Qt Quick 3D - Custom Instanced Rendering

 /****************************************************************************
 **
 ** Copyright (C) 2020 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
 import QtQuick3D
 import InstancingExample

 Window {
     id: window
     width: 1280
     height: 720
     visible: true

     View3D {
         id: view
         anchors.fill: parent

         environment: SceneEnvironment {
             clearColor: "#8fafff"
             backgroundMode: SceneEnvironment.Color
         }

         Node {
             id: cameraNode
             PerspectiveCamera {
                 property vector3d basePos: Qt.vector3d(0, 0, 750)
                 property vector3d halfZoomPos: Qt.vector3d(0, -300, 400)
                 property vector3d zoomPos: Qt.vector3d(0, -300, 100)
                 property vector3d otherZoomPos: Qt.vector3d(-200, -300, 400)
                 id: camera
                 position: basePos
                 eulerRotation.x: -20
             }
         }

         property int zoomDuration: 4000
         property int rotationDuration: 7000

         SequentialAnimation {
             running: true
             PauseAnimation { duration: 1000 }
             NumberAnimation {
                 from: 0; to: 90
                 target: cameraNode; property: "eulerRotation.y"
                 duration: view.rotationDuration
             }

             PauseAnimation { duration: 500 }
             Vector3dAnimation {
                 from: camera.basePos; to: camera.halfZoomPos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }
             Vector3dAnimation {
                 from: camera.halfZoomPos; to: camera.zoomPos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }
             PauseAnimation { duration: 1000 }
             Vector3dAnimation {
                 from: camera.zoomPos; to: camera.basePos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }

             PauseAnimation { duration: 500 }
             NumberAnimation {
                 from: 90; to: 180
                 target: cameraNode; property: "eulerRotation.y"
                 duration: view.rotationDuration
             }

             PauseAnimation { duration: 500 }
             Vector3dAnimation {
                 from: camera.basePos; to: camera.halfZoomPos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }
             Vector3dAnimation {
                 from: camera.halfZoomPos; to: camera.zoomPos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }
             PauseAnimation { duration: 1000 }
             Vector3dAnimation {
                 from: camera.zoomPos; to: camera.basePos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }

             PauseAnimation { duration: 500 }
             NumberAnimation {
                 from: 180; to: 360
                 target: cameraNode; property: "eulerRotation.y"
                 duration: view.rotationDuration
             }

             PauseAnimation { duration: 500 }
             Vector3dAnimation {
                 from: camera.basePos; to: camera.otherZoomPos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }
             PauseAnimation { duration: 1000 }
             Vector3dAnimation {
                 from: camera.otherZoomPos; to: camera.basePos
                 target: camera; property: "position"
                 duration: view.zoomDuration
             }

             loops: Animation.Infinite
         }

         DirectionalLight {
             eulerRotation.x: 250
             eulerRotation.y: -30
             brightness: 1.0
             ambientColor: "#7f7f7f"
         }

         CustomMaterial {
             id: cubeMaterial
             property real uTime: 0
             NumberAnimation on uTime {
                 from: 0
                 to: 1000000
                 duration: 1000000
                 loops: Animation.Infinite
             }
             vertexShader: "cubeMaterial.vert"
             fragmentShader: "cubeMaterial.frag"
         }

         Model {
             id: instancedCube
             property real cubeSize: 15
             scale: Qt.vector3d(cubeSize/100, cubeSize/100, cubeSize/100)
             source: "#Cube"
             instancing: CppInstanceTable {
                 gridSize: 65
                 gridSpacing: instancedCube.cubeSize
                 randomSeed: 1522562186
             }
             materials: cubeMaterial
         }
     }
 }