Qt Quick 3D - 动态模型创建范例

演示动态模型的创建。

This example demonstrates creating models dynamically in an application. 10 models are created dynamically at the start of the application, and more can be added or removed using the Add Model and Remove Model buttons. Dynamic model count is limited to 100 in this example, but that is in no way a limitation of QtQuick3D .

设置

卵生节点

We are going to need a Node to hold the dynamically created models.

Node {
    id: shapeSpawner
    property real range: 300
    property var instances: []
    readonly property int maxInstances: 100
    function addOrRemove(add) {
    ...

Startup

We're creating 10 models at Component.onCompleted to avoid opening into an empty view.

Component.onCompleted: {
    // Create 10 instances to get started
    for (var i = 0; i < 10; ++i)
        shapeSpawner.addOrRemove(true);
}

动态模型

The addOrRemove() function called during startup can add or remove the models.

添加模型

A model component is created using the Qt.createComponent function, and instantiated with 位置 and scale parameters using the createObject 函数。

// Create a new weirdShape at random postion
var xPos = (2 * Math.random() * range) - range;
var yPos = (2 * Math.random() * range) - range;
var zPos = (2 * Math.random() * range) - range;
var weirdShapeComponent = Qt.createComponent("WeirdShape.qml");
let instance = weirdShapeComponent.createObject(
        shapeSpawner, { "x": xPos, "y": yPos, "z": zPos,
            "scale": Qt.vector3d(0.25, 0.25, 0.25)});
instances.push(instance);

移除模型

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

// Remove last item in instances list
let instance = instances.pop();
instance.destroy();

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