Qt Quick 3D - Dynamic Model Creation Example

 /****************************************************************************
 **
 ** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 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);
         }
     }
 }