Qt Documentation

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QForwardRenderer Class

(Qt3DExtras::QForwardRenderer)

The QForwardRenderer provides a default FrameGraph implementation of a forward renderer. More...

Header: #include <QForwardRenderer>
qmake: QT += 3dextras
Since: Qt 5.7
Instantiated By: ForwardRenderer
Inherits: Qt3DRender::QTechniqueFilter

Properties

Public Functions

QForwardRenderer(Qt3DCore::QNode *parent = nullptr)
~QForwardRenderer()
Qt3DCore::QEntity *camera() const
QColor clearColor() const
QSize externalRenderTargetSize() const
QObject *surface() const
QRectF viewportRect() const

Public Slots

void setCamera(Qt3DCore::QEntity *camera)
void setClearColor(const QColor &clearColor)
void setExternalRenderTargetSize(const QSize &size)
void setSurface(QObject *surface)
void setViewportRect(const QRectF &viewportRect)

Signals

void cameraChanged(Qt3DCore::QEntity *camera)
void clearColorChanged(const QColor &clearColor)
void externalRenderTargetSizeChanged(const QSize &size)
void surfaceChanged(QObject *surface)
void viewportRectChanged(const QRectF &viewportRect)

Additional Inherited Members

  • 11 static public members inherited from QObject
  • 2 protected functions inherited from Qt3DCore::QNode
  • 9 protected functions inherited from QObject

Detailed Description

The QForwardRenderer provides a default FrameGraph implementation of a forward renderer.

Forward rendering is what OpenGL traditionally uses. It renders directly to the backbuffer one object at a time shading each one as it goes.

QForwardRenderer is a single leaf FrameGraph tree which contains a Qt3DRender::QViewport, a Qt3DRender::QCameraSelector, and a Qt3DRender::QClearBuffers. The QForwardRenderer has a default requirement filter key whose name is "renderingStyle" and value "forward". If you need to filter out your techniques, you should do so based on that filter key.

By default the viewport occupies the whole screen and the clear color is white. Frustum culling is also enabled.

Property Documentation

camera : Qt3DCore::QEntity *

Holds the current camera entity used to render the scene.

Note: A camera is a QEntity that has a QCameraLens as one of its components.

Access functions:

Qt3DCore::QEntity *camera() const
void setCamera(Qt3DCore::QEntity *camera)

Notifier signal:

void cameraChanged(Qt3DCore::QEntity *camera)

clearColor : QColor

Holds the current clear color of the scene. The frame buffer is initialized to the clear color before rendering.

Access functions:

QColor clearColor() const
void setClearColor(const QColor &clearColor)

Notifier signal:

void clearColorChanged(const QColor &clearColor)

externalRenderTargetSize : QSize

Access functions:

QSize externalRenderTargetSize() const
void setExternalRenderTargetSize(const QSize &size)

Notifier signal:

void externalRenderTargetSizeChanged(const QSize &size)

surface : QObject *

Holds the current render surface.

Access functions:

QObject *surface() const
void setSurface(QObject *surface)

Notifier signal:

void surfaceChanged(QObject *surface)

viewportRect : QRectF

Holds the current normalized viewport rectangle.

Access functions:

QRectF viewportRect() const
void setViewportRect(const QRectF &viewportRect)

Notifier signal:

void viewportRectChanged(const QRectF &viewportRect)

Member Function Documentation

QForwardRenderer::QForwardRenderer(Qt3DCore::QNode *parent = nullptr)

Default constructs an instance of QForwardRenderer.

QForwardRenderer::~QForwardRenderer()

Destroys the instance of QForwardRenderer.

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