Qt3D - [c++] Q: 3D Window is not showing on Windows 10 Build

kevin_d

Hi!

I am compiling my application on windows using qt creator with QT 5.15.1.
When running, i don't get any errors or warnings. The Application is shown.
Except of - 3D content in the Qt3DWindow (Qt3DExtras::Qt3DWindow).

On linux, it is working well.
Do i miss anything which needs to be considered when building / running Qt3D on windows?

Any help is highly appreciated!

best regards, kevin

kevin_d

This is the code, which displays the window:

view = (Qt3DExtras::Qt3DWindow *)scene;
widget = QWidget::createWindowContainer(scene);

if (camera == nullptr)
{
    camera = view->camera();
    camera->lens()->setPerspectiveProjection(45.0f, 45.0f, 1.0f, 1000.0f);
    camera->setPosition(QVector3D(0,-50,50));
    camera->setViewCenter(QVector3D(0,0,0));
}

layout = new QHBoxLayout(widget);
layout->setContentsMargins(0,0,0,0);
layout->setMargin(8);
layout->addWidget(container);
widget->setVisible(true);
widget->showMinimized();
widget->close();

view->setRootEntity(scene->entity);
view->show();

setLayout(layout);

btw, im compiling with VS2019 Toolset and 32 bit.

kevin_d

and, additionally, these trailing lines.

view->setRootEntity(scene->entity);
view->showMaximized();
view->show();

Regard, the window is shown white Canvas, but no content.

kevin_d

Do I miss any OpenGL / DirectX setting?
Any C++ flags for the windows environment?
Any additional statements to enable the graphical rendering?

kevin_d

I found out what was the problem:

The Window, which hosts the layout in which the 3D Widget is set, contains the following statement in the constructor:

setWindowState(windowState() | Qt::WindowMaximized);

or..

setWindowState(Qt::WindowMaximized);

I removed this statement and the 3D Window now shows the content.

This is not happening in the Linux build!

Now, both builds work correctly.

Issue is solved.