将QMultiSampleAntiAliasing添加到QForwardRenderer [英] Add QMultiSampleAntiAliasing to a QForwardRenderer

问题描述

我正在尝试在qt3d中启用多重采样. Qt3DExtras :: Qt3DWindow在初始化过程中已经执行了以下操作:

I'm trying to enable Multisampling in qt3d. The Qt3DExtras::Qt3DWindow already does the following during initialisation:

format.setDepthBufferSize(24);
format.setSamples(4);
format.setStencilBufferSize(8);
setFormat(format);
QSurfaceFormat::setDefaultFormat(format);

这是一个好的开始.因此，根据这篇文章，这是唯一的启用多重采样所需的OpenGL调用将是

which is a good start. So according to this post, the only OpenGL call necessary to enable Multisampling would be

glEnable(GL_MULTISAMPLE);

确实， QMultiSampleAntiAliasing的文档指出:

注意:使用OpenGL作为图形API时，如果已将QMultiSampleAntiAliasing添加到渲染状态，则会调用glEnable(GL_MULTISAMPLE).

Note: When using OpenGL as the graphics API, glEnable(GL_MULTISAMPLE) will be called if QMultiSampleAntiAliasing has been added to the render states.

因此，要将QMultiSampleAntiAliasing添加到框架图中，我想到了以下内容:

So to add the QMultiSampleAntiAliasing to the Framegraph, I came up with the following:

//For antialiasing
Qt3DRender::QRenderStateSet *multiSampleRenderStateSet = new Qt3DRender::QRenderStateSet;
Qt3DRender::QMultiSampleAntiAliasing *msaa = new Qt3DRender::QMultiSampleAntiAliasing;
multiSampleRenderStateSet->addRenderState(msaa);
this->activeFrameGraph()->setParent(multiSampleRenderStateSet);
this->setActiveFrameGraph(multiSampleRenderStateSet);

但是很明显，由于这会全局覆盖所有默认的RenderState，因此给我留下了相当混乱的渲染.而且我什至不能确定是否启用了多重采样(或者之前是否已经启用了多重采样?).

But obviously, as this overwrites all default RenderStates globally, it leaves me with a pretty messed up rendering. And I'm not even sure Multisampling is enabled (or whether it was even already enabled before?).

基本上，我的问题是:

将QRenderState添加到默认QForwardRenderer框架图的最简单方法是什么?尤其是QMultiSampleAntiAliasing?

推荐答案

好的，因此，在阅读

Okay, so after reading this email-thread, I now use the following lines:

//For antialiasing
Qt3DRender::QRenderStateSet *renderStateSet = new Qt3DRender::QRenderStateSet;

Qt3DRender::QMultiSampleAntiAliasing *msaa = new Qt3DRender::QMultiSampleAntiAliasing;
renderStateSet->addRenderState(msaa);
Qt3DRender::QDepthTest *depthTest = new Qt3DRender::QDepthTest;
depthTest->setDepthFunction(Qt3DRender::QDepthTest::LessOrEqual);
renderStateSet->addRenderState(depthTest);

this->activeFrameGraph()->setParent(renderStateSet);
this->setActiveFrameGraph(renderStateSet);

这显然恢复了Qt3D的默认DepthTest，并给了我看似干净的渲染.

This apparently restores the default DepthTest of Qt3D and gives me a seemingly clean render.

这篇关于将QMultiSampleAntiAliasing添加到QForwardRenderer的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！