- Qt 5.15
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - Dynamic Model Creation Example
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Dynamic Model Creation Example

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     import QtQuick 2.15
     import QtQuick.Window 2.14
     import QtQuick.Controls 2.14
     import QtQuick3D 1.15

     Window {
         id: window
         width: 1280
         height: 720
         visible: true
         title: "Dynamic Model Creation example"

         Button {
             id: addButton
             anchors.left: parent.left
             anchors.top: parent.top
             anchors.margins: 20
             text: "Add Model"
             implicitWidth: 150

             background: Rectangle {
                 implicitWidth: 150
                 implicitHeight: 40
                 opacity: enabled ? 1 : 0.3
                 color: parent.down ? "#6b7080" : "#848895"
                 border.color: "#222840"
                 border.width: 1
                 radius: 5
             }

             onClicked: {
                 if (shapeSpawner.instances.length < shapeSpawner.maxInstances)
                     shapeSpawner.addOrRemove(true);
             }
         }

         Label {
             id: countLabel
             anchors.top: parent.top
             anchors.horizontalCenter: parent.horizontalCenter
             anchors.margins: 20
             font.pointSize: 20
             font.bold: true
             color: "#848895"
         }

         Button {
             id: removeButton
             anchors.right: parent.right
             anchors.top: parent.top
             anchors.margins: 20
             text: "Remove Model"
             implicitWidth: 150

             background: Rectangle {
                 implicitWidth: 150
                 implicitHeight: 40
                 opacity: enabled ? 1 : 0.3
                 color: parent.down ? "#6b7080" : "#848895"
                 border.color: "#222840"
                 border.width: 1
                 radius: 5
             }

             onClicked: {
                 if (shapeSpawner.instances.length > 0)
                     shapeSpawner.addOrRemove(false);
             }
         }

         View3D {
             anchors.fill: parent
             camera: camera
             renderMode: View3D.Underlay

             environment: SceneEnvironment {
                 clearColor: "black"
                 backgroundMode: SceneEnvironment.Color
                 antialiasingMode: SceneEnvironment.MSAA
                 antialiasingQuality: SceneEnvironment.High
             }

             PointLight {
                 position: Qt.vector3d(0, 0, 0);
                 brightness: 1500
             }

             Node {
                 position: Qt.vector3d(0, 0, 0);

                 PerspectiveCamera {
                     position: Qt.vector3d(0, 0, 600)
                 }

                 eulerRotation.y: -90

                 SequentialAnimation on eulerRotation.y {
                     loops: Animation.Infinite
                     PropertyAnimation {
                         duration: 5000
                         to: 360
                         from: 0
                     }
                 }
             }

             Node {
                 id: shapeSpawner
                 property real range: 300
                 property var instances: []
                 readonly property int maxInstances: 100

                 function addOrRemove(add) {
                     if (add) {
                         // 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);
                         if (instances.length === maxInstances)
                             addButton.enabled = false;
                         else if (instances.length > 0)
                             removeButton.enabled = true;
                     } else {
                         // Remove last item in instances list
                         let instance = instances.pop();
                         instance.destroy();
                         if (instances.length === 0)
                             removeButton.enabled = false;
                         else if (instances.length < maxInstances)
                             addButton.enabled = true;
                     }
                     countLabel.text = "Models in Scene: " + instances.length;
                 }
             }

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