How to use the pythreejs.CylinderGeometry function in pythreejs

v_norm = v / l
    cyl_height = l - head_length
    z_rot = np.arccos(v_norm.dot(np.array([0.0, 1.0, 0.0])))
    y_rot = np.arctan2(v[2], v[0])
    
    cyl_center = start_vec + cyl_height/2 * v_norm
    head_center = start_vec + (cyl_height + head_length/2) * v_norm
    cyl_geom = pjs.CylinderGeometry(radiusTop=width, radiusBottom=width, height=cyl_height)
    cyl_mesh.geometry = cyl_geom
    cyl_mesh.material = pjs.MeshLambertMaterial(color=color)
    cyl_mesh.position = cyl_center.tolist()
    cyl_mesh.setRotationFromMatrix([1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0])
    cyl_mesh.rotateY(-y_rot)
    cyl_mesh.rotateZ(-z_rot)
    
    head_geom = pjs.CylinderGeometry(radiusTop=0.0, radiusBottom=head_width, height=head_length)
    head_mesh.geometry = head_geom
    head_mesh.material = pjs.MeshLambertMaterial(color=color)
    head_mesh.position = head_center.tolist()
    head_mesh.setRotationFromMatrix([1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0])
    head_mesh.rotateY(-y_rot)
    head_mesh.rotateZ(-z_rot)

def make_arrow(cyl_mesh, head_mesh, start_vec, end_vec, width, head_width, head_length, color):
    start_vec = np.array(start_vec)
    end_vec = np.array(end_vec)
    v = end_vec - start_vec
    l = np.sqrt(v.dot(v))
    v_norm = v / l
    cyl_height = l - head_length
    z_rot = np.arccos(v_norm.dot(np.array([0.0, 1.0, 0.0])))
    y_rot = np.arctan2(v[2], v[0])
    
    cyl_center = start_vec + cyl_height/2 * v_norm
    head_center = start_vec + (cyl_height + head_length/2) * v_norm
    cyl_geom = pjs.CylinderGeometry(radiusTop=width, radiusBottom=width, height=cyl_height)
    cyl_mesh.geometry = cyl_geom
    cyl_mesh.material = pjs.MeshLambertMaterial(color=color)
    cyl_mesh.position = cyl_center.tolist()
    cyl_mesh.setRotationFromMatrix([1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0])
    cyl_mesh.rotateY(-y_rot)
    cyl_mesh.rotateZ(-z_rot)
    
    head_geom = pjs.CylinderGeometry(radiusTop=0.0, radiusBottom=head_width, height=head_length)
    head_mesh.geometry = head_geom
    head_mesh.material = pjs.MeshLambertMaterial(color=color)
    head_mesh.position = head_center.tolist()
    head_mesh.setRotationFromMatrix([1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0])
    head_mesh.rotateY(-y_rot)
    head_mesh.rotateZ(-z_rot)