QNoDrawnode is present in a FrameGraph branch, this prevents the renderer from rendering any primitive. More…
QNoDrawshould 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
QRenderPassFilterthat matches none of available
QRenderPassinstances of the scene without the overhead cost of actually performing the filtering.
When disabled, a
QNoDrawnode won’t prevent the scene from being rendered. Toggling the enabled property is therefore a way to make a
QNoDrawactive or inactive.
QNoDrawis 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); ....
- param parent
The constructor creates an instance with the specified
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