Qt Quick 3D - Dynamic Model Creation Example

We are going to need a https:// to hold the dynamically created models.

Node {
    id: shapeSpawner
    property real range: 300
    property var instances: []
    property int count
    ...

We're creating 10 models at Component.onCompleted so the example shows something at startup.

Component.onCompleted: {
    for (var i = 0; i < 10; ++i)
        shapeSpawner.addShape()
}

In order to add a new item to the scene, we first use the https:// function to create a https:// for our model. Then we use the component's https:// function to instantiate the item, passing in the position and scale as parameters.

function addShape()
{
    var xPos = (2 * Math.random() * range) - range;
    var yPos = (2 * Math.random() * range) - range;
    var zPos = (2 * Math.random() * range) - range;
    var shapeComponent = Qt.createComponent("WeirdShape.qml");
    let instance = shapeComponent.createObject(shapeSpawner,
        { "x": xPos, "y": yPos, "z": zPos, "scale": Qt.vector3d(0.25, 0.25, 0.25)});
    instances.push(instance);
    count = instances.length
}

Dynamically created models are removed simply by popping and destroying them from the instance stack.

function removeShape()
{
    if (instances.length > 0) {
        let instance = instances.pop();
        instance.destroy();
        count = instances.length
    }
}

• dynamiccreation/CMakeLists.txt

• dynamiccreation/WeirdShape.qml

• dynamiccreation/dynamiccreation.pro

• dynamiccreation/main.cpp

• dynamiccreation/main.qml

• dynamiccreation/qml.qrc