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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ import QtQuick
++ import QtQuick3D
++ import QtQuick3D.Particles3D
++
++ Item {
++ id: root
++ width: 200
++ height: 200
++
++ View3D {
++ anchors.fill: parent
++
++ PerspectiveCamera { z: 600 }
++ DirectionalLight {}
++
++ // A running system assigned to a non-default content layer. The
++ // particles it produces should end up on the same layer.
++ ParticleSystem3D {
++ id: psystem
++ objectName: "psystem"
++ layers: ContentLayer.Layer2
++ // Pre-warm so particles are alive from the first rendered frame.
++ startTime: 1000
++
++ SpriteParticle3D {
++ id: sprite
++ objectName: "sprite"
++ color: "red"
++ maxAmount: 100
++ }
++
++ ParticleEmitter3D {
++ particle: sprite
++ emitRate: 50
++ lifeSpan: 5000
++ velocity: VectorDirection3D {
++ direction: Qt.vector3d(0, 100, 0)
++ }
++ }
++
++ // A compound delegate; the delegate is user content, so the
++ // system leaves its layers alone. Each model keeps its own
++ // assignment: one explicit, one the default.
++ ModelParticle3D {
++ id: modelParticle
++ objectName: "modelParticle"
++ maxAmount: 20
++ delegate: Node {
++ Model {
++ source: "#Cube"
++ layers: ContentLayer.Layer5
++ scale: Qt.vector3d(0.1, 0.1, 0.1)
++ materials: PrincipledMaterial { baseColor: "blue" }
++ }
++ Model {
++ source: "#Sphere"
++ // No explicit layers; stays on the default layer.
++ scale: Qt.vector3d(0.1, 0.1, 0.1)
++ materials: PrincipledMaterial { baseColor: "green" }
++ }
++ }
++ }
++
++ ParticleEmitter3D {
++ particle: modelParticle
++ emitRate: 10
++ lifeSpan: 5000
++ velocity: VectorDirection3D {
++ direction: Qt.vector3d(0, 100, 0)
++ }
++ }
++ }
++ }
++ }