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 {
     anchors.fill: parent

     View3D {
         id: view
         anchors.fill: parent

         PointLight {
             color: "white"
             ambientColor: "gray"
             brightness: 2.0
         }

         Model {
             source: "#Rectangle"
             eulerRotation: Qt.vector3d(-90, 0, 0)
             scale: Qt.vector3d(10, 10, 1)
             materials: [ DefaultMaterial {
                     diffuseColor: "red"
                 }
             ]
         }

         Model {
             source: "#Cube"
             scale: Qt.vector3d(0.3, 0.3, 0.3)
             materials: [DefaultMaterial {
                     diffuseColor: "white"
                 }
             ]
         }

         Component {
             id: particleComponent
             Model {
                 source: "#Cube"
                 scale: Qt.vector3d(0.1, 0.1, 0.1)
                 materials: PrincipledMaterial {
                     metalness: 0.5
                     roughness: 0
                     specularAmount: 1.0
                 }
                 opacity: 0.75
             }
         }

         ParticleSystem3D {
             id: psystem

             ModelParticle3D {
                 id: modelParticle
                 delegate: particleComponent
                 maxAmount: 60
                 color: Qt.rgba(0.5, 0.5, 0.5, 0.5)
                 colorVariation: Qt.vector4d(0.5, 0.5, 0.5, 0.15)
                 sortMode: sortModeSelectionBox.index
             }

             SpriteParticle3D {
                 id: spriteParticle
                 color: Qt.rgba(0.75, 0.75, 0.75, 0.75)
                 colorVariation: Qt.vector4d(0.5, 0.5, 0.5, 0.05)
                 maxAmount: 60
                 billboard: true
                 sortMode: sortModeSelectionBox.index
             }

             // Emitters, one per particle
             ParticleEmitter3D {
                 x: 35
                 particle: spriteParticle
                 particleScaleVariation: 0.3
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 5, 15)
                     directionVariation: Qt.vector3d(0, 0, 5)
                 }
                 emitRate: 10
                 lifeSpan: 6000
                 // Sort emitters based on camera rotation
                 depthBias: cameraController.rot - 180
             }
             ParticleEmitter3D {
                 x: -35
                 particle: modelParticle
                 particleScaleVariation: 0.2
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 5, 15)
                 }
                 emitRate: 10
                 lifeSpan: 6000
             }
         }

         Node {
             id: cameraController
             property real rot: 0.0
             PropertyAnimation {
                 target: cameraController
                 property: "rot"
                 from: 0.0
                 to: 360.0
                 duration: 10000
                 loops: Animation.Infinite
                 running: true
                 paused: !checkBoxRotateCamera.checked
             }
             eulerRotation: Qt.vector3d(0, rot, 0)
             PerspectiveCamera {
                 y: 20
                 z: 100
             }
         }

         environment: SceneEnvironment {
             clearColor: "darkGray"
             backgroundMode: SceneEnvironment.Color
         }
     }
     SettingsView {
         id: settingsView
         CustomSelectionBox {
             id: sortModeSelectionBox
             text: "Mode"
             values: ["SortNone", "SortNewest", "SortOldest", "SortDistance"]
             parentWidth: settingsView.width
         }
         CustomCheckBox {
             id: checkBoxRotateCamera
             text: "Rotate camera"
             checked: false
         }
     }
     LoggingView {
         anchors.bottom: parent.bottom
         particleSystems: [psystem]
     }
 }