【发布时间】：2019-12-21 14:48:53
【问题描述】：
我正在尝试使用层过滤，如 this answer 所示。为此，我编写了一个简单的测试（见下文）。 如果我将代码从 My3DWindow 类传输到 main.cpp - 此代码有效。 My3DWindow 类中的错误在哪里？完整的测试项目可以查看here。
main.cpp
int main(int argc, char *argv[])
{
QGuiApplication application(argc, argv);
auto window = new My3DWindow;
auto sphere1 = new Qt3DCore::QEntity(window->Scene());
auto sphere2 = new Qt3DCore::QEntity(window->Scene());
auto transform1 = new Qt3DCore::QTransform;
transform1->setTranslation(QVector3D(0.0f, 0.0f, -10.0f));
auto transform2 = new Qt3DCore::QTransform;
transform2->setTranslation(QVector3D(-10.0f, 0.0f, 0.0f));
auto material1 = new Qt3DExtras::QPhongMaterial;
material1->setAmbient(Qt::blue);
auto material2 = new Qt3DExtras::QPhongAlphaMaterial;
material2->setAmbient(Qt::red);
auto spheremesh = new Qt3DExtras::QSphereMesh;
spheremesh->setRadius(15.0);
spheremesh->setSlices(32);
spheremesh->setRings(32);
sphere1->addComponent(transform1);
sphere1->addComponent(material1);
sphere1->addComponent(spheremesh);
sphere1->addComponent(window->OpaqueLayer());
sphere2->addComponent(transform2);
sphere2->addComponent(material2);
sphere2->addComponent(spheremesh);
sphere2->addComponent(window->TransparentLayer());
window->show();
return application.exec();
}
和My3DWindow 类：
My3DWindow::My3DWindow(QScreen *screen):
Qt3DExtras::Qt3DWindow(screen)
{
m_Scene = new Qt3DCore::QEntity;
setRootEntity(m_Scene);
auto renderSurfaceSelector = new Qt3DRender::QRenderSurfaceSelector(m_Scene);
renderSurfaceSelector->setSurface(this);
auto clearBuffers = new Qt3DRender::QClearBuffers(renderSurfaceSelector);
clearBuffers->setBuffers(Qt3DRender::QClearBuffers::AllBuffers);
clearBuffers->setClearColor(Qt::gray);
auto viewport = new Qt3DRender::QViewport(renderSurfaceSelector);
auto cameraSelector = new Qt3DRender::QCameraSelector(viewport);
m_Camera = new Qt3DRender::QCamera(cameraSelector);
m_Camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
m_Camera->setPosition(QVector3D(0.0f, 0.0f, 100.0f));
m_Camera->setViewCenter(QVector3D(0.0f, 0.0f, 0.0f));
auto cameraController = new Qt3DExtras::QFirstPersonCameraController(m_Scene);
cameraController->setCamera(m_Camera);
m_TransparentLayer = new Qt3DRender::QLayer;
auto transparentFilter = new Qt3DRender::QLayerFilter(m_Camera);
transparentFilter->addLayer(m_TransparentLayer);
m_OpaqueLayer = new Qt3DRender::QLayer;
auto opaqueFilter = new Qt3DRender::QLayerFilter(m_Camera);
opaqueFilter->addLayer(m_OpaqueLayer);
setActiveFrameGraph(renderSurfaceSelector);
}
【问题讨论】：
-
您将代码从 My3DWindow.cpp 移动到 main.cpp，然后您可以做不同的事情是像
renderSurfaceSelector->setSurface(this)这样的“父”依赖项。我们还没有看到 main.cpp 的工作案例，还没有发现真正的不同之处。 -
@AlexanderV 我的错。 1）在早上而不是晚上编码需要。 2）我在初始化相机后（在声明“cameraController”之前）错过了一个重要的行：
cameraSelector->setCamera(m_Camera);完全正确的代码我会发布here但是一个小问题仍然存在。有时测试应用程序在关闭时会崩溃。可能是什么原因？ -
@AlexanderV 还出现了在某些球体叠加处显示伪影的问题。听起来不错。但这可能是一个单独的问题。只需尝试在完整的测试代码中按下 WSAD 按钮。