Qt Quick 3D - Custom Instanced Rendering | Qt Quick 3D 6.5.3
Description: Demonstrates instancing with custom materials and a C++ instance table.

- Qt 6.5
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - Custom Instanced Rendering
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Custom Instanced Rendering

     // Copyright (C) 2020 The Qt Company Ltd.
     // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

     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
             }
         }
     }