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

     readonly property real fireStrength: sliderFireStrength.sliderValue
     readonly property real smokeStrength: sliderSmokeStrength.sliderValue
     readonly property real sparklesStrength: sliderSparklesStrength.sliderValue

     anchors.fill: parent

     View3D {
         anchors.fill: parent

         environment: SceneEnvironment {
             clearColor: "#000000"
             backgroundMode: SceneEnvironment.Color
             antialiasingMode: AppSettings.antialiasingMode
             antialiasingQuality: AppSettings.antialiasingQuality
         }

         PerspectiveCamera {
             id: camera
             position: Qt.vector3d(0, 100, 300)
         }

         // Light following the fire
         PointLight {
             id: pointLight
             property real animatedBrightness: 0.1
             position: fireEmitter.position
             brightness: 0.04 * mainWindow.smokeStrength + 0.4 * mainWindow.fireStrength + animatedBrightness * mainWindow.sparklesStrength;
             // Add some liveness to the light
             SequentialAnimation{
                 loops: Animation.Infinite
                 running: true
                 NumberAnimation {
                     target: pointLight
                     property: "animatedBrightness"
                     to: 0.12
                     duration: 1000
                     easing.type: Easing.OutElastic
                 }
                 NumberAnimation {
                     target: pointLight
                     property: "animatedBrightness"
                     to: 0.05
                     duration: 1500
                     easing.type: Easing.InOutQuad
                 }
                 NumberAnimation {
                     target: pointLight
                     property: "animatedBrightness"
                     to: 0.1
                     duration: 2500
                     easing.type: Easing.InElastic
                 }
             }
         }

         // Background walls & floor
         Node {
             id: background
             visible: checkBoxBackground.checked
             Model {
                 source: "#Rectangle"
                 position: Qt.vector3d(200, 0, -300)
                 scale: Qt.vector3d(10.0, 10.0, 0.0)
                 materials: DefaultMaterial {
                     diffuseColor: "#204020"
                 }
             }
             Model {
                 source: "#Rectangle"
                 position: Qt.vector3d(200, -100, -300)
                 eulerRotation.x: -90
                 scale: Qt.vector3d(10.0, 10.0, 0.0)
                 materials: DefaultMaterial {
                     diffuseColor: "#204020"
                 }
             }
             Model {
                 source: "#Rectangle"
                 position: Qt.vector3d(-300, 0, -200)
                 eulerRotation.y: 90
                 scale: Qt.vector3d(10.0, 10.0, 0.0)
                 materials: DefaultMaterial {
                     diffuseColor: "#204020"
                 }
             }
         }

         ParticleSystem3D {
             id: psystem

             SpriteParticle3D {
                 id: particleFire
                 sprite: Texture {
                     source: "images/sphere.png"
                 }
                 colorTable: Texture {
                     source: "images/colorTable.png"
                 }
                 maxAmount: 300
                 color: "#ffffff"
                 colorVariation: Qt.vector4d(0.0, 0.6, 0.8, 0.0)
                 billboard: true
                 blendMode: SpriteParticle3D.Screen
                 fadeInDuration: 100
             }

             ParticleEmitter3D {
                 id: fireEmitter
                 particle: particleFire
                 particleScale: 4
                 particleEndScale: 12
                 particleScaleVariation: 3
                 particleEndScaleVariation: 5
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 20 + mainWindow.fireStrength, 0)
                     directionVariation: Qt.vector3d(10 + mainWindow.fireStrength * 0.2, 10, 0)
                 }
                 emitRate: mainWindow.fireStrength * 2
                 lifeSpan: 1000
                 lifeSpanVariation: 500
                 // Animate the fire position
                 SequentialAnimation on x {
                     paused: !checkBoxAnimate.checked
                     loops: Animation.Infinite
                     NumberAnimation {
                         to: 100
                         duration: 2500
                         easing.type: Easing.InOutQuad
                     }
                     NumberAnimation {
                         to: -100
                         duration: 2500
                         easing.type: Easing.InOutQuad
                     }
                 }
             }

             SpriteParticle3D {
                 id: particleSparkle
                 sprite: Texture {
                     source: "images/sphere.png"
                 }
                 colorTable: Texture {
                     source: "images/color_table3.png"
                 }
                 maxAmount: 400
                 colorVariation: Qt.vector4d(0.0, 0.0, 0.0, 0.4)
                 blendMode: SpriteParticle3D.Screen
             }

             ParticleEmitter3D {
                 id: sparklesEmitter
                 particle: particleSparkle
                 position: fireEmitter.position
                 particleScale: 1.0
                 particleEndScale: 0
                 particleScaleVariation: 0.5
                 particleRotationVariation: Qt.vector3d(180, 180, 0)
                 particleRotationVelocityVariation: Qt.vector3d(400, 400, 0)
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 50 + mainWindow.sparklesStrength, 0)
                     directionVariation: Qt.vector3d(50, 10 + mainWindow.sparklesStrength * 0.5, 0)
                 }
                 emitRate: mainWindow.sparklesStrength * 4
                 lifeSpan: 500
                 lifeSpanVariation: 500
             }

             SpriteParticle3D {
                 id: smokeParticle
                 sprite: Texture {
                     source: "images/smoke_sprite.png"
                 }
                 maxAmount: 200
                 spriteSequence: SpriteSequence3D {
                     frameCount: 15
                     interpolate: true
                 }
                 billboard: true
                 color: "#40ffffff"
                 colorVariation: Qt.vector4d(0.5, 0.5, 0.5, 0.2)
                 unifiedColorVariation: true
                 fadeOutEffect: Particle3D.FadeOpacity
                 fadeOutDuration: 1500
             }

             ParticleEmitter3D {
                 id: smokeEmitter
                 particle: smokeParticle
                 // Smoke always behind the fire & sparkles
                 position: Qt.vector3d(fireEmitter.position.x, fireEmitter.position.y, fireEmitter.position.z - 2)
                 particleScale: 6
                 particleScaleVariation: 4
                 particleEndScale: 35
                 particleEndScaleVariation: 15
                 particleRotationVariation: Qt.vector3d(0, 0, 180)
                 particleRotationVelocityVariation: Qt.vector3d(0, 0, 40)
                 emitRate: mainWindow.smokeStrength * 0.5
                 lifeSpan: 3000
                 lifeSpanVariation: 1000
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, 50 + mainWindow.smokeStrength * 0.1, 0)
                     directionVariation: Qt.vector3d(20, 20, 0)
                 }
             }

             Gravity3D {
                 // Add gravity to sparkles
                 particles: [ particleSparkle ]
                 magnitude: 200
             }
         }
     }

     SettingsView {
         CustomLabel {
             text: "Fire Strength"
         }
         CustomSlider {
             id: sliderFireStrength
             sliderValue: 50
             fromValue: 0
             toValue: 100
         }
         CustomLabel {
             text: "Smoke Strength"
         }
         CustomSlider {
             id: sliderSmokeStrength
             sliderValue: 50
             fromValue: 0
             toValue: 100
         }
         CustomLabel {
             text: "Sparkles Strength"
         }
         CustomSlider {
             id: sliderSparklesStrength
             sliderValue: 50
             fromValue: 0
             toValue: 100
         }
         CustomCheckBox {
             id: checkBoxBackground
             text: "Show Background"
             checked: true
         }
         CustomCheckBox {
             id: checkBoxAnimate
             text: "Animate Position"
             checked: true
         }
     }

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