[
    {
        "id": "bush1",
        "primitive": "group",
        "children": ["bush2"]
    },
    {
        "id": "bush2",
        "primitive": "group",
        "children": ["bush3"]
    },
    {
        "id": "bush3",
        "primitive": "group",
        "children": ["bush1"]
    },
    {
        "id": "plants",
        "primitive": "layer",
        "color": [0,1,0],
        "elements": ["bush1"]
    }
]