**Animation and Modern App Design: Creating a 3D Cube Demo** In this example, we will explore the art of modern app design using Qt Quick and 3D animations. We'll create a 3D cube demo with PyQt6, showcasing a mesmerizing animation that puts the cube in action. ```python # cube.py import sys from PyQt6.QtCore import QObject, pyqtProperty, pyqtSlot from PyQt6.QtGui import QMatrix4x4 from PyQt6.QtQuick import QQuickView from PyQt6.QtGui import QGuiApplication class Cube(QObject): def __init__(self, parent=None): super().__init__(parent) self._angle = 0.0 @pyqtProperty(float) def angle(self): return self._angle def _set_angle(self, angle): self._angle = angle self.angleChanged.emit() def rotate(self): self._set_angle(self.angle + 10) self.angleChanged.emit() angleChanged = pyqtSignal() # Register the Cube object QObject.register_qmetatype(Cube) ``` ```qml // main.qml import QtQuick 2.15 import QtQuick3D 1.15 import QtQuick.Layouts import QtQuick.Controls ApplicationWindow { id: main title: "3D Cube Animation" width: 800 height: 800 visible: true // Create the cube Node { // Use the Cube object from our main file property Cube cube: Cube {} PerspectiveCamera { id: camera z: 600 } // Create the cube mesh Model { source: "#Cube" Scale3D { scale3D: Qt.vector3d(100, 100, 100) } opacity: 1.0 materials: [ DefaultMaterial { diffuseColor: "red" } ] // Animate the cube SequentialAnimation on eulerRotation.y { loops: Animation.Infinite NumberAnimation { from: 0; to: 360 duration: 8000 easing.type: Easing_cosineInOut } } SequentialAnimation on eulerRotation.x { loops: Animation.Infinite NumberAnimation { from: 0; to: 360 duration: 8000 easing.type: Easing_cosineInOut } } // Control the rotation speed using a slider RowLayout { anchors.top: parent.top Slider { id: slider onMoved: cube.rotate() } Label { text: "Rotation Speed" } } } } } // Create the cube mesh ``` ```python # main.py import sys from PyQt6.QtCore import QCoreApplication from PyQt6.QtGui import QGuiApplication from PyQt6.QtQuick import QQuickView from PyQt6.QtQuick import QQmlApplicationEngine from PyQt6.QtCore import QUrl from PyQt6.QtQuick import QQuickItem from PyQt6.QtQuick import QQuickView from PyQt6.QtQml import QQmlApplicationEngine from PyQt6.QtQml import qmlRegisterSingletonInstance # Import the cube from cube import Cube def main(): # Define the args args = sys.argv args.append("--style") QGuiApplication.setApplicationName("3D Cube") app = QGuiApplication(args) # Create the cube object cube = Cube() # Register the cube as a singleton qmlRegisterSingletonInstance(QUrl("qrc:///"), "com.cube.cube", 1, 0, Cube, cube) # View view = QQuickView() # Show view view.engine().rootContext().setContextProperty("appWindow", view) # Load qml view.setSource(QUrl("qrc:///main.qml")) # view.setResizeMode(QQuickView.SizeRootObjectToView) view.resize(800, 800) view.show() return app.exec() if __name__ == "__main__": main() ``` This code snippet showcases the beauty of 3D cube animations while highlighting the utility of Qt Quick and its ability to run seamlessly within Qt-based apps. **Do you find the concept of Animations, Modern App Design and 3D Graphics intriguing? Have you had any experience developing animations or applications using similar frameworks? Please do share your thoughts on this topic below.**