def process_carla_scene(scene, data, max_timesteps, scene_config):
for node_id in pd.unique(data['node_id']):
# What is this?
node_frequency_multiplier = 1
node_df = data[data['node_id'] == node_id].copy()
if node_df['x'].shape[0] < 2:
continue
if not np.all(np.diff(node_df['frame_id']) == 1):
global occlusion
occlusion += 1
logging.info("Occlusion")
occl_count = np.diff(node_df['frame_id'])
logging.info(occl_count)
# plot_occlusion(scene, data, node_df, occl_count)
continue # TODO Make better
if node_df.iloc[0][
'type'] == scene_config.node_type.VEHICLE and not node_id == 'ego':
x, y = node_df['x'].values, node_df['y'].values
curvature, pl, _ = trajectory_curvature(np.stack((x, y), axis=-1))
if pl < 1.0: # vehicle is "not" moving
node_df[['x', 'y', 'heading']] = node_df[['x', 'y',
'heading']].values[0]
node_df[['v_x', 'v_y', 'a_x', 'a_y']] = 0.
global total
global curv_0_2
global curv_0_1
total += 1
if pl > 1.0:
if curvature > .2:
curv_0_2 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_2))
elif curvature > .1:
curv_0_1 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_1))
x, y = node_df['x'].values, node_df['y'].values
# Use derivatives instead
# v_x, v_y = node_df['v_x'].values, node_df['v_y'].values
# a_x, a_y = node_df['a_x'].values, node_df['a_y'].values
v_x = derivative_of(x, scene.dt)
v_y = derivative_of(y, scene.dt)
a_x = derivative_of(v_x, scene.dt)
a_y = derivative_of(v_y, scene.dt)
if node_df.iloc[0]['type'] == scene_config.node_type.VEHICLE:
v = np.stack((
v_x,
v_y,
), axis=-1)
a = np.stack((
a_x,
a_y,
), axis=-1)
v_norm = np.linalg.norm(v, axis=-1)
a_norm = np.linalg.norm(a, axis=-1)
_v_norm = np.linalg.norm(v, axis=-1, keepdims=True)
heading_v = np.divide(v,
_v_norm,
out=np.zeros_like(v),
where=(_v_norm > 1.))
heading_x = heading_v[:, 0]
heading_y = heading_v[:, 1]
heading = node_df['heading'].values
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): v_x,
('velocity', 'y'): v_y,
('velocity', 'norm'): v_norm,
('acceleration', 'x'): a_x,
('acceleration', 'y'): a_y,
('acceleration', 'norm'): a_norm,
('heading', 'x'): heading_x,
('heading', 'y'): heading_y,
('heading', '°'): heading,
('heading', 'd°'): derivative_of(heading,
scene.dt,
radian=True)
}
node_data = pd.DataFrame(data_dict, columns=data_columns_vehicle)
else:
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): v_x,
('velocity', 'y'): v_y,
('acceleration', 'x'): a_x,
('acceleration', 'y'): a_y
}
node_data = pd.DataFrame(data_dict,
columns=data_columns_pedestrian)
node = Node(node_type=node_df.iloc[0]['type'],
node_id=node_id,
data=node_data,
frequency_multiplier=node_frequency_multiplier)
node.first_timestep = node_df['frame_id'].iloc[0]
if node_df.iloc[0]['robot'] == True:
node.is_robot = True
scene.robot = node
scene.nodes.append(node)
return scene
def process_trajectron_scene(scene, data, max_timesteps, scene_config):
for node_id in pd.unique(data['node_id']):
node_frequency_multiplier = 1
node_df = data[data['node_id'] == node_id]
if node_df['x'].shape[0] < 2:
continue
if not np.all(np.diff(node_df['frame_id']) == 1):
global occlusion
occlusion += 1
logging.info("Occlusion")
occl_count = np.diff(node_df['frame_id'])
logging.info(occl_count)
# plot_occlusion(scene, data, node_df, occl_count)
continue # TODO Make better
node_values = node_df[['x', 'y']].values
x = node_values[:, 0]
y = node_values[:, 1]
heading = node_df['heading'].values
if node_df.iloc[0][
'type'] == scene_config.node_type.VEHICLE and not node_id == 'ego':
# Kalman filter Agent
vx = derivative_of(x, scene.dt)
vy = derivative_of(y, scene.dt)
velocity = np.linalg.norm(np.stack((vx, vy), axis=-1), axis=-1)
filter_veh = NonlinearKinematicBicycle(dt=scene.dt,
sMeasurement=1.0)
P_matrix = None
for i in range(len(x)):
if i == 0: # initalize KF
# initial P_matrix
P_matrix = np.identity(4)
elif i < len(x):
# assign new est values
x[i] = x_vec_est_new[0][0]
y[i] = x_vec_est_new[1][0]
heading[i] = x_vec_est_new[2][0]
velocity[i] = x_vec_est_new[3][0]
if i < len(x) - 1: # no action on last data
# filtering
x_vec_est = np.array([[x[i]], [y[i]], [heading[i]],
[velocity[i]]])
z_new = np.array([[x[i + 1]], [y[i + 1]], [heading[i + 1]],
[velocity[i + 1]]])
x_vec_est_new, P_matrix_new = filter_veh.predict_and_update(
x_vec_est=x_vec_est,
u_vec=np.array([[0.], [0.]]),
P_matrix=P_matrix,
z_new=z_new)
P_matrix = P_matrix_new
curvature, pl, _ = trajectory_curvature(np.stack((x, y), axis=-1))
if pl < 1.0: # vehicle is "not" moving
x = x[0].repeat(max_timesteps + 1)
y = y[0].repeat(max_timesteps + 1)
heading = heading[0].repeat(max_timesteps + 1)
global total
global curv_0_2
global curv_0_1
total += 1
if pl > 1.0:
if curvature > .2:
curv_0_2 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_2))
elif curvature > .1:
curv_0_1 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_1))
vx = derivative_of(x, scene.dt)
vy = derivative_of(y, scene.dt)
ax = derivative_of(vx, scene.dt)
ay = derivative_of(vy, scene.dt)
if node_df.iloc[0]['type'] == scene_config.node_type.VEHICLE:
v = np.stack((vx, vy), axis=-1)
v_norm = np.linalg.norm(np.stack((vx, vy), axis=-1),
axis=-1,
keepdims=True)
heading_v = np.divide(v,
v_norm,
out=np.zeros_like(v),
where=(v_norm > 1.))
heading_x = heading_v[:, 0]
heading_y = heading_v[:, 1]
data_dict = {
('position', 'x'):
x,
('position', 'y'):
y,
('velocity', 'x'):
vx,
('velocity', 'y'):
vy,
('velocity', 'norm'):
np.linalg.norm(np.stack((vx, vy), axis=-1), axis=-1),
('acceleration', 'x'):
ax,
('acceleration', 'y'):
ay,
('acceleration', 'norm'):
np.linalg.norm(np.stack((ax, ay), axis=-1), axis=-1),
('heading', 'x'):
heading_x,
('heading', 'y'):
heading_y,
('heading', '°'):
heading,
('heading', 'd°'):
derivative_of(heading, dt, radian=True)
}
node_data = pd.DataFrame(data_dict, columns=data_columns_vehicle)
else:
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): vx,
('velocity', 'y'): vy,
('acceleration', 'x'): ax,
('acceleration', 'y'): ay
}
node_data = pd.DataFrame(data_dict,
columns=data_columns_pedestrian)
node = Node(node_type=node_df.iloc[0]['type'],
node_id=node_id,
data=node_data,
frequency_multiplier=node_frequency_multiplier)
node.first_timestep = node_df['frame_id'].iloc[0]
if node_df.iloc[0]['robot'] == True:
node.is_robot = True
scene.robot = node
scene.nodes.append(node)
return scene
env = Environment(node_type_list=['PARTICLE'], standardization=standardization)
attention_radius = dict()
attention_radius[(env.NodeType.PARTICLE, env.NodeType.PARTICLE)] = 10.0
env.attention_radius = attention_radius
env.robot_type = env.NodeType.PARTICLE
scenes = []
data_dict_path = os.path.join('../processed', '_'.join([desired_source, data_class]) + '_2_robot.pkl')
# open dataset
for scenario in dataset[data_class]:
max_timesteps = len(scenario[0][('position', 'x')])
scene = Scene(timesteps=max_timesteps, dt=dt, name=desired_source + "_" + data_class)
for node_id, data_dict in enumerate(scenario):
node_data = pd.DataFrame(data_dict, columns=data_columns)
node = Node(node_type=env.NodeType.PARTICLE, node_id=node_id, data=node_data)
node.first_timestep = 0
if node_id == 0:
node.is_robot = True
scene.robot = node
scene.nodes.append(node)
scenes.append(scene)
print(f'Processed {len(scenes):.2f} scene for data class {data_class}')
env.scenes = scenes
if len(scenes) > 0:
with open(data_dict_path, 'wb') as f:
dill.dump(env, f, protocol=dill.HIGHEST_PROTOCOL)
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): vx,
('velocity', 'y'): vy,
('acceleration', 'x'): ax,
('acceleration', 'y'): ay
}
node_data = pd.DataFrame(data_dict,
columns=data_columns)
node = Node(node_type=env.NodeType.PEDESTRIAN,
node_id=node_id,
data=node_data)
node.first_timestep = new_first_idx
scene.nodes.append(node)
if data_class == 'train':
scene.augmented = list()
angles = np.arange(
0, 360, 15) if data_class == 'train' else [0]
for angle in angles:
scene.augmented.append(augment_scene(scene, angle))
print(scene)
scenes.append(scene)
print(f'Processed {len(scenes):.2f} scene for data class {data_class}')
env.scenes = scenes
def process_scene(sample_token, processed_sample_tokens, env, nusc, helper,
data_path, data_class, half_dt, dynamic):
data = pd.DataFrame(columns=[
'frame_id', 'type', 'node_id', 'robot', 'x', 'y', 'z', 'length',
'width', 'height', 'heading'
])
samples = aggregate_samples(nusc,
start=sample_token,
data_class=data_class)
attribute_dict = defaultdict(set)
frame_id = 0
for sample in samples:
annotation_tokens = sample['anns']
for annotation_token in annotation_tokens:
annotation = nusc.get('sample_annotation', annotation_token)
category = annotation['category_name']
if len(annotation['attribute_tokens']):
attribute = nusc.get('attribute',
annotation['attribute_tokens'][0])['name']
else:
if 'vehicle' in category:
attribute = ''
else:
continue
if 'pedestrian' in category and 'stroller' not in category and 'wheelchair' not in category:
our_category = env.NodeType.PEDESTRIAN
elif 'vehicle' in category and 'bicycle' not in category and 'motorcycle' not in category: # and 'parked' not in attribute:
our_category = env.NodeType.VEHICLE
else:
continue
attribute_dict[annotation['instance_token']].add(attribute)
data_point = pd.Series({
'frame_id':
frame_id,
'type':
our_category,
'node_id':
annotation['instance_token'],
'robot':
False,
'x':
annotation['translation'][0],
'y':
annotation['translation'][1],
'z':
annotation['translation'][2],
'length':
annotation['size'][0],
'width':
annotation['size'][1],
'height':
annotation['size'][2],
'heading':
Quaternion(annotation['rotation']).yaw_pitch_roll[0]
})
data = data.append(data_point, ignore_index=True)
# Ego Vehicle
our_category = env.NodeType.VEHICLE
sample_data = nusc.get('sample_data', sample['data']['CAM_FRONT'])
annotation = nusc.get('ego_pose', sample_data['ego_pose_token'])
data_point = pd.Series({
'frame_id':
frame_id,
'type':
our_category,
'node_id':
'ego',
'robot':
True,
'x':
annotation['translation'][0],
'y':
annotation['translation'][1],
'z':
annotation['translation'][2],
'length':
4,
'width':
1.7,
'height':
1.5,
'heading':
Quaternion(annotation['rotation']).yaw_pitch_roll[0],
'orientation':
None
})
data = data.append(data_point, ignore_index=True)
processed_sample_tokens.add(sample['token'])
frame_id += 1
if len(data.index) == 0:
return None
data.sort_values('frame_id', inplace=True)
max_timesteps = data['frame_id'].max()
x_min = np.round(data['x'].min() - 50)
x_max = np.round(data['x'].max() + 50)
y_min = np.round(data['y'].min() - 50)
y_max = np.round(data['y'].max() + 50)
data['x'] = data['x'] - x_min
data['y'] = data['y'] - y_min
scene = Scene(timesteps=max_timesteps + 1,
dt=dt,
name=sample_token,
aug_func=augment,
sample_tokens=[sample['token'] for sample in samples],
x_min=x_min,
y_min=y_min)
# Generate Maps
map_name = helper.get_map_name_from_sample_token(sample_token)
nusc_map = NuScenesMap(dataroot=data_path, map_name=map_name)
type_map = dict()
x_size = x_max - x_min
y_size = y_max - y_min
patch_box = (x_min + 0.5 * (x_max - x_min), y_min + 0.5 * (y_max - y_min),
y_size, x_size)
patch_angle = 0 # Default orientation where North is up
canvas_size = (np.round(3 * y_size).astype(int),
np.round(3 * x_size).astype(int))
homography = np.array([[3., 0., 0.], [0., 3., 0.], [0., 0., 3.]])
layer_names = [
'lane', 'road_segment', 'drivable_area', 'road_divider',
'lane_divider', 'stop_line', 'ped_crossing', 'stop_line',
'ped_crossing', 'walkway'
]
map_mask = (nusc_map.get_map_mask(patch_box, patch_angle, layer_names,
canvas_size) * 255.0).astype(np.uint8)
map_mask = np.swapaxes(map_mask, 1, 2) # x axis comes first
# PEDESTRIANS
map_mask_pedestrian = np.stack(
(map_mask[9], map_mask[8], np.max(map_mask[:3], axis=0)), axis=0)
type_map['PEDESTRIAN'] = GeometricMap(data=map_mask_pedestrian,
homography=homography,
description=', '.join(layer_names))
# VEHICLES
map_mask_vehicle = np.stack(
(np.max(map_mask[:3], axis=0), map_mask[3], map_mask[4]), axis=0)
type_map['VEHICLE'] = GeometricMap(data=map_mask_vehicle,
homography=homography,
description=', '.join(layer_names))
map_mask_plot = np.stack(
((np.max(map_mask[:3], axis=0) -
(map_mask[3] + 0.5 * map_mask[4]).clip(max=255)).clip(min=0).astype(
np.uint8), map_mask[8], map_mask[9]),
axis=0)
type_map['VISUALIZATION'] = GeometricMap(
data=map_mask_plot,
homography=homography,
description=', '.join(layer_names))
scene.map = type_map
del map_mask
del map_mask_pedestrian
del map_mask_vehicle
del map_mask_plot
for node_id in pd.unique(data['node_id']):
node_frequency_multiplier = 1
node_df = data[data['node_id'] == node_id]
if dynamic:
if 'vehicle.parked' in attribute_dict[
node_id] or 'vehicle.stopped' in attribute_dict[node_id]:
continue
elif len(attribute_dict[node_id]
) == 1 and 'vehicle.parked' in attribute_dict[node_id]:
# Catching instances of vehicles that were parked and then moving, but not allowing
# only parked vehicles through.
continue
if node_df['x'].shape[0] < 2:
continue
if not np.all(np.diff(node_df['frame_id']) == 1):
min_index = node_df['frame_id'].min()
max_index = node_df['frame_id'].max()
node_df = node_df.set_index('frame_id').reindex(
range(min_index, max_index + 1)).interpolate().reset_index()
node_df['type'] = node_df['type'].mode()[0]
node_df['node_id'] = node_id
node_df['robot'] = False
# print('Occlusion')
# continue # TODO Make better
node_values = node_df[['x', 'y']].values
x = node_values[:, 0]
y = node_values[:, 1]
heading = node_df['heading'].values
if node_df.iloc[0][
'type'] == env.NodeType.VEHICLE and not node_id == 'ego':
# Kalman filter Agent
vx = derivative_of(x, scene.dt)
vy = derivative_of(y, scene.dt)
velocity = np.linalg.norm(np.stack((vx, vy), axis=-1), axis=-1)
filter_veh = NonlinearKinematicBicycle(dt=scene.dt,
sMeasurement=1.0)
P_matrix = None
for i in range(len(x)):
if i == 0: # initalize KF
# initial P_matrix
P_matrix = np.identity(4)
elif i < len(x):
# assign new est values
x[i] = x_vec_est_new[0][0]
y[i] = x_vec_est_new[1][0]
heading[i] = x_vec_est_new[2][0]
velocity[i] = x_vec_est_new[3][0]
if i < len(x) - 1: # no action on last data
# filtering
x_vec_est = np.array([[x[i]], [y[i]], [heading[i]],
[velocity[i]]])
z_new = np.array([[x[i + 1]], [y[i + 1]], [heading[i + 1]],
[velocity[i + 1]]])
x_vec_est_new, P_matrix_new = filter_veh.predict_and_update(
x_vec_est=x_vec_est,
u_vec=np.array([[0.], [0.]]),
P_matrix=P_matrix,
z_new=z_new)
P_matrix = P_matrix_new
curvature, pl, _ = trajectory_curvature(np.stack((x, y), axis=-1))
if pl < 1.0: # vehicle is "not" moving
x = x[0].repeat(max_timesteps + 1)
y = y[0].repeat(max_timesteps + 1)
heading = heading[0].repeat(max_timesteps + 1)
global total
global curv_0_2
global curv_0_1
total += 1
if pl > 1.0:
if curvature > .2:
curv_0_2 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_2))
elif curvature > .1:
curv_0_1 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_1))
if half_dt:
t_old = np.linspace(0, 1, x.shape[0])
t_new = np.linspace(0, 1, 2 * x.shape[0])
x = np.interp(t_new, t_old, x)
y = np.interp(t_new, t_old, y)
heading = np.interp(
t_new, t_old, heading + np.pi, period=2 * np.pi) - np.pi
vx = derivative_of(x, scene.dt / 2)
vy = derivative_of(y, scene.dt / 2)
ax = derivative_of(vx, scene.dt / 2)
ay = derivative_of(vy, scene.dt / 2)
else:
vx = derivative_of(x, scene.dt)
vy = derivative_of(y, scene.dt)
ax = derivative_of(vx, scene.dt)
ay = derivative_of(vy, scene.dt)
if node_df.iloc[0]['type'] == env.NodeType.VEHICLE:
v = np.stack((vx, vy), axis=-1)
v_norm = np.linalg.norm(np.stack((vx, vy), axis=-1),
axis=-1,
keepdims=True)
heading_v = np.divide(v,
v_norm,
out=np.zeros_like(v),
where=(v_norm > 1.))
heading_x = heading_v[:, 0]
heading_y = heading_v[:, 1]
a_norm = np.divide(ax * vx + ay * vy,
v_norm[..., 0],
out=np.zeros_like(ax),
where=(v_norm[..., 0] > 1.))
if half_dt:
d_heading = derivative_of(heading, scene.dt / 2, radian=True)
else:
d_heading = derivative_of(heading, scene.dt, radian=True)
data_dict = {
('position', 'x'):
x,
('position', 'y'):
y,
('velocity', 'x'):
vx,
('velocity', 'y'):
vy,
('velocity', 'norm'):
np.linalg.norm(np.stack((vx, vy), axis=-1), axis=-1),
('acceleration', 'x'):
ax,
('acceleration', 'y'):
ay,
('acceleration', 'norm'):
a_norm,
('heading', 'x'):
heading_x,
('heading', 'y'):
heading_y,
('heading', '°'):
heading,
('heading', 'd°'):
d_heading
}
node_data = pd.DataFrame(data_dict, columns=data_columns_vehicle)
else:
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): vx,
('velocity', 'y'): vy,
('acceleration', 'x'): ax,
('acceleration', 'y'): ay
}
node_data = pd.DataFrame(data_dict,
columns=data_columns_pedestrian)
node = Node(node_type=node_df.iloc[0]['type'],
node_id=0 if node_id == 'ego' else abs(hash(node_id)),
data=node_data,
frequency_multiplier=node_frequency_multiplier,
description=node_id)
node.first_timestep = node_df['frame_id'].iloc[0]
if half_dt:
node.first_timestep *= 2
if node_df.iloc[0]['robot'] == True:
node.is_robot = True
scene.robot = node
scene.nodes.append(node)
if half_dt:
# We are interpolating to make the overall dt half of what it was.
scene.dt /= 2.0
scene.timesteps *= 2
return scene
def process_carla_scene(scene, data, max_timesteps, scene_config):
for node_id in pd.unique(data['node_id']):
# What is this?
node_frequency_multiplier = 1
node_df = data[data['node_id'] == node_id].copy()
if node_df['x'].shape[0] < 2:
continue
if not np.all(np.diff(node_df['frame_id']) == 1):
"""When there is occlusion, then take the longest
subsequence of consecutive vehicle observations."""
global occlusion
occlusion += 1
# plot_occlusion(scene, data, node_df, occl_count)
s, sz = util.longest_consecutive_increasing_subsequence(
node_df['frame_id'].values)
logging.debug(
f"Found an occlusion by node {node_id} in scene {scene.name}.")
logging.debug(f"List of frame_id is {node_df['frame_id'].values}")
occl_count = np.diff(node_df['frame_id'])
logging.debug(
f"np.diff() on frame_id is {occl_count}; longest sequence is {sz}"
)
if sz < 2:
continue
node_df = node_df[s].copy()
logging.debug(
f"Sequence of frame_id is {node_df['frame_id'].values}")
node_df['frame_id'] = np.arange(sz)
if node_df.iloc[0][
'type'] == scene_config.node_type.VEHICLE and not node_id == 'ego':
x, y = node_df['x'].values, node_df['y'].values
curvature, pl, _ = trajectory_curvature(np.stack((x, y), axis=-1))
global total
global curv_0_2
global curv_0_1
total += 1
if pl > 1.0:
if curvature > .2:
curv_0_2 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_2))
elif curvature > .1:
curv_0_1 += 1
node_frequency_multiplier = 3 * int(
np.floor(total / curv_0_1))
x, y = node_df['x'].values, node_df['y'].values
v_x = derivative_of(x, scene.dt)
v_y = derivative_of(y, scene.dt)
a_x = derivative_of(v_x, scene.dt)
a_y = derivative_of(v_y, scene.dt)
if node_df.iloc[0]['type'] == scene_config.node_type.VEHICLE:
v = np.stack((
v_x,
v_y,
), axis=-1)
a = np.stack((
a_x,
a_y,
), axis=-1)
v_norm = np.linalg.norm(v, axis=-1)
a_norm = np.linalg.norm(a, axis=-1)
heading = node_df['heading'].values
heading = (heading + np.pi) % (2.0 * np.pi) - np.pi
heading_x, heading_y = np.cos(heading), np.sin(heading)
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): v_x,
('velocity', 'y'): v_y,
('velocity', 'norm'): v_norm,
('acceleration', 'x'): a_x,
('acceleration', 'y'): a_y,
('acceleration', 'norm'): a_norm,
('heading', 'x'): heading_x,
('heading', 'y'): heading_y,
('heading', '°'): heading,
('heading', 'd°'): derivative_of(heading,
scene.dt,
radian=True)
}
node_data = pd.DataFrame(data_dict, columns=data_columns_vehicle)
else:
data_dict = {
('position', 'x'): x,
('position', 'y'): y,
('velocity', 'x'): v_x,
('velocity', 'y'): v_y,
('acceleration', 'x'): a_x,
('acceleration', 'y'): a_y
}
node_data = pd.DataFrame(data_dict,
columns=data_columns_pedestrian)
node = Node(node_type=node_df.iloc[0]['type'],
node_id=node_id,
data=node_data,
frequency_multiplier=node_frequency_multiplier)
node.first_timestep = node_df['frame_id'].iloc[0]
if node_df.iloc[0]['robot'] == True:
node.is_robot = True
scene.robot = node
scene.nodes.append(node)
return scene