main.cpp Example File

assimp/main.cpp

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  ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
  ** Contact: http://www.qt-project.org/legal
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  ** Alternatively, this file may be used under the terms of the GNU
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  #include <window.h>
  #include <Qt3DRender/QRenderAspect>
  #include <Qt3DRender/QSceneLoader>
  #include <Qt3DCore/QEntity>
  #include <Qt3DInput/QInputAspect>
  #include <Qt3DQuick/QQmlAspectEngine>

  #include <QGuiApplication>
  #include <qqml.h>

  class SceneHelper : public QObject
  {
      Q_OBJECT

  public:
      Q_INVOKABLE QObject *findEntity(Qt3DRender::QSceneLoader *loader, const QString &name);
      Q_INVOKABLE QObject *findComponent(Qt3DCore::QEntity *entity, const QString &componentMetatype);
      Q_INVOKABLE void addListEntry(const QVariant &list, QObject *entry);
  };

  QObject *SceneHelper::findEntity(Qt3DRender::QSceneLoader *loader, const QString &name)
  {
      // The QSceneLoader instance is a component of an entity. The loaded scene
      // tree is added under this entity.
      QVector<Qt3DCore::QEntity *> entities = loader->entities();

      if (entities.isEmpty())
          return 0;

      // Technically there could be multiple entities referencing the scene loader
      // but sharing is discouraged, and in our case there will be one anyhow.
      Qt3DCore::QEntity *root = entities[0];

      // The scene structure and names always depend on the asset.
      return root->findChild<Qt3DCore::QEntity *>(name);
  }

  QObject *SceneHelper::findComponent(Qt3DCore::QEntity *entity, const QString &componentMetatype)
  {
      Q_ASSERT(entity);
      Qt3DCore::QComponentList components = entity->components();
      Q_FOREACH (Qt3DCore::QComponent *component, components) {
          qDebug() << component->metaObject()->className();
          if (component->metaObject()->className() == componentMetatype) {
              return component;
          }
      }
      return Q_NULLPTR;
  }

  void SceneHelper::addListEntry(const QVariant &list, QObject *entry)
  {
      QQmlListReference ref = list.value<QQmlListReference>();
      ref.append(entry);
  }

  int main(int argc, char* argv[])
  {
      QGuiApplication app(argc, argv);

      Window view;
      Qt3DCore::Quick::QQmlAspectEngine engine;

      engine.aspectEngine()->registerAspect(new Qt3DRender::QRenderAspect());
      engine.aspectEngine()->registerAspect(new Qt3DInput::QInputAspect());
      QVariantMap data;
      data.insert(QStringLiteral("surface"), QVariant::fromValue(static_cast<QSurface *>(&view)));
      data.insert(QStringLiteral("eventSource"), QVariant::fromValue(&view));
      engine.aspectEngine()->setData(data);
      qmlRegisterType<SceneHelper>("Qt3D.Examples", 2, 0, "SceneHelper");
      engine.setSource(QUrl("qrc:/main.qml"));
      view.show();

      return app.exec();
  }

  #include "main.moc"