mirror of https://github.com/qt/qt3d.git
119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
// Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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#include <QFileDialog>
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#include <QApplication>
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#include <Qt3DRender/QCamera>
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#include <Qt3DCore/QEntity>
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#include <Qt3DCore/QAspectEngine>
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#include <Qt3DInput/QInputAspect>
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#include <Qt3DRender/QSceneLoader>
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#include <Qt3DRender/QRenderAspect>
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#include <Qt3DExtras/QForwardRenderer>
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#include <Qt3DExtras/qt3dwindow.h>
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#include <Qt3DExtras/qfirstpersoncameracontroller.h>
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class SceneWalker : public QObject
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{
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public:
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SceneWalker(Qt3DRender::QSceneLoader *loader) : m_loader(loader) { }
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void onStatusChanged();
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private:
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void walkEntity(Qt3DCore::QEntity *e, int depth = 0);
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Qt3DRender::QSceneLoader *m_loader;
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};
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void SceneWalker::onStatusChanged()
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{
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qDebug() << "Status changed:" << m_loader->status();
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if (m_loader->status() != Qt3DRender::QSceneLoader::Ready)
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return;
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// The QSceneLoader instance is a component of an entity. The loaded scene
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// tree is added under this entity.
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QList<Qt3DCore::QEntity *> entities = m_loader->entities();
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// Technically there could be multiple entities referencing the scene loader
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// but sharing is discouraged, and in our case there will be one anyhow.
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if (entities.isEmpty())
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return;
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Qt3DCore::QEntity *root = entities[0];
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// Print the tree.
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walkEntity(root);
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// To access a given node (like a named mesh in the scene), use QObject::findChild().
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// The scene structure and names always depend on the asset.
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Qt3DCore::QEntity *e = root->findChild<Qt3DCore::QEntity *>(QStringLiteral("PlanePropeller_mesh")); // toyplane.obj
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if (e)
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qDebug() << "Found propeller node" << e << "with components" << e->components();
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}
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void SceneWalker::walkEntity(Qt3DCore::QEntity *e, int depth)
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{
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Qt3DCore::QNodeVector nodes = e->childNodes();
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for (int i = 0; i < nodes.count(); ++i) {
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Qt3DCore::QNode *node = nodes[i];
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Qt3DCore::QEntity *entity = qobject_cast<Qt3DCore::QEntity *>(node);
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if (entity) {
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QString indent;
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indent.fill(' ', depth * 2);
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qDebug().noquote() << indent << "Entity:" << entity << "Components:" << entity->components();
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walkEntity(entity, depth + 1);
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}
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}
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}
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int main(int ac, char **av)
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{
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QApplication app(ac, av);
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Qt3DExtras::Qt3DWindow view;
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view.defaultFrameGraph()->setClearColor(Qt::black);
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// Root entity
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Qt3DCore::QEntity *sceneRoot = new Qt3DCore::QEntity();
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// Scene Camera
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Qt3DRender::QCamera *camera = view.camera();
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camera->setProjectionType(Qt3DRender::QCameraLens::PerspectiveProjection);
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camera->setViewCenter(QVector3D(0.0f, 3.5f, 0.0f));
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camera->setPosition(QVector3D(0.0f, 3.5f, 25.0f));
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camera->setNearPlane(0.001f);
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camera->setFarPlane(10000.0f);
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// For camera controls
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Qt3DExtras::QFirstPersonCameraController *camController = new Qt3DExtras::QFirstPersonCameraController(sceneRoot);
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camController->setCamera(camera);
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// Scene loader
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Qt3DCore::QEntity *sceneLoaderEntity = new Qt3DCore::QEntity(sceneRoot);
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Qt3DRender::QSceneLoader *sceneLoader = new Qt3DRender::QSceneLoader(sceneLoaderEntity);
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SceneWalker sceneWalker(sceneLoader);
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QObject::connect(sceneLoader, &Qt3DRender::QSceneLoader::statusChanged, &sceneWalker, &SceneWalker::onStatusChanged);
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sceneLoaderEntity->addComponent(sceneLoader);
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QStringList args = QCoreApplication::arguments();
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QUrl sourceFileName;
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if (args.count() <= 1) {
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QWidget *container = new QWidget();
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QFileDialog dialog;
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dialog.setFileMode(QFileDialog::AnyFile);
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sourceFileName = dialog.getOpenFileUrl(container, QStringLiteral("Open a scene file"));
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} else {
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sourceFileName = QUrl::fromLocalFile(args[1]);
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}
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if (sourceFileName.isEmpty())
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return 0;
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sceneLoader->setSource(sourceFileName);
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view.setRootEntity(sceneRoot);
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view.show();
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return app.exec();
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}
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