- Qt 6.4
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- 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 {
         id: mainWindow

         anchors.fill: parent

         View3D {
             id: view3D
             anchors.fill: parent
             camera: camera

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

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

             PointLight {
                 position: Qt.vector3d(400, 600, 400)
                 brightness: 80
                 ambientColor: Qt.rgba(0.3, 0.3, 0.3, 1.0)
             }

             Component {
                 id: particleComponent
                 Model {
                     source: "#Cube"
                     scale: Qt.vector3d(0.5, 0.5, 0.5)
                     materials: DefaultMaterial {
                     }
                 }
             }

             Component {
                 id: particleComponentStar
                 Model {
                     source: "#Rectangle"
                     scale: Qt.vector3d(0.1, 0.1, 0.0)
                     materials: DefaultMaterial {
                         diffuseMap: Texture {
                             source: "images/star2.png"
                         }
                     }
                 }
             }

             ParticleSystem3D {
                 id: psystem

                 // Particles
                 ModelParticle3D {
                     id: particleCube
                     delegate: particleComponent
                     maxAmount: 4
                     color: "#ffffff"
                     colorVariation: Qt.vector4d(0.4, 0.4, 0.4, 0.0)
                     unifiedColorVariation: true
                 }
                 ModelParticle3D {
                     id: particleSpark
                     delegate: particleComponentStar
                     maxAmount: 600
                     fadeInDuration: 200
                     fadeOutDuration: 500
                     color: "#ffffff"
                     colorVariation: Qt.vector4d(0.4, 0.4, 0.4, 0.8)
                     unifiedColorVariation: true

                 }
                 ModelParticle3D {
                     id: particleSpark2
                     delegate: particleComponentStar
                     maxAmount: 1000
                     fadeInDuration: 200
                     fadeOutDuration: 500
                     color: "#ff6060"
                     colorVariation: Qt.vector4d(0.5, 0.2, 0.2, 0.5)
                     unifiedColorVariation: true
                 }
                 ModelParticle3D {
                     id: particleStar
                     delegate: particleComponentStar
                     maxAmount: 1000
                     color: "#ffee60"
                     colorVariation: Qt.vector4d(0.6, 0.6, 0.2, 0.5)
                     unifiedColorVariation: true
                 }

                 ParticleEmitter3D {
                     particle: particleCube
                     position: Qt.vector3d(-550, -300, 0)
                     particleScaleVariation: 0.4
                     particleRotationVariation: Qt.vector3d(180, 180, 180)
                     particleRotationVelocityVariation: Qt.vector3d(200, 200, 200);
                     velocity: VectorDirection3D {
                         direction: Qt.vector3d(250, 400, 0)
                         directionVariation: Qt.vector3d(50, 50, 50)
                     }
                     emitRate: 1
                     lifeSpan: 4000
                 }

                 TrailEmitter3D {
                     id: trailEmitter
                     particle: particleSpark
                     follow: particleCube
                     particleScale: 1.5
                     particleScaleVariation: 0.5
                     particleRotationVariation: Qt.vector3d(20, 20, 180)
                     particleRotationVelocityVariation: Qt.vector3d(100, 100, 100);
                     velocity: VectorDirection3D {
                         directionVariation: Qt.vector3d(20, 20, 20)
                     }
                     emitRate: sliderEmitRate.sliderValue
                     lifeSpan: 1000
                 }

                 TrailEmitter3D {
                     id: trailEmitter2
                     particle: particleSpark2
                     follow: particleCube
                     particleScale: 2.5
                     particleScaleVariation: 0.5
                     particleRotationVariation: Qt.vector3d(20, 20, 180)
                     particleRotationVelocityVariation: Qt.vector3d(100, 100, 100);
                     velocity: VectorDirection3D {
                         directionVariation: Qt.vector3d(100, 100, 100)
                     }
                     lifeSpan: 1000
                 }

                 ParticleEmitter3D {
                     id: starEmitter
                     particle: particleStar
                     particleScale: 5.0
                     particleScaleVariation: 3.0
                     particleRotationVariation: Qt.vector3d(0, 0, 180)
                     particleRotationVelocityVariation: Qt.vector3d(100, 100, 100);
                     velocity: VectorDirection3D {
                         direction: Qt.vector3d(0, 500, 0)
                         directionVariation: Qt.vector3d(80, 80, 80)
                     }
                     lifeSpan: 1000
                 }

                 Gravity3D {
                     direction: Qt.vector3d(0, 1, 0)
                     magnitude: -200
                 }
             }
         }

         MouseArea {
             anchors.fill: parent
             onClicked: {
                 trailEmitter2.burst(50);
                 var pos = view3D.mapTo3DScene(Qt.vector3d(mouseX, mouseY, camera.z));
                 starEmitter.burst(sliderBurstAmount.sliderValue,
                                   sliderBurstDuration.sliderValue,
                                   pos);

             }
         }

         Text {
             anchors.centerIn: parent
             font.pointSize: settings.fontSizeLarge
             color: "#ffffff"
             text: qsTr("Click to burst!")
         }

         SettingsView {
             CustomLabel {
                 text: "Burst amount"
             }
             CustomSlider {
                 id: sliderBurstAmount
                 sliderValue: 100
                 fromValue: 10
                 toValue: 200
             }
             CustomLabel {
                 text: "Burst duration"
             }
             CustomSlider {
                 id: sliderBurstDuration
                 sliderValue: 100
                 fromValue: 0
                 toValue: 1000
             }
             CustomLabel {
                 text: "Trail emitRate"
             }
             CustomSlider {
                 id: sliderEmitRate
                 sliderValue: 100
                 fromValue: 0
                 toValue: 150
             }
         }

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