Qt 5.6 | Qt 3D | Qt 3D: assimp Example | main.cpp Example File

Qt 5.6.3 Reference Documentation

# main.cpp Example File

assimp/main.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
      ** Contact: http://www.qt-project.org/legal
      **
      ** This file is part of the Qt3D module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL3$
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      ** and conditions see http://www.qt.io/terms-conditions. For further
      ** information use the contact form at http://www.qt.io/contact-us.
      **
      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 3 as published by the Free Software
      ** Foundation and appearing in the file LICENSE.LGPLv3 included in the
      ** packaging of this file. Please review the following information to
      ** ensure the GNU Lesser General Public License version 3 requirements
      ** will be met: https://www.gnu.org/licenses/lgpl.html.
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      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 2.0 or later as published by the Free
      ** Software Foundation and appearing in the file LICENSE.GPL included in
      ** the packaging of this file. Please review the following information to
      ** ensure the GNU General Public License version 2.0 requirements will be
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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"