshEntity->addComponent(wolfMaterial);

    // Sphere shape data
    Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh();
    sphereMesh->setRings(20);
    sphereMesh->setSlices(20);
    sphereMesh->setRadius(2);

    // Sphere mesh transform
    Qt3DCore::QTransform *sphereTransform = new Qt3DCore::QTransform();

    sphereTransform->setScale(1.3f);
    sphereTransform->setTranslation(QVector3D(-5.0f, -4.0f, 0.0f));

    Qt3DExtras::QPhongMaterial *sphereMaterial = new Qt3DExtras::QPhongMaterial();
    sphereMaterial->setDiffuse(QColor(QRgb(0xa69929)));

    //Animation
    Qt3DAnimation::QAnimationClipLoader* m_animationClipLoader = new Qt3DAnimation::QAnimationClipLoader(QUrl::fromLocalFile("Data/Animations/simplemove.json"));
    Qt3DAnimation::QClipAnimator *m_animator = new Qt3DAnimation::QClipAnimator;
    m_animator->setClip(m_animationClipLoader);
    m_animator->setLoopCount(3);
    m_animator->start();


    // Sphere
    Qt3DCore::QEntity* m_sphereEntity = new Qt3DCore::QEntity(rootEntity);
    m_sphereEntity->addComponent(sphereMesh);
    m_sphereEntity->addComponent(sphereMaterial);
    m_sphereEntity->addComponent(sphereTransform);
    m_sphereEntity->addComponent(m_animator);

    // For camera controls
    Qt3DExtras::QFirstPersonCameraController *camController = new Qt3DExtras::QFirstPersonCameraController(rootEntity);
    camController->setCamera(cameraEntity);

    // Set root object of the scene
    view->setRootEntity(rootEntity);


    widget->show();
    widget->resize(1200, 800);

    return a.exec();
}

[Lukadriel]

Hey, I was just wondering if the reason there wasn't any documentation is that nobody uses the c++ version of Qt3d

[SGaist]

Hi and welcome to devnet,

It's rather are more classic problem: the people developing the module are trying to provide as complete a documentation as possible but it also takes a lot of time to create meaningful examples and demos.

I'd recommend bringing this question to the interest mailing list. You'll find there Qt3D's developers/maintainers. This forum is more user oriented.

[Lukadriel]

@SGaist Thank you very much for the answer, I am going to do as you advise

[wrosecrans]

@Lukadriel

Chicken and egg. Not many users of the C++ Qt 3D API's yet, so not as much focus on documenting them first, so not many people can figure out how to use it, so there aren't many users, so C++ Qt3D documentation isn't the top priority, so...

[Lukadriel]

@wrosecrans
Hoping I can get an answer from the mailing list. As soon as I figure it out I will post the solution here.

[Orad]

@Lukadriel Hi, One year passed and still waiting for the proper example. Did they give any tips?