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 {
         anchors.fill: parent

         environment: SceneEnvironment {
             clearColor: "#101010"
             backgroundMode: SceneEnvironment.Color
             antialiasingMode: AppSettings.antialiasingMode
             antialiasingQuality: AppSettings.antialiasingQuality
         }

         PerspectiveCamera {
             id: camera
             position: Qt.vector3d(0, 100, 600)
             clipFar: 2000
         }

         PointLight {
             position: Qt.vector3d(200, 600, 400)
             brightness: 40
             ambientColor: Qt.rgba(0.2, 0.2, 0.2, 1.0)
         }

         Model {
             source: "#Rectangle"
             y: -200
             scale: Qt.vector3d(30, 15, 15)
             eulerRotation.x: -90
             materials: [
                 DefaultMaterial {
                     diffuseColor: Qt.rgba(1.0, 1.0, 1.0, 1.0)
                 }
             ]
         }

         Node {
             id: rotatingNode
             position.y: 150
             position.z: -200
             NumberAnimation on eulerRotation.y {
                 running: true
                 loops: Animation.Infinite
                 from: 0
                 to: 360
                 duration: 10000
             }
             Model {
                 x: 300
                 source: "#Cube"
                 scale: Qt.vector3d(1.5, 1.5, 1.5)
                 materials: DefaultMaterial {
                     diffuseColor: Qt.rgba(0.9, 0.9, 0.6, 1.0)
                 }
                 eulerRotation.x: rotatingNode.eulerRotation.y
                 eulerRotation.z: 20
             }
             Model {
                 x: -300
                 source: "#Sphere"
                 scale: Qt.vector3d(2.5, 2.5, 2.5)
                 materials: DefaultMaterial {
                     diffuseColor: Qt.rgba(0.9, 0.6, 0.6, 1.0)
                     opacity: 0.4
                 }
             }
         }

         ParticleSystem3D {
             id: psystem

             // Start so that the snowing is in full steam
             startTime: 15000

             SpriteParticle3D {
                 id: snowParticle
                 sprite: Texture {
                     source: "images/snowflake.png"
                 }
                 maxAmount: 1500 * sliderIntensity.sliderValue
                 color: "#ffffff"
                 colorVariation: Qt.vector4d(0.0, 0.0, 0.0, 0.5);
                 fadeInDuration: 1000
                 fadeOutDuration: 1000
             }

             ParticleEmitter3D {
                 id: emitter
                 particle: snowParticle
                 position: Qt.vector3d(0, 1000, -350)
                 depthBias: -100
                 scale: Qt.vector3d(15.0, 0.0, 15.0)
                 shape: ParticleShape3D {
                     type: ParticleShape3D.Sphere
                 }
                 particleRotationVariation: Qt.vector3d(180, 180, 180)
                 particleRotationVelocityVariation: Qt.vector3d(50, 50, 50);
                 particleScale: 2.0
                 particleScaleVariation: 0.5;
                 velocity: VectorDirection3D {
                     direction: Qt.vector3d(0, sliderVelocityY.sliderValue, 0)
                     directionVariation: Qt.vector3d(0, sliderVelocityY.sliderValue * 0.4, 0)
                 }
                 emitRate: sliderEmitRate.sliderValue * sliderIntensity.sliderValue
                 lifeSpan: 15000
             }

             Wander3D {
                 enabled: checkBoxWanderEnabled.checked
                 globalAmount: Qt.vector3d(sliderWanderGlobalAmount.sliderValue, 0, sliderWanderGlobalAmount.sliderValue)
                 globalPace: Qt.vector3d(sliderWanderGlobalPace.sliderValue, 0, sliderWanderGlobalPace.sliderValue)
                 uniqueAmount: Qt.vector3d(sliderWanderUniqueAmount.sliderValue, 0, sliderWanderUniqueAmount.sliderValue)
                 uniquePace: Qt.vector3d(sliderWanderUniquePace.sliderValue, 0, sliderWanderUniquePace.sliderValue)
                 uniqueAmountVariation: sliderWanderUniqueAmountVariation.sliderValue
                 uniquePaceVariation: sliderWanderUniquePaceVariation.sliderValue
             }
             PointRotator3D {
                 enabled: checkBoxRotatorEnabled.checked
                 pivotPoint: Qt.vector3d(0, 0, -350)
                 direction: Qt.vector3d(0, 1, 0)
                 magnitude: sliderRotatorMagnitude.sliderValue
             }
         }
     }

     SettingsView {
         CustomLabel {
             text: "Intensity of snowfall"
         }
         CustomSlider {
             id: sliderIntensity
             sliderValue: 5
             fromValue: 1
             toValue: 20
         }
         CustomLabel {
             text: "Emit Rate"
         }
         CustomSlider {
             id: sliderEmitRate
             sliderValue: 50
             fromValue: 1
             toValue: 100
         }
         CustomLabel {
             text: "Start Velocity Y"
         }
         CustomSlider {
             id: sliderVelocityY
             sliderValue: -100
             fromValue: -50
             toValue: -500
         }
         CustomLabel {
             text: "System Rotation"
         }
         CustomSlider {
             id: sliderRotation
             sliderValue: 0
             fromValue: -90
             toValue: 90
             onSliderValueChanged: {
                 psystem.eulerRotation.z = sliderValue;
             }
         }
         CustomCheckBox {
             id: checkBoxWanderEnabled
             text: "Wander: enabled"
             checked: true
         }
         CustomLabel {
             text: "Wander: globalAmount"
         }
         CustomSlider {
             id: sliderWanderGlobalAmount
             sliderValue: 50
             fromValue: 0
             toValue: 100
         }
         CustomLabel {
             text: "Wander: globalPace"
         }
         CustomSlider {
             id: sliderWanderGlobalPace
             sliderValue: 0.2
             fromValue: 0
             toValue: 2.0
         }
         CustomLabel {
             text: "Wander: uniqueAmount"
         }
         CustomSlider {
             id: sliderWanderUniqueAmount
             sliderValue: 50
             fromValue: 0
             toValue: 100
         }
         CustomLabel {
             text: "Wander: uniquePace"
         }
         CustomSlider {
             id: sliderWanderUniquePace
             sliderValue: 0.2
             fromValue: 0
             toValue: 2.0
         }
         CustomLabel {
             text: "Wander: uniqueAmountVariation"
         }
         CustomSlider {
             id: sliderWanderUniqueAmountVariation
             sliderValue: 0.5
             fromValue: 0.0
             toValue: 1.0
         }
         CustomLabel {
             text: "Wander: uniquePaceVariation"
         }
         CustomSlider {
             id: sliderWanderUniquePaceVariation
             sliderValue: 0.5
             fromValue: 0.0
             toValue: 1.0
         }
         CustomCheckBox {
             id: checkBoxRotatorEnabled
             text: "PointRotator: enabled"
             checked: true
         }
         CustomLabel {
             text: "PointRotator: magnitude"
         }
         CustomSlider {
             id: sliderRotatorMagnitude
             sliderValue: 0.0
             fromValue: -100.0
             toValue: 100.0
         }
     }

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