我在root Entity里加入了一个正方体，代码如下：
m_cubeEntity = new Qt3DCore::QEntity;
...
Qt3DExtras::QCuboidMesh cubeMesh = new Qt3DExtras::QCuboidMesh;
Qt3DRender::QMaterial cubeMaterial = new Qt3DRender::QMaterial;
Qt3DCore::QTransform cubeTransform = new Qt3DCore::QTransform;
Qt3DRender::QObjectPicker objectPicker = new Qt3DRender::QObjectPicker;
...
m_cubeEntity.addComponent(cubeMesh);
m_cubeEntity.addComponent(cubeMaterial);
m_cubeEntity.addComponent(cubeTransform);
m_cubeEntity.adComponent(objectPicker);
m_cubeEntity.setParent(m_rootEntity);
到这里运行正常，3d场景里有一个正方体。
默认的拾取方式应该是PickingSettings.BoundingVolumePicking。但是准确度很低，我想改用PickingSettings.TrianglePicking。所以我尝试在root entity里加入RenderSettings，添加的代码如下：
m_renderSettings = new Qt3DRender::QRenderSettings();
m_renderSettings->pickingSettings()->setPickMethod(Qt3DRender::QPickingSettings::TrianglePicking);
m_renderSettings->pickingSettings()->setPickResultMode(Qt3DRender::QPickingSettings::AllPicks);
m_renderer = new Qt3DExtras::QForwardRenderer();
m_renderer->setClearColor(Qt::lightGray);
m_renderSettings->setActiveFrameGraph(m_renderer);
m_rootEntity->addComponent(m_renderSettings);
然后那个正方体就无法正常渲染了。
感觉应该是RenderSettings设置的有问题，有兄dei知道怎么修改吗（有鼠标拾取的需求，需要绘制自）？之前在用qml写也是这个问题 | 
