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++ import QtQuick
++ import QtQuick3D
++
++ Item {
++ id: root
++ width: 640
++ height: 480
++ visible: true
++
++ property bool swapped: false
++
++ // The materials deliberately live outside the 3D scene, mimicking
++ // materials provided by e.g. a QML singleton. Their only scene manager
++ // reference comes from the model's materials assignment, so every swap
++ // destroys the backend node of the outgoing material and recreates it
++ // when it is assigned again.
++ CustomMaterial {
++ id: materialA
++ shadingMode: CustomMaterial.Shaded
++ property color baseColor: "red"
++ }
++
++ CustomMaterial {
++ id: materialB
++ shadingMode: CustomMaterial.Shaded
++ property color baseColor: "blue"
++ }
++
++ View3D {
++ anchors.fill: parent
++
++ environment: SceneEnvironment {
++ backgroundMode: SceneEnvironment.Color
++ clearColor: "black"
++ }
++
++ PerspectiveCamera {
++ z: 300
++ }
++
++ DirectionalLight {
++ castsShadow: true
++ eulerRotation.x: -45
++ }
++
++ Model {
++ source: "#Cube"
++ castsShadows: true
++ receivesShadows: true
++ materials: [ root.swapped ? materialB : materialA ]
++ }
++
++ Model {
++ source: "#Rectangle"
++ y: -80
++ scale: Qt.vector3d(5, 5, 5)
++ eulerRotation.x: -90
++ receivesShadows: true
++ materials: PrincipledMaterial { baseColor: "gray" }
++ }
++ }
++ }