[Interest] Some crash when adding and removing entities in Qt3D.

[Kamil Zaripov]

Hi,

I have entities that should be created and deleted at runtime. Entity have only 
material and mesh component. Material is QDiffuseMapMaterial with QTextureImage.

When entities begin to add and delete from scene, sometimes application crashes 
with this assert:

qt_assert: ASSERT: "img != nullptr" in file 
../../include/Qt3DRender/5.8.0/Qt3DRender/private/../../../../../src/render/texture/apitexturemanager_p.h,
 line 286 <x-msg://4/src/render/texture/apitexturemanager_p.h,%20line%20286>

But unfortunately I can’t find why it happenes. I’m adding the entity this way:


    QEntity * visibleObject = new QEntity();

    QDiffuseMapMaterial * material = new QDiffuseMapMaterial();

    QTextureImage * diffuseTextureImage = new QTextureImage();
    diffuseTextureImage->setSource(QUrl("qrc:/resources/tile.png"));
    material->diffuse()->addTextureImage(diffuseTextureImage);
    material->setShininess(0.1);
    visibleObject->addComponent(material);

    // set mesh
    QPlaneMesh * mesh = new QPlaneMesh();
    mesh->setWidth(1.0 / 2);
    mesh->setHeight(1.0 / 2);
    visibleObject->addComponent(mesh);

    visibleObject->setParent(_rootEntity);



 And delete just like this:

    delete visibleObject;



_rootEntity is root entity defined in cpp code. Scene defined in QML file using 
Scene3D:

     Scene3D {
         id: scene
         anchors.fill: parent
         aspects: ["render", "logic", "input"]

         entity: rootEntity
     }

And _rootEntity passed like this:

context->setContextProperty("rootEntity", _rootEntity);

If it is necessary I can prepare simple example that reproduce issue.

Thanks.



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