Rotate 3D Model

nothing

I had a custom QML object "Model.qml" to load and rotate 3D model.

Entity {
id: root
property Material material
property alias myRoll : transform.rollAngle
components: [ transform, mesh, root.material ]
Transform {
    id: transform
    objectName: "MyModel"
    property real rollAngle : 0
    property real pitchAngle : 20
    Translate { id: translation }
    Scale { id: scaleTransform }
    Rotate { 
        objectName: "rotateRoll"
        axis : Qt.vector3d(1, 0, 0)
        angle : transform.rollAngle
    }
}
Mesh {
    id: mesh
    source: "qrc:/3dmodel/Drone.obj"
}
}

And in drone.cpp i update property "rollAngle" to rotate model whenever this property changed but it doesn't work anyway. Here is the code I use to update "rollAngle"

QQmlEngine engine;
QQmlComponent component(&engine, QUrl("qrc:/src/Model.qml"));
QObject *object = component.create();    
QObject *rotateObject = object->findChild<QObject *>("rotateRoll");  
rotateObject->setProperty("angle", this->roll);    
qDebug() << "Property value:" << rotateObject->property("angle").toFloat();
engine.destroyed();

"rollAngle" changes but 3D model doesn't rotate. I use SequenceAnimation instead but it can't run too. Can anyone give me some advice?

Thks.

p3c0

Hi @nothing and Welcome
One thing I have noticed is you dont set a visual parent to the object that you create using component.create(). It can be done using setParentItem. For that you will ned to cast it to QQuickItem. I dont know that will make your problem solve but it is something that should be done.

P.S: I have formatted your code by adding tags. You can edit the post to see how it is done.

nothing

Hi @p3c0 ,

Can you give some tutorial about "set visual parent" or a simple example, I'm confuse how to apply this into my codes.

P.S: Thks for editing my post :)

p3c0

@nothing Can you post your complete code ? I tried the same with this example (http://doc.qt.io/qt-5/qt3drenderer-simple-qml-example.html) and it worked. However I was not able to use your example. Loading Model.qml in QQmlComponent didn't work.

nothing

@p3c0 I dont use setProperty anymore. I create Q_PROPERTY attribute roll in Drone.h that links to attribute roll of object Model.qml and set rootContext to Drone. Then Q_EMIT the function rollchange() notify with roll (in Drone.h) and the Rotate object in Model.qml we change to drone.roll . And finally it works :)

p3c0

@nothing Congratulations and thanks for sharing :)