Some errors when using Scene3D inside Page

[tanshihaj]

When I'm using Scene3D inside ApplicationWindow or Item everything is ok, but when I'm trying to insert Scene3D into Page:

import QtQuick 2.4
import QtQuick.Controls 2.0
import QtQuick.Scene3D 2.0

import Qt3D.Core 2.0
import Qt3D.Render 2.0
import Qt3D.Input 2.0
import Qt3D.Extras 2.0

ApplicationWindow {
    visible: true

    Page {
        id: page
        title: "Page#1"

        Scene3D {
            id: mapScene
            anchors.fill: parent

            Entity {
                id: sceneRoot

                Camera {
                    id: camera
                }

                components: [
                    RenderSettings {
                        activeFrameGraph: ForwardRenderer {
                            clearColor: Qt.rgba( 1.0, 1.0, 1.0, 1.0 )
                            camera: camera
                        }
                    }
                ]

                InputSettings {
                }
            }
        }
    }
}

Some errors are appears:

QML debugging is enabled. Only use this in a safe environment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObjectPrivate::checkFramebufferStatus: QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.

It seems this errors doesn't lead to problems or crash. Why do this errors appear?

main.cpp:

#include <QtGui/QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QtQml>

int main(int argc, char* argv[])
{
    qSetMessagePattern( "%{function}: %{message}" );

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl("qrc:/main.qml"));

    return app.exec();
}

[Cupras]

I'm having the same problem right now (Qt 5.8). Do you find any solution for that?

[Sergei Ozerov]

Same problem with Qt 5.12. Also produces huge flickering on all pages except for page with Scene3D.
UPD: in my case it seems that the problem was not in Page component, but rather in a StackView that used Pages. Page with Scene3D embedded directly in ApplicationWindow worked just fine.

[Karwan]

Just add this properties to Scene3D
multisample: false
Yeah you can call it it's Trick :) , this will solve fps problem , and i don't know why they don't call it in the documentation .

[simonma]

I experience the same problem with a Scene3D in a StackLayout. If I set anchors.fill = parent, the flickering and the warnings are gone, but I get a new warning:
"QML Scene3D: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead."

But using
Layout.fillWidth: true
Layout.fillHeight: true
instead doesn't fix the problem.

Adding
multisample: false
didn't work