- Qt 6.5
- Qt Quick 3D
- Qt Quick 3D - Particles 3D Testbed Example
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Particles 3D Testbed Example

     // Copyright (C) 2021 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: settings.antialiasingMode
                 antialiasingQuality: settings.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 {
                 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: parent.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]
         }
     }