How to use the pyrender.quaternion.from_pitch function in pyrender

def build_scene(colors, floor_textures, wall_textures, objects):
    scene = Scene(
        bg_color=np.array([153 / 255, 226 / 255, 249 / 255]),
        ambient_light=np.array([0.5, 0.5, 0.5, 1.0]))

    floor_trimesh = trimesh.load("objects/floor.obj")
    mesh = Mesh.from_trimesh(floor_trimesh)
    node = Node(
        mesh=mesh,
        rotation=pyrender.quaternion.from_pitch(-math.pi / 2),
        translation=np.array([0, 0, 0]))
    texture_path = random.choice(floor_textures)
    set_random_texture(node, texture_path, intensity=0.8)
    scene.add_node(node)

    texture_path = random.choice(wall_textures)

    wall_trimesh = trimesh.load("objects/wall.obj")
    mesh = Mesh.from_trimesh(wall_trimesh)
    node = Node(mesh=mesh, translation=np.array([0, 1.15, -3.5]))
    set_random_texture(node, texture_path)
    scene.add_node(node)

    mesh = Mesh.from_trimesh(wall_trimesh)
    node = Node(
        mesh=mesh,

def genearte_camera_quaternion(yaw, pitch):
    quaternion_yaw = pyrender.quaternion.from_yaw(yaw)
    quaternion_pitch = pyrender.quaternion.from_pitch(pitch)
    quaternion = pyrender.quaternion.multiply(quaternion_pitch, quaternion_yaw)
    quaternion = quaternion / np.linalg.norm(quaternion)
    return quaternion

def Cylinder():
    sphere = trimesh.creation.cylinder(radius=0.25, height=0.75)
    mesh = Mesh.from_trimesh(sphere, smooth=True)
    node = Node(
        mesh=mesh,
        rotation=quaternion.from_pitch(math.pi / 2),
        translation=np.array([0, 0.375, 0]))
    return node

def build_scene(floor_textures, wall_textures, fix_light_position=False):
    scene = Scene(
        bg_color=np.array([153 / 255, 226 / 255, 249 / 255]),
        ambient_light=np.array([0.5, 0.5, 0.5, 1.0]))

    floor_trimesh = trimesh.load("{}/floor.obj".format(object_directory))
    mesh = Mesh.from_trimesh(floor_trimesh, smooth=False)
    node = Node(
        mesh=mesh,
        rotation=pyrender.quaternion.from_pitch(-math.pi / 2),
        translation=np.array([0, 0, 0]))
    texture_path = random.choice(floor_textures)
    set_random_texture(node, texture_path)
    scene.add_node(node)

    texture_path = random.choice(wall_textures)

    wall_trimesh = trimesh.load("{}/wall.obj".format(object_directory))
    mesh = Mesh.from_trimesh(wall_trimesh, smooth=False)
    node = Node(mesh=mesh, translation=np.array([0, 1.15, -3.5]))
    set_random_texture(node, texture_path)
    scene.add_node(node)

    mesh = Mesh.from_trimesh(wall_trimesh, smooth=False)
    node = Node(
        mesh=mesh,