Ytukyg

I use qt 5.5 in ubuntu 18.04, i need to display 3d model(in obj format), i use qquickwidget and qml(Scene3D), it works fine for display model, but when the application exit, it will crash. the error message i get from qtcreator console as bellow:

QMutex::lock()                                         0x7ffff53b0725 

QSemaphore::acquire(int)                               0x7ffff53b23f4 

Qt3D::QAspectManager::quit()                           0x7fffc77c03bd 

Qt3D::QAspectEngine::shutdown()                        0x7fffc77be54a 

Qt3D::QAspectEngine::~QAspectEngine()                  0x7fffc77be94e 

Qt3D::QAspectEngine::~QAspectEngine()                  0x7fffc77be9d9 

??                                                     0x7fffc8036c27 

QMetaObject::activate(QObject *, int, int, void * *)   0x7ffff55d3cfa 

QObject::destroyed(QObject *)                          0x7ffff55d4a6f 

QObject::~QObject()                                    0x7ffff55dcdab 

QQuickWindow::~QQuickWindow()                          0x7ffff3d43931 

QQuickWindow::~QQuickWindow()                          0x7ffff3d43999 

??                                                     0x7ffff76bbb8a 

??                                                     0x7ffff76bbc99 

QObject::~QObject()                                    0x7ffff55dcb6b 

QWidget::~QWidget()                                    0x7ffff6fc600b 

QQuickWidget::~QQuickWidget()                          0x7ffff76bb119 

QObjectPrivate::deleteChildren()                       0x7ffff55d2bdc 

QWidget::~QWidget()                                    0x7ffff6fc5f8b

It seem like that it's because QQuickWindow destructor was called twice. I had try to remove the 3d related core in the qml, just draw a simple 2d rectangle, it will not be crashed, does anyone help me to fix this problem, thank you very much. Bellow are my qml file;
(1) main.qml

import QtQuick 2.0

import QtQuick.Scene3D 2.0

import QtQuick.Controls 1.4

import QtQuick.Layouts 1.2

import Qt3D 2.0



Item {

  id: main



 Camera {

    id: camera

}



Entity {

    components: [

        ShadowMapFrameGraph {

            id: framegraph

            viewCamera: camera

            lightCamera: light.lightCamera

        }

    ]

}



Light {

    id: light

}



AdsEffect {

    id: shadowMapEffect



    shadowTexture: framegraph.shadowTexture

    light: light

}





Scene3D {

    id: scene3D

    anchors.fill: parent

    anchors.verticalCenter: parent.verticalCenter

    focus: true

    aspects: "input"



    obj_model{

        id: model

    }

}

}

(2) obj_model.qml

import Qt3D 2.0

import Qt3D.Renderer 2.0

import QtQuick 2.1 as QQ2



Entity {

id: root

property Material material

Camera {

    id: camera

    projectionType: CameraLens.PerspectiveProjection

    fieldOfView: 40

    aspectRatio: 4/3

    nearPlane : 0.1

    farPlane : 3000.0

    position: Qt.vector3d( 0.0, -1000, 300.0 )

    upVector: Qt.vector3d( 0.0, 0.0, 1.0 )

    viewCenter: Qt.vector3d( 0.0, 0.0, 300.0 )

}



Configuration  {

    controlledCamera: camera

}





components: [

    FrameGraph {

        activeFrameGraph: ForwardRenderer {

            camera: camera

            clearColor: "white"

        }

    }

]



PhongMaterial {

    id: material

    ambient: Qt.rgba( 0.8, 0.8, 0.8, 1.0 )

    diffuse: Qt.rgba( 0.1, 0.1, 0.1, 0.5 )

    shininess: 50 //shining.value

}



Transform {

    id: logoTransform

}



Mesh {

    id: logoMesh

    source: "../res/model.obj"

}



Entity {

    id: logoEntity

    components: [ logoMesh, material, logoTransform ]

}

}

It's a bug of qt 5.5, need to update qt version.