Qt Quick 3D - Particles 3D Testbed Example

 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 import QtQuick
 import QtQuick3D
 import QtQuick3D.Particles3D

 Item {
     id: mainWindow

     anchors.fill: parent

     View3D {
         anchors.fill: parent

         environment: SceneEnvironment {
             clearColor: "#202020"
             backgroundMode: SceneEnvironment.Color
             antialiasingMode: AppSettings.antialiasingMode
             antialiasingQuality: AppSettings.antialiasingQuality
         }

         PerspectiveCamera {
             id: camera
             position: Qt.vector3d(0, 100, 600)

             SequentialAnimation {
                 running: true
                 loops: Animation.Infinite
                 NumberAnimation {
                     target: camera
                     property: "eulerRotation.x"
                     to: -90
                     duration: 20000
                     easing.type: Easing.Linear
                 }
                 NumberAnimation {
                     target: camera
                     property: "eulerRotation.x"
                     to: 0
                     duration: 2000
                     easing.type: Easing.Linear
                 }
             }

             SequentialAnimation {
                 running: true
                 loops: Animation.Infinite
                 NumberAnimation {
                     target: camera
                     property: "position.y"
                     to: 1400
                     duration: 20000
                     easing.type: Easing.Linear
                 }
                 NumberAnimation {
                     target: camera
                     property: "position.y"
                     to: 0
                     duration: 2000
                     easing.type: Easing.Linear
                 }
             }

             SequentialAnimation {
                 running: true
                 loops: Animation.Infinite
                 NumberAnimation {
                     target: camera
                     property: "position.z"
                     to: 0
                     duration: 20000
                     easing.type: Easing.Linear
                 }
                 NumberAnimation {
                     target: camera
                     property: "position.z"
                     to: 600
                     duration: 2000
                     easing.type: Easing.Linear
                 }
             }
         }

         PointLight {
             position: Qt.vector3d(0, 400, 100)
             brightness: 10
             ambientColor: Qt.rgba(0.3, 0.3, 0.3, 1.0)
         }

         // Models shared between particles
         Component {
             id: particleComponent
             Model {
                 source: "#Cone"
                 scale: Qt.vector3d(0.1, 0.1, 0.1)
                 materials: DefaultMaterial {
                 }
             }
         }

         ParticleSystem3D {
             id: psystem

             // Particles
             ModelParticle3D {
                 id: particleVelocity
                 delegate: particleComponent
                 maxAmount: 250
                 color: "#ff0000"
                 alignMode: Particle3D.AlignTowardsStartVelocity
             }

             ModelParticle3D {
                 id: particleCamera
                 delegate: particleComponent
                 maxAmount: 250
                 color: "#00ff00"
                 alignMode: Particle3D.AlignTowardsTarget
                 alignTargetPosition: camera.position
             }

             ModelParticle3D {
                 id: particleNoAlign
                 delegate: particleComponent
                 maxAmount: 250
                 color: "#0000ff"
             }

             SpriteParticle3D {
                 id: particleBillboard
                 sprite: Texture {
                     source: "images/snowflake.png"
                 }
                 maxAmount: 250
                 color: "#ffffff"
                 billboard: true
             }

             SpriteParticle3D {
                 id: particleNoBillboard
                 sprite: Texture {
                     source: "images/snowflake.png"
                 }
                 maxAmount: 250
                 color: "#aaaaff"
             }

             // Emitters, one per particle
             ParticleEmitter3D {
                 particle: particleVelocity
                 position: Qt.vector3d(400, 50, 0)
                 particleScale: 2
                 particleRotation: Qt.vector3d(90, 0, 0)
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 100, 0)
                     directionVariation: Qt.vector3d(30, 30, 30)
                 }
                 emitRate: 10
                 lifeSpan: 4000
                 Node {
                     x: 20
                     Text {
                         anchors.verticalCenter: parent.verticalCenter
                         text: "StartVelocity"
                         font.pointSize: AppSettings.fontSizeLarge
                         color: "#ffffff"
                     }
                 }
             }

             ParticleEmitter3D {
                 particle: particleCamera
                 position: Qt.vector3d(200, 50, 0)
                 particleScale: 2
                 particleRotation: Qt.vector3d(90, 0, 0)
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 100, 0)
                     directionVariation: Qt.vector3d(30, 30, 30)
                 }
                 emitRate: 10
                 lifeSpan: 4000
                 Node {
                     x: 20
                     Text {
                         anchors.verticalCenter: parent.verticalCenter
                         text: "Camera"
                         font.pointSize: AppSettings.fontSizeLarge
                         color: "#ffffff"
                     }
                 }
             }

             ParticleEmitter3D {
                 particle: particleNoAlign
                 position: Qt.vector3d(0, 50, 0)
                 particleScale: 2
                 particleRotation: Qt.vector3d(90, 0, 0)
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 100, 0)
                     directionVariation: Qt.vector3d(30, 30, 30)
                 }
                 emitRate: 10
                 lifeSpan: 4000
                 Node {
                     x: 20
                     Text {
                         anchors.verticalCenter: parent.verticalCenter
                         text: "NoAlign"
                         font.pointSize: AppSettings.fontSizeLarge
                         color: "#ffffff"
                     }
                 }
             }

             ParticleEmitter3D {
                 particle: particleBillboard
                 position: Qt.vector3d(-200, 50, 0)
                 particleScale: 8
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 100, 0)
                     directionVariation: Qt.vector3d(30, 30, 30)
                 }
                 emitRate: 10
                 lifeSpan: 4000
                 Node {
                     x: 20
                     Text {
                         anchors.verticalCenter: parent.verticalCenter
                         text: "Billboard"
                         font.pointSize: AppSettings.fontSizeLarge
                         color: "#ffffff"
                     }
                 }
             }

             ParticleEmitter3D {
                 particle: particleNoBillboard
                 position: Qt.vector3d(-400, 50, 0)
                 particleScale: 8
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 100, 0)
                     directionVariation: Qt.vector3d(30, 30, 30)
                 }
                 emitRate: 10
                 lifeSpan: 4000
                 Node {
                     x: 20
                     Text {
                         anchors.verticalCenter: parent.verticalCenter
                         text: "NoBillboard"
                         font.pointSize: AppSettings.fontSizeLarge
                         color: "#ffffff"
                     }
                 }
             }
         }
     }

     LoggingView {
         anchors.bottom: parent.bottom
         particleSystems: [psystem]
     }
 }