QNoDraw Class

(Qt3DRender::QNoDraw)

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

头文件:	#include <QNoDraw>
qmake:	QT += 3drender
开始支持版本:	Qt 5.5
Instantiated By:	NoDraw
基类:	Qt3DRender::QFrameGraphNode

所有的成员列表, 包括继承的成员

公有函数

QNoDraw(Qt3DCore::QNode *parent = nullptr)

1 个公有函数继承自 Qt3DRender::QFrameGraphNode
11 个公有函数继承自 Qt3DCore::QNode
32 个公有函数继承自 QObject

其他继承的成员

3 个属性继承自 Qt3DCore::QNode
1 个属性继承自 QObject
3 个公有槽函数继承自 Qt3DCore::QNode
1 个公有槽函数继承自 QObject
4 个信号继承自 Qt3DCore::QNode
2 个信号继承自 QObject
1 个公有变量继承自 QObject
10 个静态公有成员继承自 QObject
1 个受保护的函数继承自 Qt3DRender::QFrameGraphNode
2 个受保护的函数继承自 Qt3DCore::QNode
9 个受保护的函数继承自 QObject
2 个受保护的变量继承自 QObject

详细描述

When a 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

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

Default constructs an instance of QNoDraw.

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