void SceneWalker::onStatusChanged()
{
qDebug() << "Status changed:" << m_loader->status();
if (m_loader->status() != Qt3DRender::QSceneLoader::Ready)
return;
// The QSceneLoader instance is a component of an entity. The loaded scene
// tree is added under this entity.
QVector<Qt3DCore::QEntity *> entities = m_loader->entities();
// Technically there could be multiple entities referencing the scene loader
// but sharing is discouraged, and in our case there will be one anyhow.
if (entities.isEmpty())
return;
Qt3DCore::QEntity *root = entities[0];
// Print the tree.
walkEntity(root);
// To access a given node (like a named mesh in the scene), use QObject::findChild().
// The scene structure and names always depend on the asset.
Qt3DCore::QEntity *e = root->findChild<Qt3DCore::QEntity *>(QStringLiteral("PlanePropeller_mesh")); // toyplane.obj
if (e)
qDebug() << "Found propeller node" << e << "with components" << e->components();
}
void QObjectPickerPrivate::propagateEvent(QPickEvent *event, EventType type)
{
if (!m_entities.isEmpty()) {
Qt3DCore::QEntity *entity = m_entities.first();
Qt3DCore::QEntity *parentEntity = nullptr;
while (entity != nullptr && entity->parentEntity() != nullptr && !event->isAccepted()) {
parentEntity = entity->parentEntity();
const auto components = parentEntity->components();
for (Qt3DCore::QComponent *c : components) {
if (auto objectPicker = qobject_cast<Qt3DRender::QObjectPicker *>(c)) {
QObjectPickerPrivate *objectPickerPrivate = static_cast<QObjectPickerPrivate *>(QObjectPickerPrivate::get(objectPicker));
switch (type) {
case Pressed:
objectPickerPrivate->pressedEvent(event);
break;
case Released:
objectPickerPrivate->releasedEvent(event);
break;
case Clicked:
objectPickerPrivate->clickedEvent(event);
break;
case EventType::Moved:
objectPickerPrivate->movedEvent(event);
break;
}
break;
}
}
entity = parentEntity;
}
}
}
void SceneWalker::walkEntity(Qt3DCore::QEntity *e, int depth)
{
Qt3DCore::QNodeVector nodes = e->childNodes();
for (int i = 0; i < nodes.count(); ++i) {
Qt3DCore::QNode *node = nodes[i];
Qt3DCore::QEntity *entity = qobject_cast<Qt3DCore::QEntity *>(node);
if (entity) {
QString indent;
indent.fill(' ', depth * 2);
qDebug().noquote() << indent << "Entity:" << entity << "Components:" << entity->components();
walkEntity(entity, depth + 1);
}
}
}