Qt3D点线选择？

Question

我一直在尝试在Qt3D中的网格上进行点和线的拾取。这是三角拾取的工作版本，

auto renderSettings = new Qt3DRender::QRenderSettings(root);
renderSettings->pickingSettings()->setPickMethod(Qt3DRender::QPickingSettings::TrianglePicking);

auto entity = new Qt3DCore::QEntity(root);
auto picker = new Qt3DRender::QObjectPicker;
auto sphere = new Qt3DExtras::QSphereMesh;
entity->addComponent(picker);
entity->addComponent(sphere);

connect(picker, &Qt3DRender::QObjectPicker::clicked, [] 
  (Qt3DRender::QPickEvent* e) {
  auto p = dynamic_cast<Qt3DRender::QPickTriangleEvent*>(e);
  auto idx = p->triangleIndex();
});

但是，当我切换到点拾取或线拾取时，单击事件永远不会触发。任何想法如何使这项工作？预先感谢。