def __init__(self, vtxs=None, parent=None, level=None):
        """Define vertices and edges to outline tree geometry."""
        if vtxs is None:
            vtxs = np.array([[0, 0, 0]])
        elif isinstance(vtxs, list):
            vtxs = np.array(vtxs)
        parent = [-1] * len(vtxs) if parent is None else parent
        level = [0] * len(vtxs) if level is None else level

        self.vtxs = vtxs
        self.parent = parent
        self.level = level
Define vertices and edges to outline tree geometry.
infinigen/assets/objects/trees/tree.py