QNoDraw Class

当 Qt3DRender::QNoDraw node is present in a FrameGraph branch, this prevents the renderer from rendering any primitive. 更多...

头：	#include <QNoDraw>
qmake:	QT += 3drender
Since:	Qt 5.5
实例化：	NoDraw
继承：	Qt3DRender::QFrameGraphNode

公共函数

QNoDraw (Qt3DCore::QNode * parent = nullptr)

1 公共函数继承自 Qt3DRender::QFrameGraphNode
13 公共函数继承自 Qt3DCore::QNode
31 公共函数继承自 QObject

静态公共成员

const QMetaObject

staticMetaObject

9 静态公共成员继承自 QObject

额外继承成员

3 特性继承自 Qt3DCore::QNode
1 特性继承自 QObject
3 公共槽继承自 Qt3DCore::QNode
1 公共槽继承自 QObject
4 信号继承自 Qt3DCore::QNode
2 信号继承自 QObject
1 保护函数继承自 Qt3DRender::QFrameGraphNode
2 保护函数继承自 Qt3DCore::QNode
9 保护函数继承自 QObject

详细描述

当 Qt3DRender::QNoDraw node is present in a FrameGraph branch, this prevents the renderer from rendering any primitive.

Qt3DRender::QNoDraw should be used when the FrameGraph needs to set up some render states or clear some buffers without requiring any mesh to be drawn. It has the same effect as having a Qt3DRender::QRenderPassFilter that matches none of available Qt3DRender::QRenderPass instances of the scene without the overhead cost of actually performing the filtering.

When disabled, a Qt3DRender::QNoDraw node won't prevent the scene from being rendered. Toggling the enabled property is therefore a way to make a Qt3DRender::QNoDraw active or inactive.

Qt3DRender::QNoDraw is usually used as a child of a Qt3DRendeR::QClearBuffers node to prevent from drawing the scene when there are multiple render passes.

Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport();
Qt3DRender::QCameraSelector *cameraSelector = new Qt3DRender::QCameraSelector(viewport);
Qt3DRender::QClearBuffers *clearBuffers = new Qt3DRender::QClearBuffers(cameraSelector);
clearBuffers->setBuffers(Qt3DRender::QClearBuffers::ColorDepthBuffer);
Qt3DRender::QNoDraw *noDraw = new Qt3DRender::QNoDraw(clearBuffers);
Qt3DRender::QRenderPassFilter *mainPass = new Qt3DRender::QRenderPassFilter(cameraSelector);
....
Qt3DRender::QRenderPassFilter *previewPass = new Qt3DRender::QRenderPassFilter(cameraSelector);
....

成员函数文档编制

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

The constructor creates an instance with the specified parent .