Qt Quick 3D - Dynamic Model Creation Example

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 import QtQuick
 import QtQuick.Controls
 import QtQuick3D

 Window {
     id: window
     width: 1280
     height: 720
     visible: true
     color: "black"
     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: shapeSpawner.addShape()
     }

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

         text: "Models in Scene: " + shapeSpawner.count
     }

     Button {
         id: removeButton
         anchors.right: parent.right
         anchors.top: parent.top
         anchors.margins: 20
         text: "Remove Model"
         implicitWidth: 150
         enabled: shapeSpawner.count > 0

         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: shapeSpawner.removeShape()
     }

     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: 2.5
         }

         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: []
             property int count

             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
             }

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

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