Quick3D Texture might not capture the latest state of sourceItem

    property bool red3D: false

    Shortcut {
        sequence: "R"
        onActivated: {
            root.red3D = !root.red3D;
        }
    }

    View3D {
        width: 100
        height: 100

        OrthographicCamera {
            position: Qt.vector3d(0, 0, 100)
        }

        Model {
            source: "#Rectangle"
            materials: DefaultMaterial {
                lighting: DefaultMaterial.NoLighting
                diffuseMap: Texture {
                    sourceItem: Rectangle {
                        width: 100
                        height: 100
                        color: root.red3D ? "red" : "lightgray"
                    }
                }
            }
        }
    }