QSceneLoader Class
(Qt3DRender::QSceneLoader)Provides the facility to load an existing Scene. More...
| Header: | #include <QSceneLoader> |
| qmake: | QT += 3drender |
| Since: | Qt 5.7 |
| Instantiated By: | SceneLoader |
| Inherits: | Qt3DCore::QComponent |
This class was introduced in Qt 5.7.
Public Types
| enum | ComponentType { UnknownComponent, GeometryRendererComponent, TransformComponent, MaterialComponent, LightComponent, CameraLensComponent } |
| enum | Status { None, Loading, Ready, Error } |
Properties
Public Functions
| QSceneLoader(Qt3DCore::QNode *parent = nullptr) | |
| Qt3DCore::QComponent * | component(const QString &entityName, Qt3DRender::QSceneLoader::ComponentType componentType) const |
| Qt3DCore::QEntity * | entity(const QString &entityName) const |
| QStringList | entityNames() const |
| QUrl | source() const |
| Qt3DRender::QSceneLoader::Status | status() const |
Public Slots
| void | setSource(const QUrl &arg) |
Signals
| void | sourceChanged(const QUrl &source) |
| void | statusChanged(Qt3DRender::QSceneLoader::Status status) |
Detailed Description
Given a 3D source file, the Qt3DRender::QSceneLoader will try to parse it and build a tree of Qt3DCore::QEntity objects with proper Qt3DRender::QGeometryRenderer, Qt3DCore::QTransform and Qt3DRender::QMaterial components.
The loader will try to determine the best material to be used based on the properties of the model file. If you wish to use a custom material, you will have to traverse the tree and replace the default associated materials with yours.
As the name implies, Qt3DRender::QSceneLoader loads a complete scene subtree. If you wish to load a single piece of geometry, you should rather use the Qt3DRender::QMesh instead.
Qt3DRender::QSceneLoader internally relies on the use of plugins to support a wide variety of 3D file formats. Here is a list of formats that are supported by Qt3D.
Note: this component shouldn't be shared among several Qt3DCore::QEntity instances. Undefined behavior will result.
See also Qt3DRender::QMesh and Qt3DRender::QGeometryRenderer.
Member Type Documentation
enum QSceneLoader::ComponentType
This enum specifies a component type.
| Constant | Value | Description |
|---|---|---|
Qt3DRender::QSceneLoader::UnknownComponent | 0 | Unknown component type |
Qt3DRender::QSceneLoader::GeometryRendererComponent | 1 | Qt3DRender::QGeometryRenderer component |
Qt3DRender::QSceneLoader::TransformComponent | 2 | Qt3DCore::QTransform component |
Qt3DRender::QSceneLoader::MaterialComponent | 3 | Qt3DRender::QMaterial component |
Qt3DRender::QSceneLoader::LightComponent | 4 | Qt3DRender::QAbstractLight component |
Qt3DRender::QSceneLoader::CameraLensComponent | 5 | Qt3DRender::QCameraLens component |
enum QSceneLoader::Status
This enum identifies the state of loading
| Constant | Value | Description |
|---|---|---|
Qt3DRender::QSceneLoader::None | 0 | The Qt3DRender::QSceneLoader hasn't been used yet. |
Qt3DRender::QSceneLoader::Loading | 1 | The Qt3DRender::QSceneLoader is currently loading the scene file. |
Qt3DRender::QSceneLoader::Ready | 2 | The Qt3DRender::QSceneLoader successfully loaded the scene file. |
Qt3DRender::QSceneLoader::Error | 3 | The Qt3DRender::QSceneLoader encountered an error while loading the scene file. |
Property Documentation
source : QUrl
Holds the url to the source to be loaded.
Access functions:
| QUrl | source() const |
| void | setSource(const QUrl &arg) |
Notifier signal:
| void | sourceChanged(const QUrl &source) |
status : const Status
Holds the status of scene loading.
- SceneLoader.None
- SceneLoader.Loading
- SceneLoader.Ready
- SceneLoader.Error
Access functions:
| Qt3DRender::QSceneLoader::Status | status() const |
Notifier signal:
| void | statusChanged(Qt3DRender::QSceneLoader::Status status) |
See also Qt3DRender::QSceneLoader::Status.
Member Function Documentation
QSceneLoader::QSceneLoader(Qt3DCore::QNode *parent = nullptr)
The constructor creates an instance with the specified parent.
Qt3DCore::QComponent *QSceneLoader::component(const QString &entityName, Qt3DRender::QSceneLoader::ComponentType componentType) const
Returns a component matching componentType of a loaded entity with an objectName matching the entityName. If the entity has multiple matching components, the first match in the component list of the entity is returned. If there is no match, a null pointer is returned.
Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.
Qt3DCore::QEntity *QSceneLoader::entity(const QString &entityName) const
Returns a loaded entity with an objectName matching the entityName parameter. If multiple entities have the same name, it is undefined which one of them is returned, but it will always be the same one.
Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.
QStringList QSceneLoader::entityNames() const
Returns a list of the objectNames of the loaded entities.
Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.
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