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#include <QGuiApplication>
#include <QPropertyAnimation>

#include <Qt3DInput/QInputAspect>

#include <Qt3DRender/qcamera.h>
#include <Qt3DExtras/qcylindermesh.h>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DExtras/QMorphPhongMaterial>
#include <Qt3DAnimation/QVertexBlendAnimation>
#include <Qt3DAnimation/QMorphTarget>
#include <Qt3DExtras/QCylinderGeometry>

#include <Qt3DCore/qentity.h>
#include <Qt3DCore/qtransform.h>
#include <Qt3DCore/qaspectengine.h>

#include <Qt3DExtras/qt3dwindow.h>
#include <Qt3DExtras/QForwardRenderer>
#include <Qt3DExtras/qfirstpersoncameracontroller.h>

int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);
    Qt3DExtras::Qt3DWindow view;

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

    // Camera
    Qt3DRender::QCamera *camera = view.camera();
    camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    camera->setPosition(QVector3D(0, 2, 20.0f));
    camera->setUpVector(QVector3D(0, 1, 0));
    camera->setViewCenter(QVector3D(0, 0, 0));

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

    view.defaultFrameGraph()->setCamera(camera);
    view.defaultFrameGraph()->setClearColor(Qt::gray);

    // Transform for mesh
    Qt3DCore::QTransform *transform = new Qt3DCore::QTransform;
    transform->setTranslation(QVector3D(0,-1,-1));

    // Base mesh to morph
    Qt3DExtras::QCylinderMesh *mesh = new Qt3DExtras::QCylinderMesh(rootEntity);
    mesh->setRings(6);
    mesh->setSlices(20);

    // create morh targets from geometry
    Qt3DExtras::QCylinderGeometry *cylinder1 = new Qt3DExtras::QCylinderGeometry(rootEntity);
    Qt3DExtras::QCylinderGeometry *cylinder2 = new Qt3DExtras::QCylinderGeometry(rootEntity);
    Qt3DExtras::QCylinderGeometry *cylinder3 = new Qt3DExtras::QCylinderGeometry(rootEntity);

    cylinder1->setRings(6);
    cylinder1->setSlices(20);
    cylinder1->setLength(2.0f);
    cylinder1->setRadius(1.0f);

    cylinder2->setRings(6);
    cylinder2->setSlices(20);
    cylinder2->setLength(1.0f);
    cylinder2->setRadius(5.0f);

    cylinder3->setRings(6);
    cylinder3->setSlices(20);
    cylinder3->setLength(9.0f);
    cylinder3->setRadius(1.0f);

    QStringList attributes;
    attributes.push_back(Qt3DCore::QAttribute::defaultPositionAttributeName());
    attributes.push_back(Qt3DCore::QAttribute::defaultNormalAttributeName());

    const QList<Qt3DAnimation::QMorphTarget*> morphTargets
            = { Qt3DAnimation::QMorphTarget::fromGeometry(cylinder1, attributes),
                Qt3DAnimation::QMorphTarget::fromGeometry(cylinder2, attributes),
                Qt3DAnimation::QMorphTarget::fromGeometry(cylinder3, attributes),
                Qt3DAnimation::QMorphTarget::fromGeometry(cylinder1, attributes) };

    Qt3DAnimation::QVertexBlendAnimation *animation = new Qt3DAnimation::QVertexBlendAnimation;
    const QList<float> times = { 0.0f, 5.0f, 8.0f, 12.0f };

    animation->setTargetPositions(times);
    animation->setTarget(mesh);
    animation->setMorphTargets(morphTargets);

    // Material
    Qt3DExtras::QMorphPhongMaterial *material = new Qt3DExtras::QMorphPhongMaterial(rootEntity);
    material->setDiffuse(Qt::red);

    QObject::connect(animation, &Qt3DAnimation::QVertexBlendAnimation::interpolatorChanged,
                     material, &Qt3DExtras::QMorphPhongMaterial::setInterpolator);

    // Cylinder
    Qt3DCore::QEntity *morphingEntity = new Qt3DCore::QEntity(rootEntity);
    morphingEntity->addComponent(mesh);
    morphingEntity->addComponent(transform);
    morphingEntity->addComponent(material);

    // Cylinder shape data
    Qt3DExtras::QCylinderMesh *cylinderMesh = new Qt3DExtras::QCylinderMesh();
    cylinderMesh->setRadius(1);
    cylinderMesh->setLength(3);
    cylinderMesh->setRings(100);
    cylinderMesh->setSlices(20);

    // Transform for cylinder
    Qt3DCore::QTransform *cylinderTransform = new Qt3DCore::QTransform;
    cylinderTransform->setScale(0.5f);
    cylinderTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 45.0f));

    // Material
    Qt3DExtras::QPhongMaterial *cylinderMaterial = new Qt3DExtras::QPhongMaterial(rootEntity);
    cylinderMaterial->setDiffuse(Qt::red);

    // Cylinder
    Qt3DCore::QEntity *cylinder = new Qt3DCore::QEntity(rootEntity);
    cylinder->addComponent(cylinderMesh);
    cylinder->addComponent(cylinderTransform);
    cylinder->addComponent(cylinderMaterial);

    QPropertyAnimation* anim = new QPropertyAnimation(animation);
    anim->setDuration(5000);
    anim->setEndValue(QVariant::fromValue(12.0f));
    anim->setStartValue(QVariant::fromValue(0.0f));
    anim->setLoopCount(-1);
    anim->setTargetObject(animation);
    anim->setPropertyName("position");
    anim->start();

    // Set root object of the scene
    view.setRootEntity(rootEntity);
    view.show();

    return app.exec();
}
