- Qt 5.15
- Qt 3D
- C++ Classes
- QLayer
- Qt 5.15.18 Reference Documentation

# QLayer Class

class Qt3DRender::QLayer

The QLayer class provides a way of filtering which entities will be rendered. More...

Header: | #include <QLayer>
qmake: | QT += 3drender
Since: | Qt 5.5
Instantiated By: | Layer
Inherits: | Qt3DCore::QComponent

This class was introduced in Qt 5.5.

- List of all members, including inherited members

## Properties

- recursive : bool

## Public Functions

| QLayer(Qt3DCore::QNode *parent = nullptr)
bool | recursive() const
void | setRecursive(bool recursive)

## Signals

void | recursiveChanged()

## Detailed Description

Qt3DRender::QLayer works in conjunction with the Qt3DRender::QLayerFilter in the FrameGraph.

A QLayer can be applied to a subtree of entities by setting the recursive property to true.

      #include <Qt3DCore/QEntity>
      #include <Qt3DRender/QGeometryRenderer>
      #include <Qt3DRender/QLayer>
      #include <Qt3DRender/QLayerFilter>
      #include <Qt3DRender/QViewport>

     // Scene
     Qt3DCore::QEntity *rootEntity = new Qt3DCore::Qt3DCore::QEntity;

     Qt3DCore::QEntity *renderableEntity = new Qt3DCore::Qt3DCore::QEntity(rootEntity);
     Qt3DRender::QGeometryRenderer *geometryRenderer = new Qt3DCore::QGeometryRenderer(renderableEntity);
     Qt3DRender::QLayer *layer1 = new Qt3DCore::QLayer(renderableEntity);
     layer1->setRecursive(true);
     renderableEntity->addComponent(geometryRenderer);
     renderableEntity->addComponent(layer1);

     ...

     // FrameGraph
     Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport;
     Qt3DRender::QLayerFilter *layerFilter = new Qt3DRender::QLayerFilter(viewport);
     layerFilter->addLayer(layer1);

     ...

See also Qt3DRender::QLayerFilter.

## Property Documentation

### recursive : bool

Specifies if the layer is also applied to the entity subtree.

Access functions:

bool | recursive() const
void | setRecursive(bool recursive)

Notifier signal:

void | recursiveChanged()

## Member Function Documentation

### QLayer::QLayer(Qt3DCore::QNode *parent = nullptr)

Constructs a new QLayer with the specified parent.