使用 Quick3D Particles 实现雨滴效果

// Rain particle
LineParticle3D {
    id: rainParticle
    ...
}

Component {
    id: modelComponent
    Model {
        // The mesh containing only the top parts of the sphere
        source: "meshes/sphere_top.mesh"
    }
}

// Rain particle emitter
ParticleEmitter3D {
    id: emitter
    particle: rainParticle
    reversed: true
    shape: ParticleModelShape3D {
        model: modelComponent
        fill: false
    }
    velocity: VectorDirection3D {
        direction: Qt.vector3d(0, 800, 0)
        directionVariation: Qt.vector3d(2, 0, 2)
    }
}

// Splash particle
SpriteParticle3D {
    id: splashParticle
    ...
}

// Splash particle trail emitter following the rain particle
TrailEmitter3D {
    follow: rainParticle
    DynamicBurst3D {
        id: splashBurst
        amount: 20
        amountVariation: 2
        triggerMode: DynamicBurst3D.TriggerEnd
    }
    emitBursts: splashBurst
    particle: splashParticle
    velocity: VectorDirection3D {
        direction: Qt.vector3d(0, 0, 10)
        directionVariation: Qt.vector3d(50, 50, 1)
    }
}

TrailEmitter3D {
    ...
    emitMode: ParticleEmitter3D.SurfaceReflected
}

ParticleEmitter3D {
        id: emitter
        shape: ParticleSceneShape3D {
            id: sceneShape
            scene: sceneRoot
            sceneCenter: Qt.vector3d(0, 0, 0)
            sceneExtents: Qt.vector3d(1000, 500, 1000)
            excludedNodes: [debugNode]
            shapeResolution: 50
        }
    }

    Model {
        id: debugNode
        geometry: sceneShape.geometry
    }