ui_utils

Helper classes and functions for streamlining user interactions

CameraMover

A helper class for manipulating a camera via the keyboard. Utilizes carb keyboard callbacks to move the camera around.

Parameters:

Name	Type	Description	Default
cam	VisionSensor	The camera vision sensor to manipulate via the keyboard	required
delta	float	Change (m) per keypress when moving the camera	0.25
save_dir	str	Absolute path to where recorded images should be stored. Default is /imgs	f"{og.root_path}'/../images'"

Source code in omnigibson/utils/ui_utils.py

class CameraMover:
    """
    A helper class for manipulating a camera via the keyboard. Utilizes carb keyboard callbacks to move
    the camera around.

    Args:
        cam (VisionSensor): The camera vision sensor to manipulate via the keyboard
        delta (float): Change (m) per keypress when moving the camera
        save_dir (str): Absolute path to where recorded images should be stored. Default is <OMNIGIBSON_PATH>/imgs
    """
    def __init__(self, cam, delta=0.25, save_dir=f"{og.root_path}/../images"):
        self.cam = cam
        self.delta = delta
        self.light_val = gm.FORCE_LIGHT_INTENSITY
        self.save_dir = save_dir

        self._appwindow = omni.appwindow.get_default_app_window()
        self._input = carb.input.acquire_input_interface()
        self._keyboard = self._appwindow.get_keyboard()
        self._sub_keyboard = self._input.subscribe_to_keyboard_events(self._keyboard, self._sub_keyboard_event)

    def set_save_dir(self, save_dir):
        """
        Sets the absolute path corresponding to the image directory where recorded images from this CameraMover
        should be saved

        Args:
            save_dir (str): Absolute path to where recorded images should be stored
        """
        self.save_dir = save_dir

    def change_light(self, delta):
        self.light_val += delta
        self.set_lights(self.light_val)

    def set_lights(self, intensity):
        from omni.isaac.core.utils.prims import get_prim_at_path
        world = get_prim_at_path("/World")
        for prim in world.GetChildren():
            for prim_child in prim.GetChildren():
                for prim_child_child in prim_child.GetChildren():
                    if "Light" in prim_child_child.GetPrimTypeInfo().GetTypeName():
                        prim_child_child.GetAttribute("intensity").Set(intensity)

    def print_info(self):
        """
        Prints keyboard command info out to the user
        """
        print("*" * 40)
        print("CameraMover! Commands:")
        print()
        print(f"\t Right Click + Drag: Rotate camera")
        print(f"\t W / S : Move camera forward / backward")
        print(f"\t A / D : Move camera left / right")
        print(f"\t T / G : Move camera up / down")
        print(f"\t 9 / 0 : Increase / decrease the lights")
        print(f"\t P : Print current camera pose")
        print(f"\t O: Save the current camera view as an image")

    def print_cam_pose(self):
        """
        Prints out the camera pose as (position, quaternion) in the world frame
        """
        print(f"cam pose: {self.cam.get_position_orientation()}")

    def get_image(self):
        """
        Helper function for quickly grabbing the currently viewed RGB image

        Returns:
            np.array: (H, W, 3) sized RGB image array
        """
        return self.cam.get_obs()["rgb"][:, :, :-1]

    def record_image(self, fpath=None):
        """
        Saves the currently viewed image and writes it to disk

        Args:
            fpath (None or str): If specified, the absolute fpath to the image save location. Default is located in
                self.save_dir
        """
        og.log.info("Recording image...")

        # Use default fpath if not specified
        if fpath is None:
            timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
            fpath = f"{self.save_dir}/og_{timestamp}.png"

        # Make sure save path directory exists, and then save the image to that location
        Path(Path(fpath).parent).mkdir(parents=True, exist_ok=True)
        Image.fromarray(self.get_image()).save(fpath)
        og.log.info(f"Saved current viewer camera image to {fpath}.")

    def record_trajectory(self, poses, fps, steps_per_frame=1, fpath=None):
        """
        Moves the viewer camera through the poses specified by @poses and records the resulting trajectory to an mp4
        video file on disk.

        Args:
            poses (list of 2-tuple): List of global (position, quaternion) values to set the viewer camera to defining
                this trajectory
            fps (int): Frames per second when recording this video
            steps_per_frame (int): How many sim steps should occur between each frame being recorded. Minimum and
                default is 1.
            fpath (None or str): If specified, the absolute fpath to the video save location. Default is located in
                self.save_dir
        """
        og.log.info("Recording trajectory...")

        # Use default fpath if not specified
        if fpath is None:
            timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
            fpath = f"{self.save_dir}/og_{timestamp}.mp4"

        # Make sure save path directory exists, and then create the video writer
        Path(Path(fpath).parent).mkdir(parents=True, exist_ok=True)
        video_writer = imageio.get_writer(fpath, fps=fps)

        # Iterate through all desired poses, and record the trajectory
        for i, (pos, quat) in enumerate(poses):
            self.cam.set_position_orientation(position=pos, orientation=quat)
            og.sim.step()
            if i % steps_per_frame == 0:
                video_writer.append_data(self.get_image())

        # Close writer
        video_writer.close()
        og.log.info(f"Saved camera trajectory video to {fpath}.")

    def record_trajectory_from_waypoints(self, waypoints, per_step_distance, fps, steps_per_frame=1, fpath=None):
        """
        Moves the viewer camera through the waypoints specified by @waypoints and records the resulting trajectory to
        an mp4 video file on disk.

        Args:
            waypoints (np.array): (n, 3) global position waypoint values to set the viewer camera to defining this trajectory
            per_step_distance (float): How much distance (in m) should be approximately covered per trajectory step.
                This will determine the path length between individual waypoints
            fps (int): Frames per second when recording this video
            steps_per_frame (int): How many sim steps should occur between each frame being recorded. Minimum and
                default is 1.
            fpath (None or str): If specified, the absolute fpath to the video save location. Default is located in
                self.save_dir
        """
        # Create splines and their derivatives
        n_waypoints = len(waypoints)
        if n_waypoints < 3:
            og.log.error("Cannot generate trajectory from waypoints with less than 3 waypoints!")
            return

        splines = [CubicSpline(range(n_waypoints), waypoints[:, i], bc_type='clamped') for i in range(3)]
        dsplines = [spline.derivative() for spline in splines]

        # Function help get arc derivative
        def arc_derivative(u):
            return np.sqrt(np.sum([dspline(u) ** 2 for dspline in dsplines]))

        # Function to help get interpolated positions
        def get_interpolated_positions(step):
            assert step < n_waypoints - 1
            dist = quad(func=arc_derivative, a=step, b=step + 1)[0]
            path_length = int(dist / per_step_distance)
            interpolated_points = np.zeros((path_length, 3))
            for i in range(path_length):
                curr_step = step + (i / path_length)
                interpolated_points[i, :] = np.array([spline(curr_step) for spline in splines])
            return interpolated_points

        # Iterate over all waypoints and infer the resulting trajectory, recording the resulting poses
        poses = []
        for i in range(n_waypoints - 1):
            positions = get_interpolated_positions(step=i)
            for j in range(len(positions) - 1):
                # Get direction vector from the current to the following point
                direction = positions[j + 1] - positions[j]
                direction = direction / np.linalg.norm(direction)
                # Infer tilt and pan angles from this direction
                xy_direction = direction[:2] / np.linalg.norm(direction[:2])
                z = direction[2]
                pan_angle = np.arctan2(-xy_direction[0], xy_direction[1])
                tilt_angle = np.arcsin(z)
                # Infer global quat orientation from these angles
                quat = T.euler2quat([np.pi / 2 - tilt_angle, 0.0, pan_angle])
                poses.append([positions[j], quat])

        # Record the generated trajectory
        self.record_trajectory(poses=poses, fps=fps, steps_per_frame=steps_per_frame, fpath=fpath)

    def set_delta(self, delta):
        """
        Sets the delta value (how much the camera moves with each keypress) for this CameraMover

        Args:
            delta (float): Change (m) per keypress when moving the camera
        """
        self.delta = delta

    def set_cam(self, cam):
        """
        Sets the active camera sensor for this CameraMover

        Args:
            cam (VisionSensor): The camera vision sensor to manipulate via the keyboard
        """
        self.cam = cam

    @property
    def input_to_function(self):
        """
        Returns:
            dict: Mapping from relevant keypresses to corresponding function call to use
        """
        return {
            carb.input.KeyboardInput.O: lambda: self.record_image(fpath=None),
            carb.input.KeyboardInput.P: lambda: self.print_cam_pose(),
            carb.input.KeyboardInput.KEY_9: lambda: self.change_light(delta=-2e4),
            carb.input.KeyboardInput.KEY_0: lambda: self.change_light(delta=2e4),
        }

    @property
    def input_to_command(self):
        """
        Returns:
            dict: Mapping from relevant keypresses to corresponding delta command to apply to the camera pose
        """
        return {
            carb.input.KeyboardInput.D: np.array([self.delta, 0, 0]),
            carb.input.KeyboardInput.A: np.array([-self.delta, 0, 0]),
            carb.input.KeyboardInput.W: np.array([0, 0, -self.delta]),
            carb.input.KeyboardInput.S: np.array([0, 0, self.delta]),
            carb.input.KeyboardInput.T: np.array([0, self.delta, 0]),
            carb.input.KeyboardInput.G: np.array([0, -self.delta, 0]),
        }

    def _sub_keyboard_event(self, event, *args, **kwargs):
        """
        Handle keyboard events. Note: The signature is pulled directly from omni.

        Args:
            event (int): keyboard event type
        """
        if event.type == carb.input.KeyboardEventType.KEY_PRESS \
                or event.type == carb.input.KeyboardEventType.KEY_REPEAT:

            if event.type == carb.input.KeyboardEventType.KEY_PRESS and event.input in self.input_to_function:
                self.input_to_function[event.input]()

            else:
                command = self.input_to_command.get(event.input, None)

                if command is not None:
                    # Convert to world frame to move the camera
                    transform = T.quat2mat(self.cam.get_orientation())
                    delta_pos_global = transform @ command
                    self.cam.set_position(self.cam.get_position() + delta_pos_global)

        return True

input_to_command property

Returns:

Name	Type	Description
dict		Mapping from relevant keypresses to corresponding delta command to apply to the camera pose

input_to_function property

Returns:

Name	Type	Description
dict		Mapping from relevant keypresses to corresponding function call to use

get_image()

Helper function for quickly grabbing the currently viewed RGB image

Returns:

Type	Description
	np.array: (H, W, 3) sized RGB image array

Source code in omnigibson/utils/ui_utils.py

def get_image(self):
    """
    Helper function for quickly grabbing the currently viewed RGB image

    Returns:
        np.array: (H, W, 3) sized RGB image array
    """
    return self.cam.get_obs()["rgb"][:, :, :-1]

print_cam_pose()

Prints out the camera pose as (position, quaternion) in the world frame

Source code in omnigibson/utils/ui_utils.py

def print_cam_pose(self):
    """
    Prints out the camera pose as (position, quaternion) in the world frame
    """
    print(f"cam pose: {self.cam.get_position_orientation()}")

print_info()

Prints keyboard command info out to the user

Source code in omnigibson/utils/ui_utils.py

def print_info(self):
    """
    Prints keyboard command info out to the user
    """
    print("*" * 40)
    print("CameraMover! Commands:")
    print()
    print(f"\t Right Click + Drag: Rotate camera")
    print(f"\t W / S : Move camera forward / backward")
    print(f"\t A / D : Move camera left / right")
    print(f"\t T / G : Move camera up / down")
    print(f"\t 9 / 0 : Increase / decrease the lights")
    print(f"\t P : Print current camera pose")
    print(f"\t O: Save the current camera view as an image")

record_image(fpath=None)

Saves the currently viewed image and writes it to disk

Parameters:

Name	Type	Description	Default
fpath	None or str	If specified, the absolute fpath to the image save location. Default is located in self.save_dir	None

Source code in omnigibson/utils/ui_utils.py

def record_image(self, fpath=None):
    """
    Saves the currently viewed image and writes it to disk

    Args:
        fpath (None or str): If specified, the absolute fpath to the image save location. Default is located in
            self.save_dir
    """
    og.log.info("Recording image...")

    # Use default fpath if not specified
    if fpath is None:
        timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
        fpath = f"{self.save_dir}/og_{timestamp}.png"

    # Make sure save path directory exists, and then save the image to that location
    Path(Path(fpath).parent).mkdir(parents=True, exist_ok=True)
    Image.fromarray(self.get_image()).save(fpath)
    og.log.info(f"Saved current viewer camera image to {fpath}.")

record_trajectory(poses, fps, steps_per_frame=1, fpath=None)

Moves the viewer camera through the poses specified by @poses and records the resulting trajectory to an mp4 video file on disk.

Parameters:

Name	Type	Description	Default
poses	list of 2-tuple	List of global (position, quaternion) values to set the viewer camera to defining this trajectory	required
fps	int	Frames per second when recording this video	required
steps_per_frame	int	How many sim steps should occur between each frame being recorded. Minimum and default is 1.	1
fpath	None or str	If specified, the absolute fpath to the video save location. Default is located in self.save_dir	None

Source code in omnigibson/utils/ui_utils.py

def record_trajectory(self, poses, fps, steps_per_frame=1, fpath=None):
    """
    Moves the viewer camera through the poses specified by @poses and records the resulting trajectory to an mp4
    video file on disk.

    Args:
        poses (list of 2-tuple): List of global (position, quaternion) values to set the viewer camera to defining
            this trajectory
        fps (int): Frames per second when recording this video
        steps_per_frame (int): How many sim steps should occur between each frame being recorded. Minimum and
            default is 1.
        fpath (None or str): If specified, the absolute fpath to the video save location. Default is located in
            self.save_dir
    """
    og.log.info("Recording trajectory...")

    # Use default fpath if not specified
    if fpath is None:
        timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
        fpath = f"{self.save_dir}/og_{timestamp}.mp4"

    # Make sure save path directory exists, and then create the video writer
    Path(Path(fpath).parent).mkdir(parents=True, exist_ok=True)
    video_writer = imageio.get_writer(fpath, fps=fps)

    # Iterate through all desired poses, and record the trajectory
    for i, (pos, quat) in enumerate(poses):
        self.cam.set_position_orientation(position=pos, orientation=quat)
        og.sim.step()
        if i % steps_per_frame == 0:
            video_writer.append_data(self.get_image())

    # Close writer
    video_writer.close()
    og.log.info(f"Saved camera trajectory video to {fpath}.")

record_trajectory_from_waypoints(waypoints, per_step_distance, fps, steps_per_frame=1, fpath=None)

Moves the viewer camera through the waypoints specified by @waypoints and records the resulting trajectory to an mp4 video file on disk.

Parameters:

Name	Type	Description	Default
waypoints	np.array	(n, 3) global position waypoint values to set the viewer camera to defining this trajectory	required
per_step_distance	float	How much distance (in m) should be approximately covered per trajectory step. This will determine the path length between individual waypoints	required
fps	int	Frames per second when recording this video	required
steps_per_frame	int	How many sim steps should occur between each frame being recorded. Minimum and default is 1.	1
fpath	None or str	If specified, the absolute fpath to the video save location. Default is located in self.save_dir	None

Source code in omnigibson/utils/ui_utils.py

def record_trajectory_from_waypoints(self, waypoints, per_step_distance, fps, steps_per_frame=1, fpath=None):
    """
    Moves the viewer camera through the waypoints specified by @waypoints and records the resulting trajectory to
    an mp4 video file on disk.

    Args:
        waypoints (np.array): (n, 3) global position waypoint values to set the viewer camera to defining this trajectory
        per_step_distance (float): How much distance (in m) should be approximately covered per trajectory step.
            This will determine the path length between individual waypoints
        fps (int): Frames per second when recording this video
        steps_per_frame (int): How many sim steps should occur between each frame being recorded. Minimum and
            default is 1.
        fpath (None or str): If specified, the absolute fpath to the video save location. Default is located in
            self.save_dir
    """
    # Create splines and their derivatives
    n_waypoints = len(waypoints)
    if n_waypoints < 3:
        og.log.error("Cannot generate trajectory from waypoints with less than 3 waypoints!")
        return

    splines = [CubicSpline(range(n_waypoints), waypoints[:, i], bc_type='clamped') for i in range(3)]
    dsplines = [spline.derivative() for spline in splines]

    # Function help get arc derivative
    def arc_derivative(u):
        return np.sqrt(np.sum([dspline(u) ** 2 for dspline in dsplines]))

    # Function to help get interpolated positions
    def get_interpolated_positions(step):
        assert step < n_waypoints - 1
        dist = quad(func=arc_derivative, a=step, b=step + 1)[0]
        path_length = int(dist / per_step_distance)
        interpolated_points = np.zeros((path_length, 3))
        for i in range(path_length):
            curr_step = step + (i / path_length)
            interpolated_points[i, :] = np.array([spline(curr_step) for spline in splines])
        return interpolated_points

    # Iterate over all waypoints and infer the resulting trajectory, recording the resulting poses
    poses = []
    for i in range(n_waypoints - 1):
        positions = get_interpolated_positions(step=i)
        for j in range(len(positions) - 1):
            # Get direction vector from the current to the following point
            direction = positions[j + 1] - positions[j]
            direction = direction / np.linalg.norm(direction)
            # Infer tilt and pan angles from this direction
            xy_direction = direction[:2] / np.linalg.norm(direction[:2])
            z = direction[2]
            pan_angle = np.arctan2(-xy_direction[0], xy_direction[1])
            tilt_angle = np.arcsin(z)
            # Infer global quat orientation from these angles
            quat = T.euler2quat([np.pi / 2 - tilt_angle, 0.0, pan_angle])
            poses.append([positions[j], quat])

    # Record the generated trajectory
    self.record_trajectory(poses=poses, fps=fps, steps_per_frame=steps_per_frame, fpath=fpath)

set_cam(cam)

Sets the active camera sensor for this CameraMover

Parameters:

Name	Type	Description	Default
cam	VisionSensor	The camera vision sensor to manipulate via the keyboard	required

Source code in omnigibson/utils/ui_utils.py

def set_cam(self, cam):
    """
    Sets the active camera sensor for this CameraMover

    Args:
        cam (VisionSensor): The camera vision sensor to manipulate via the keyboard
    """
    self.cam = cam

set_delta(delta)

Sets the delta value (how much the camera moves with each keypress) for this CameraMover

Parameters:

Name	Type	Description	Default
delta	float	Change (m) per keypress when moving the camera	required

Source code in omnigibson/utils/ui_utils.py

def set_delta(self, delta):
    """
    Sets the delta value (how much the camera moves with each keypress) for this CameraMover

    Args:
        delta (float): Change (m) per keypress when moving the camera
    """
    self.delta = delta

set_save_dir(save_dir)

Sets the absolute path corresponding to the image directory where recorded images from this CameraMover should be saved

Parameters:

Name	Type	Description	Default
save_dir	str	Absolute path to where recorded images should be stored	required

Source code in omnigibson/utils/ui_utils.py

def set_save_dir(self, save_dir):
    """
    Sets the absolute path corresponding to the image directory where recorded images from this CameraMover
    should be saved

    Args:
        save_dir (str): Absolute path to where recorded images should be stored
    """
    self.save_dir = save_dir

KeyboardEventHandler

Simple singleton class for handing keyboard events

Source code in omnigibson/utils/ui_utils.py

class KeyboardEventHandler:
    """
    Simple singleton class for handing keyboard events
    """
    # Global keyboard callbacks
    KEYBOARD_CALLBACKS = dict()

    # ID assigned to meta callback method for this class
    _CALLBACK_ID = None

    def __init__(self):
        raise ValueError("Cannot create an instance of keyboard event handler!")

    @classmethod
    def initialize(cls):
        """
        Hook up a meta function callback to the omni backend
        """
        appwindow = omni.appwindow.get_default_app_window()
        input_interface = carb.input.acquire_input_interface()
        keyboard = appwindow.get_keyboard()
        cls._CALLBACK_ID = input_interface.subscribe_to_keyboard_events(keyboard, cls._meta_callback)

    @classmethod
    def reset(cls):
        """
        Resets this callback interface by removing all current callback functions
        """
        appwindow = omni.appwindow.get_default_app_window()
        input_interface = carb.input.acquire_input_interface()
        keyboard = appwindow.get_keyboard()
        input_interface.unsubscribe_to_keyboard_events(keyboard, cls._CALLBACK_ID)
        cls.KEYBOARD_CALLBACKS = dict()
        cls._CALLBACK_ID = None

    @classmethod
    def add_keyboard_callback(cls, key, callback_fn):
        """
        Registers a keyboard callback function with omni, mapping a keypress from @key to run the callback_function
        @callback_fn

        Args:
            key (carb.input.KeyboardInput): key to associate with the callback
            callback_fn (function): Callback function to call if the key @key is pressed or repeated. Note that this
                function's signature should be:

                callback_fn() --> None
        """
        # Initialize the interface if not initialized yet
        if cls._CALLBACK_ID is None:
            cls.initialize()
        # Add the callback
        cls.KEYBOARD_CALLBACKS[key] = callback_fn

    @classmethod
    def _meta_callback(cls, event, *args, **kwargs):
        """
        Meta callback function that is hooked up to omni's backend
        """
        # Check if we've received a key press or repeat
        if event.type == carb.input.KeyboardEventType.KEY_PRESS \
                or event.type == carb.input.KeyboardEventType.KEY_REPEAT:
            # Run the specific callback
            cls.KEYBOARD_CALLBACKS.get(event.input, lambda: None)()

        # Always return True
        return True

add_keyboard_callback(key, callback_fn) classmethod

Registers a keyboard callback function with omni, mapping a keypress from @key to run the callback_function @callback_fn

Parameters:

Name	Type	Description	Default
key	carb.input.KeyboardInput	key to associate with the callback	required
callback_fn	function	Callback function to call if the key @key is pressed or repeated. Note that this function's signature should be: callback_fn() --> None	required

Source code in omnigibson/utils/ui_utils.py

@classmethod
def add_keyboard_callback(cls, key, callback_fn):
    """
    Registers a keyboard callback function with omni, mapping a keypress from @key to run the callback_function
    @callback_fn

    Args:
        key (carb.input.KeyboardInput): key to associate with the callback
        callback_fn (function): Callback function to call if the key @key is pressed or repeated. Note that this
            function's signature should be:

            callback_fn() --> None
    """
    # Initialize the interface if not initialized yet
    if cls._CALLBACK_ID is None:
        cls.initialize()
    # Add the callback
    cls.KEYBOARD_CALLBACKS[key] = callback_fn

initialize() classmethod

Hook up a meta function callback to the omni backend

Source code in omnigibson/utils/ui_utils.py

@classmethod
def initialize(cls):
    """
    Hook up a meta function callback to the omni backend
    """
    appwindow = omni.appwindow.get_default_app_window()
    input_interface = carb.input.acquire_input_interface()
    keyboard = appwindow.get_keyboard()
    cls._CALLBACK_ID = input_interface.subscribe_to_keyboard_events(keyboard, cls._meta_callback)

reset() classmethod

Resets this callback interface by removing all current callback functions

Source code in omnigibson/utils/ui_utils.py

@classmethod
def reset(cls):
    """
    Resets this callback interface by removing all current callback functions
    """
    appwindow = omni.appwindow.get_default_app_window()
    input_interface = carb.input.acquire_input_interface()
    keyboard = appwindow.get_keyboard()
    input_interface.unsubscribe_to_keyboard_events(keyboard, cls._CALLBACK_ID)
    cls.KEYBOARD_CALLBACKS = dict()
    cls._CALLBACK_ID = None

KeyboardRobotController

Simple class for controlling OmniGibson robots using keyboard commands

Source code in omnigibson/utils/ui_utils.py

class KeyboardRobotController:
    """
    Simple class for controlling OmniGibson robots using keyboard commands
    """

    def __init__(self, robot):
        """
        Args:
            robot (BaseRobot): robot to control
        """
        # Store relevant info from robot
        self.robot = robot
        self.action_dim = robot.action_dim
        self.controller_info = dict()
        idx = 0
        for name, controller in robot._controllers.items():
            self.controller_info[name] = {
                "name": type(controller).__name__,
                "start_idx": idx,
                "dofs": controller.dof_idx,
                "command_dim": controller.command_dim,
            }
            idx += controller.command_dim

        # Other persistent variables we need to keep track of
        self.joint_names = [name for name in robot.joints.keys()]  # Ordered list of joint names belonging to the robot
        self.joint_command_idx = None   # Indices of joints being directly controlled in the action array
        self.joint_control_idx = None  # Indices of joints being directly controlled in the actual joint array
        self.active_joint_command_idx_idx = 0   # Which index within the joint_command_idx variable is being controlled by the user
        self.current_joint = -1  # Active joint being controlled for joint control
        self.ik_arms = []               # List of arm controller names to be controlled by IK
        self.active_arm_idx = 0         # Which index within self.ik_arms is actively being controlled (only relevant for IK)
        self.binary_grippers = []           # Grippers being controlled using multi-finger binary controller
        self.active_gripper_idx = 0     # Which index within self.binary_grippers is actively being controlled
        self.gripper_direction = None  # Flips between -1 and 1, per arm controlled by multi-finger binary control
        self.persistent_gripper_action = None  # Persistent gripper commands, per arm controlled by multi-finger binary control
        # i.e.: if using binary gripper control and when no keypress is active, the gripper action should still the last executed gripper action
        self.keypress_mapping = None    # Maps omni keybindings to information for controlling various parts of the robot
        self.current_keypress = None    # Current key that is being pressed
        self.active_action = None       # Current action information based on the current keypress
        self.toggling_gripper = False   # Whether we should toggle the gripper during the next action

        # Populate the keypress mapping dictionary
        self.populate_keypress_mapping()

        # Register the keyboard callback function
        self.register_keyboard_handler()

    def register_keyboard_handler(self):
        """
        Sets up the keyboard callback functionality with omniverse
        """
        appwindow = omni.appwindow.get_default_app_window()
        input_interface = carb.input.acquire_input_interface()
        keyboard = appwindow.get_keyboard()
        sub_keyboard = input_interface.subscribe_to_keyboard_events(keyboard, self.keyboard_event_handler)

    def generate_ik_keypress_mapping(self, controller_info):
        """
        Generates a dictionary for keypress mappings for IK control, based on the inputted @controller_info

        Args:
            controller_info (dict): Dictionary of controller information for the specific robot arm to control
                with IK

        Returns:
            dict: Populated keypress mappings for IK to control the specified controller
        """
        mapping = {}

        mapping[carb.input.KeyboardInput.UP] = {"idx": controller_info["start_idx"] + 0, "val": 0.5}
        mapping[carb.input.KeyboardInput.DOWN] = {"idx": controller_info["start_idx"] + 0, "val": -0.5}
        mapping[carb.input.KeyboardInput.RIGHT] = {"idx": controller_info["start_idx"] + 1, "val": -0.5}
        mapping[carb.input.KeyboardInput.LEFT] = {"idx": controller_info["start_idx"] + 1, "val": 0.5}
        mapping[carb.input.KeyboardInput.P] = {"idx": controller_info["start_idx"] + 2, "val": 0.5}
        mapping[carb.input.KeyboardInput.SEMICOLON] = {"idx": controller_info["start_idx"] + 2, "val": -0.5}
        mapping[carb.input.KeyboardInput.N] = {"idx": controller_info["start_idx"] + 3, "val": 0.5}
        mapping[carb.input.KeyboardInput.B] = {"idx": controller_info["start_idx"] + 3, "val": -0.5}
        mapping[carb.input.KeyboardInput.O] = {"idx": controller_info["start_idx"] + 4, "val": 0.5}
        mapping[carb.input.KeyboardInput.U] = {"idx": controller_info["start_idx"] + 4, "val": -0.5}
        mapping[carb.input.KeyboardInput.V] = {"idx": controller_info["start_idx"] + 5, "val": 0.5}
        mapping[carb.input.KeyboardInput.C] = {"idx": controller_info["start_idx"] + 5, "val": -0.5}

        return mapping

    def populate_keypress_mapping(self):
        """
        Populates the mapping @self.keypress_mapping, which maps keypresses to action info:

            keypress:
                idx: <int>
                val: <float>
        """
        self.keypress_mapping = {}
        self.joint_command_idx = []
        self.joint_control_idx = []
        self.gripper_direction = {}
        self.persistent_gripper_action = {}

        # Add mapping for joint control directions (no index because these are inferred at runtime)
        self.keypress_mapping[carb.input.KeyboardInput.RIGHT_BRACKET] = {"idx": None, "val": 0.1}
        self.keypress_mapping[carb.input.KeyboardInput.LEFT_BRACKET] = {"idx": None, "val": -0.1}

        # Iterate over all controller info and populate mapping
        for component, info in self.controller_info.items():
            if info["name"] == "JointController":
                for i in range(info["command_dim"]):
                    cmd_idx = info["start_idx"] + i
                    self.joint_command_idx.append(cmd_idx)
                self.joint_control_idx += info["dofs"].tolist()
            elif info["name"] == "DifferentialDriveController":
                self.keypress_mapping[carb.input.KeyboardInput.I] = {"idx": info["start_idx"] + 0, "val": 0.4}
                self.keypress_mapping[carb.input.KeyboardInput.K] = {"idx": info["start_idx"] + 0, "val": -0.4}
                self.keypress_mapping[carb.input.KeyboardInput.L] = {"idx": info["start_idx"] + 1, "val": -0.2}
                self.keypress_mapping[carb.input.KeyboardInput.J] = {"idx": info["start_idx"] + 1, "val": 0.2}
            elif info["name"] == "InverseKinematicsController":
                self.ik_arms.append(component)
                self.keypress_mapping.update(self.generate_ik_keypress_mapping(controller_info=info))
            elif info["name"] == "MultiFingerGripperController":
                if info["command_dim"] > 1:
                    for i in range(info["command_dim"]):
                        cmd_idx = info["start_idx"] + i
                        self.joint_command_idx.append(cmd_idx)
                    self.joint_control_idx += info["dofs"].tolist()
                else:
                    self.keypress_mapping[carb.input.KeyboardInput.T] = {"idx": info["start_idx"], "val": 1.0}
                    self.gripper_direction[component] = 1.0
                    self.persistent_gripper_action[component] = 1.0
                    self.binary_grippers.append(component)
            elif info["name"] == "NullJointController":
                # We won't send actions if using a null gripper controller
                self.keypress_mapping[carb.input.KeyboardInput.T] = {"idx": None, "val": None}
            else:
                raise ValueError("Unknown controller name received: {}".format(info["name"]))

    def keyboard_event_handler(self, event, *args, **kwargs):
        # Check if we've received a key press or repeat
        if event.type == carb.input.KeyboardEventType.KEY_PRESS \
                or event.type == carb.input.KeyboardEventType.KEY_REPEAT:

            # Handle special cases
            if event.input in {carb.input.KeyboardInput.KEY_1, carb.input.KeyboardInput.KEY_2} and len(self.joint_control_idx) > 1:
                # Update joint and print out new joint being controlled
                self.active_joint_command_idx_idx = max(0, self.active_joint_command_idx_idx - 1) \
                    if event.input == carb.input.KeyboardInput.KEY_1 \
                    else min(len(self.joint_control_idx) - 1, self.active_joint_command_idx_idx + 1)
                print(f"Now controlling joint {self.joint_names[self.joint_control_idx[self.active_joint_command_idx_idx]]}")

            elif event.input in {carb.input.KeyboardInput.KEY_3, carb.input.KeyboardInput.KEY_4} and len(self.ik_arms) > 1:
                # Update arm, update keypress mapping, and print out new arm being controlled
                self.active_arm_idx = max(0, self.active_arm_idx - 1) \
                    if event.input == carb.input.KeyboardInput.KEY_3 \
                    else min(len(self.ik_arms) - 1, self.active_arm_idx + 1)
                new_arm = self.ik_arms[self.active_arm_idx]
                self.keypress_mapping.update(self.generate_ik_keypress_mapping(self.controller_info[new_arm]))
                print(f"Now controlling arm {new_arm} with IK")

            elif event.input in {carb.input.KeyboardInput.KEY_5, carb.input.KeyboardInput.KEY_6} and len(self.binary_grippers) > 1:
                # Update gripper, update keypress mapping, and print out new gripper being controlled
                self.active_gripper_idx = max(0, self.active_gripper_idx - 1) \
                    if event.input == carb.input.KeyboardInput.KEY_5 \
                    else min(len(self.binary_grippers) - 1, self.active_gripper_idx + 1)
                print(f"Now controlling gripper {self.binary_grippers[self.active_gripper_idx]} with binary toggling")

            elif event.input == carb.input.KeyboardInput.R:
                # Render the sensors from the robot's camera and lidar
                self.robot.visualize_sensors()

            elif event.input == carb.input.KeyboardInput.ESCAPE:
                # Terminate immediately
                og.shutdown()

            else:
                # Handle all other actions and update accordingly
                self.active_action = self.keypress_mapping.get(event.input, None)

            if event.type == carb.input.KeyboardEventType.KEY_PRESS:
                # Store the current keypress
                self.current_keypress = event.input

                # Also store whether we pressed the key for toggling gripper actions
                if event.input == carb.input.KeyboardInput.T:
                    self.toggling_gripper = True

        # If we release a key, clear the active action and keypress
        elif event.type == carb.input.KeyboardEventType.KEY_RELEASE:
            self.active_action = None
            self.current_keypress = None

        # Callback always needs to return True
        return True

    def get_random_action(self):
        """
        Returns:
            n-array: Generated random action vector (normalized)
        """
        return np.random.uniform(-1, 1, self.action_dim)

    def get_teleop_action(self):
        """
        Returns:
            n-array: Generated action vector based on received user inputs from the keyboard
        """
        action = np.zeros(self.action_dim)

        # Handle the action if any key is actively being pressed
        if self.active_action is not None:
            idx, val = self.active_action["idx"], self.active_action["val"]

            # Only handle the action if the value is specified
            if val is not None:
                # If there is no index, the user is controlling a joint with "[" and "]"
                if idx is None and len(self.joint_command_idx) != 0:
                    idx = self.joint_command_idx[self.active_joint_command_idx_idx]

                # Set the action
                if idx is not None:
                    action[idx] = val

        # Possibly set the persistent gripper action
        if len(self.binary_grippers) > 0 and self.keypress_mapping[carb.input.KeyboardInput.T]["val"] is not None:

            for i, binary_gripper in enumerate(self.binary_grippers):
                # Possibly update the stored value if the toggle gripper key has been pressed and
                # it's the active gripper being controlled
                if self.toggling_gripper and i == self.active_gripper_idx:
                    # We toggle the gripper direction or this gripper
                    self.gripper_direction[binary_gripper] *= -1.0
                    self.persistent_gripper_action[binary_gripper] = \
                        self.keypress_mapping[carb.input.KeyboardInput.T]["val"] * self.gripper_direction[binary_gripper]

                    # Clear the toggling gripper flag
                    self.toggling_gripper = False

                # Set the persistent action
                action[self.controller_info[binary_gripper]["start_idx"]] = self.persistent_gripper_action[binary_gripper]

        # Print out the user what is being pressed / controlled
        sys.stdout.write("\033[K")
        keypress_str = self.current_keypress.__str__().split(".")[-1]
        print("Pressed {}. Action: {}".format(keypress_str, action))
        sys.stdout.write("\033[F")

        # Return action
        return action

    @staticmethod
    def print_keyboard_teleop_info():
        """
        Prints out relevant information for teleop controlling a robot
        """

        def print_command(char, info):
            char += " " * (10 - len(char))
            print("{}\t{}".format(char, info))

        print()
        print("*" * 30)
        print("Controlling the Robot Using the Keyboard")
        print("*" * 30)
        print()
        print("Joint Control")
        print_command("1, 2", "decrement / increment the joint to control")
        print_command("[, ]", "move the joint backwards, forwards, respectively")
        print()
        print("Differential Drive Control")
        print_command("i, k", "turn left, right")
        print_command("l, j", "move forward, backwards")
        print()
        print("Inverse Kinematics Control")
        print_command("3, 4", "toggle between the different arm(s) to control")
        print_command(u"\u2190, \u2192", "translate arm eef along x-axis")
        print_command(u"\u2191, \u2193", "translate arm eef along y-axis")
        print_command("p, ;", "translate arm eef along z-axis")
        print_command("n, b", "rotate arm eef about x-axis")
        print_command("o, u", "rotate arm eef about y-axis")
        print_command("v, c", "rotate arm eef about z-axis")
        print()
        print("Boolean Gripper Control")
        print_command("5, 6", "toggle between the different gripper(s) using binary control")
        print_command("t", "toggle gripper (open/close)")
        print()
        print("Sensor Rendering")
        print_command("r", "render the onboard sensors (RGB, Depth, Normals, Instance Segmentation, Occupancy Map")
        print()
        print("*" * 30)
        print()

__init__(robot)

Parameters:

Name	Type	Description	Default
robot	BaseRobot	robot to control	required

Source code in omnigibson/utils/ui_utils.py

def __init__(self, robot):
    """
    Args:
        robot (BaseRobot): robot to control
    """
    # Store relevant info from robot
    self.robot = robot
    self.action_dim = robot.action_dim
    self.controller_info = dict()
    idx = 0
    for name, controller in robot._controllers.items():
        self.controller_info[name] = {
            "name": type(controller).__name__,
            "start_idx": idx,
            "dofs": controller.dof_idx,
            "command_dim": controller.command_dim,
        }
        idx += controller.command_dim

    # Other persistent variables we need to keep track of
    self.joint_names = [name for name in robot.joints.keys()]  # Ordered list of joint names belonging to the robot
    self.joint_command_idx = None   # Indices of joints being directly controlled in the action array
    self.joint_control_idx = None  # Indices of joints being directly controlled in the actual joint array
    self.active_joint_command_idx_idx = 0   # Which index within the joint_command_idx variable is being controlled by the user
    self.current_joint = -1  # Active joint being controlled for joint control
    self.ik_arms = []               # List of arm controller names to be controlled by IK
    self.active_arm_idx = 0         # Which index within self.ik_arms is actively being controlled (only relevant for IK)
    self.binary_grippers = []           # Grippers being controlled using multi-finger binary controller
    self.active_gripper_idx = 0     # Which index within self.binary_grippers is actively being controlled
    self.gripper_direction = None  # Flips between -1 and 1, per arm controlled by multi-finger binary control
    self.persistent_gripper_action = None  # Persistent gripper commands, per arm controlled by multi-finger binary control
    # i.e.: if using binary gripper control and when no keypress is active, the gripper action should still the last executed gripper action
    self.keypress_mapping = None    # Maps omni keybindings to information for controlling various parts of the robot
    self.current_keypress = None    # Current key that is being pressed
    self.active_action = None       # Current action information based on the current keypress
    self.toggling_gripper = False   # Whether we should toggle the gripper during the next action

    # Populate the keypress mapping dictionary
    self.populate_keypress_mapping()

    # Register the keyboard callback function
    self.register_keyboard_handler()

generate_ik_keypress_mapping(controller_info)

Generates a dictionary for keypress mappings for IK control, based on the inputted @controller_info

Parameters:

Name	Type	Description	Default
controller_info	dict	Dictionary of controller information for the specific robot arm to control with IK	required

Returns:

Name	Type	Description
dict		Populated keypress mappings for IK to control the specified controller

Source code in omnigibson/utils/ui_utils.py

def generate_ik_keypress_mapping(self, controller_info):
    """
    Generates a dictionary for keypress mappings for IK control, based on the inputted @controller_info

    Args:
        controller_info (dict): Dictionary of controller information for the specific robot arm to control
            with IK

    Returns:
        dict: Populated keypress mappings for IK to control the specified controller
    """
    mapping = {}

    mapping[carb.input.KeyboardInput.UP] = {"idx": controller_info["start_idx"] + 0, "val": 0.5}
    mapping[carb.input.KeyboardInput.DOWN] = {"idx": controller_info["start_idx"] + 0, "val": -0.5}
    mapping[carb.input.KeyboardInput.RIGHT] = {"idx": controller_info["start_idx"] + 1, "val": -0.5}
    mapping[carb.input.KeyboardInput.LEFT] = {"idx": controller_info["start_idx"] + 1, "val": 0.5}
    mapping[carb.input.KeyboardInput.P] = {"idx": controller_info["start_idx"] + 2, "val": 0.5}
    mapping[carb.input.KeyboardInput.SEMICOLON] = {"idx": controller_info["start_idx"] + 2, "val": -0.5}
    mapping[carb.input.KeyboardInput.N] = {"idx": controller_info["start_idx"] + 3, "val": 0.5}
    mapping[carb.input.KeyboardInput.B] = {"idx": controller_info["start_idx"] + 3, "val": -0.5}
    mapping[carb.input.KeyboardInput.O] = {"idx": controller_info["start_idx"] + 4, "val": 0.5}
    mapping[carb.input.KeyboardInput.U] = {"idx": controller_info["start_idx"] + 4, "val": -0.5}
    mapping[carb.input.KeyboardInput.V] = {"idx": controller_info["start_idx"] + 5, "val": 0.5}
    mapping[carb.input.KeyboardInput.C] = {"idx": controller_info["start_idx"] + 5, "val": -0.5}

    return mapping

get_random_action()

Returns:

Type	Description
	n-array: Generated random action vector (normalized)

Source code in omnigibson/utils/ui_utils.py

def get_random_action(self):
    """
    Returns:
        n-array: Generated random action vector (normalized)
    """
    return np.random.uniform(-1, 1, self.action_dim)

get_teleop_action()

Returns:

Type	Description
	n-array: Generated action vector based on received user inputs from the keyboard

Source code in omnigibson/utils/ui_utils.py

def get_teleop_action(self):
    """
    Returns:
        n-array: Generated action vector based on received user inputs from the keyboard
    """
    action = np.zeros(self.action_dim)

    # Handle the action if any key is actively being pressed
    if self.active_action is not None:
        idx, val = self.active_action["idx"], self.active_action["val"]

        # Only handle the action if the value is specified
        if val is not None:
            # If there is no index, the user is controlling a joint with "[" and "]"
            if idx is None and len(self.joint_command_idx) != 0:
                idx = self.joint_command_idx[self.active_joint_command_idx_idx]

            # Set the action
            if idx is not None:
                action[idx] = val

    # Possibly set the persistent gripper action
    if len(self.binary_grippers) > 0 and self.keypress_mapping[carb.input.KeyboardInput.T]["val"] is not None:

        for i, binary_gripper in enumerate(self.binary_grippers):
            # Possibly update the stored value if the toggle gripper key has been pressed and
            # it's the active gripper being controlled
            if self.toggling_gripper and i == self.active_gripper_idx:
                # We toggle the gripper direction or this gripper
                self.gripper_direction[binary_gripper] *= -1.0
                self.persistent_gripper_action[binary_gripper] = \
                    self.keypress_mapping[carb.input.KeyboardInput.T]["val"] * self.gripper_direction[binary_gripper]

                # Clear the toggling gripper flag
                self.toggling_gripper = False

            # Set the persistent action
            action[self.controller_info[binary_gripper]["start_idx"]] = self.persistent_gripper_action[binary_gripper]

    # Print out the user what is being pressed / controlled
    sys.stdout.write("\033[K")
    keypress_str = self.current_keypress.__str__().split(".")[-1]
    print("Pressed {}. Action: {}".format(keypress_str, action))
    sys.stdout.write("\033[F")

    # Return action
    return action

populate_keypress_mapping()

Populates the mapping @self.keypress_mapping, which maps keypresses to action info:

keypress:
    idx: <int>
    val: <float>

Source code in omnigibson/utils/ui_utils.py

def populate_keypress_mapping(self):
    """
    Populates the mapping @self.keypress_mapping, which maps keypresses to action info:

        keypress:
            idx: <int>
            val: <float>
    """
    self.keypress_mapping = {}
    self.joint_command_idx = []
    self.joint_control_idx = []
    self.gripper_direction = {}
    self.persistent_gripper_action = {}

    # Add mapping for joint control directions (no index because these are inferred at runtime)
    self.keypress_mapping[carb.input.KeyboardInput.RIGHT_BRACKET] = {"idx": None, "val": 0.1}
    self.keypress_mapping[carb.input.KeyboardInput.LEFT_BRACKET] = {"idx": None, "val": -0.1}

    # Iterate over all controller info and populate mapping
    for component, info in self.controller_info.items():
        if info["name"] == "JointController":
            for i in range(info["command_dim"]):
                cmd_idx = info["start_idx"] + i
                self.joint_command_idx.append(cmd_idx)
            self.joint_control_idx += info["dofs"].tolist()
        elif info["name"] == "DifferentialDriveController":
            self.keypress_mapping[carb.input.KeyboardInput.I] = {"idx": info["start_idx"] + 0, "val": 0.4}
            self.keypress_mapping[carb.input.KeyboardInput.K] = {"idx": info["start_idx"] + 0, "val": -0.4}
            self.keypress_mapping[carb.input.KeyboardInput.L] = {"idx": info["start_idx"] + 1, "val": -0.2}
            self.keypress_mapping[carb.input.KeyboardInput.J] = {"idx": info["start_idx"] + 1, "val": 0.2}
        elif info["name"] == "InverseKinematicsController":
            self.ik_arms.append(component)
            self.keypress_mapping.update(self.generate_ik_keypress_mapping(controller_info=info))
        elif info["name"] == "MultiFingerGripperController":
            if info["command_dim"] > 1:
                for i in range(info["command_dim"]):
                    cmd_idx = info["start_idx"] + i
                    self.joint_command_idx.append(cmd_idx)
                self.joint_control_idx += info["dofs"].tolist()
            else:
                self.keypress_mapping[carb.input.KeyboardInput.T] = {"idx": info["start_idx"], "val": 1.0}
                self.gripper_direction[component] = 1.0
                self.persistent_gripper_action[component] = 1.0
                self.binary_grippers.append(component)
        elif info["name"] == "NullJointController":
            # We won't send actions if using a null gripper controller
            self.keypress_mapping[carb.input.KeyboardInput.T] = {"idx": None, "val": None}
        else:
            raise ValueError("Unknown controller name received: {}".format(info["name"]))

print_keyboard_teleop_info() staticmethod

Prints out relevant information for teleop controlling a robot

Source code in omnigibson/utils/ui_utils.py

@staticmethod
def print_keyboard_teleop_info():
    """
    Prints out relevant information for teleop controlling a robot
    """

    def print_command(char, info):
        char += " " * (10 - len(char))
        print("{}\t{}".format(char, info))

    print()
    print("*" * 30)
    print("Controlling the Robot Using the Keyboard")
    print("*" * 30)
    print()
    print("Joint Control")
    print_command("1, 2", "decrement / increment the joint to control")
    print_command("[, ]", "move the joint backwards, forwards, respectively")
    print()
    print("Differential Drive Control")
    print_command("i, k", "turn left, right")
    print_command("l, j", "move forward, backwards")
    print()
    print("Inverse Kinematics Control")
    print_command("3, 4", "toggle between the different arm(s) to control")
    print_command(u"\u2190, \u2192", "translate arm eef along x-axis")
    print_command(u"\u2191, \u2193", "translate arm eef along y-axis")
    print_command("p, ;", "translate arm eef along z-axis")
    print_command("n, b", "rotate arm eef about x-axis")
    print_command("o, u", "rotate arm eef about y-axis")
    print_command("v, c", "rotate arm eef about z-axis")
    print()
    print("Boolean Gripper Control")
    print_command("5, 6", "toggle between the different gripper(s) using binary control")
    print_command("t", "toggle gripper (open/close)")
    print()
    print("Sensor Rendering")
    print_command("r", "render the onboard sensors (RGB, Depth, Normals, Instance Segmentation, Occupancy Map")
    print()
    print("*" * 30)
    print()

register_keyboard_handler()

Sets up the keyboard callback functionality with omniverse

Source code in omnigibson/utils/ui_utils.py

def register_keyboard_handler(self):
    """
    Sets up the keyboard callback functionality with omniverse
    """
    appwindow = omni.appwindow.get_default_app_window()
    input_interface = carb.input.acquire_input_interface()
    keyboard = appwindow.get_keyboard()
    sub_keyboard = input_interface.subscribe_to_keyboard_events(keyboard, self.keyboard_event_handler)

choose_from_options(options, name, random_selection=False)

Prints out options from a list, and returns the requested option.

Parameters:

Name	Type	Description	Default
options	dict or list	options to choose from. If dict, the value entries are assumed to be docstrings explaining the individual options	required
name	str	name of the options	required
random_selection	bool	if the selection is random (for automatic demo execution). Default False	False

Returns:

Name	Type	Description
str		Requested option

Source code in omnigibson/utils/ui_utils.py

def choose_from_options(options, name, random_selection=False):
    """
    Prints out options from a list, and returns the requested option.

    Args:
        options (dict or list): options to choose from. If dict, the value entries are assumed to be docstrings
            explaining the individual options
        name (str): name of the options
        random_selection (bool): if the selection is random (for automatic demo execution). Default False

    Returns:
        str: Requested option
    """
    # Select robot
    print("\nHere is a list of available {}s:\n".format(name))

    for k, option in enumerate(options):
        docstring = ": {}".format(options[option]) if isinstance(options, dict) else ""
        print("[{}] {}{}".format(k + 1, option, docstring))
    print()

    if not random_selection:
        try:
            s = input("Choose a {} (enter a number from 1 to {}): ".format(name, len(options)))
            # parse input into a number within range
            k = min(max(int(s), 1), len(options)) - 1
        except:
            k = 0
            print("Input is not valid. Use {} by default.".format(list(options)[k]))
    else:
        k = random.choice(range(len(options)))

    # Return requested option
    return list(options)[k]

create_module_logger(module_name)

Creates and returns a logger for logging statements from the module represented by @module_name

module_name (str): Module to create the logger for. Should be the module's __name__ variable

Returns:

Name	Type	Description
Logger		Created logger for the module

Source code in omnigibson/utils/ui_utils.py

def create_module_logger(module_name):
    """
    Creates and returns a logger for logging statements from the module represented by @module_name

    Args:
    module_name (str): Module to create the logger for. Should be the module's `__name__` variable

    Returns:
        Logger: Created logger for the module
    """
    return logging.getLogger(module_name)

disclaimer(msg)

Prints a disclaimer message, i.e.: "We know this doesn't work; it's an omni issue; we expect it to be fixed in the next release!

Source code in omnigibson/utils/ui_utils.py

def disclaimer(msg):
    """
    Prints a disclaimer message, i.e.: "We know this doesn't work; it's an omni issue; we expect it to be fixed in the
    next release!
    """
    if gm.SHOW_DISCLAIMERS:
        print("****** DISCLAIMER ******")
        print("Isaac Sim / Omniverse has some significant limitations and bugs in its current release.")
        print("This message has popped up because a potential feature in OmniGibson relies upon a feature in Omniverse that "
              "is yet to be released publically. Currently, the expected behavior may not be fully functional, but "
              "should be resolved by the next Isaac Sim release.")
        print(f"Exact Limitation: {msg}")
        print("************************")

dock_window(space, name, location, ratio=0.5)

Method for docking a specific GUI window in a specified location within the workspace

Parameters:

Name	Type	Description	Default
space	WindowHandle	Handle to the docking space to dock the window specified by @name	required
name	str	Name of a window to dock	required
location	omni.ui.DockPosition	docking position for placing the window specified by @name	required
ratio	float	Ratio when splitting the docking space between the pre-existing and newly added window	0.5

Returns:

Name	Type	Description
WindowHandle		Handle to the docking space that the window specified by @name was placed in

Source code in omnigibson/utils/ui_utils.py

def dock_window(space, name, location, ratio=0.5):
    """
    Method for docking a specific GUI window in a specified location within the workspace

    Args:
        space (WindowHandle): Handle to the docking space to dock the window specified by @name
        name (str): Name of a window to dock
        location (omni.ui.DockPosition): docking position for placing the window specified by @name
        ratio (float): Ratio when splitting the docking space between the pre-existing and newly added window

    Returns:
        WindowHandle: Handle to the docking space that the window specified by @name was placed in
    """
    window = omni.ui.Workspace.get_window(name)
    if window and space:
        window.dock_in(space, location, ratio=ratio)
    return window

suppress_loggers(logger_names)

A context scope for temporarily suppressing logging for certain omni channels.

Parameters:

Name	Type	Description	Default
logger_names	list of str	Logger name(s) whose corresponding loggers should be suppressed	required

Source code in omnigibson/utils/ui_utils.py

@contextlib.contextmanager
def suppress_loggers(logger_names):
    """
    A context scope for temporarily suppressing logging for certain omni channels.

    Args:
        logger_names (list of str): Logger name(s) whose corresponding loggers should be suppressed
    """
    if not gm.DEBUG:
        # Store prior states so we can restore them after this context exits
        logger_levels = {name: logging.getLogger(name).getEffectiveLevel() for name in logger_names}

        # Suppress the loggers (only output fatal messages)
        for name in logger_names:
            logging.getLogger(name).setLevel(logging.FATAL)

    yield

    if not gm.DEBUG:
        # Unsuppress the loggers
        for name in logger_names:
            logging.getLogger(name).setLevel(logger_levels[name])

suppress_omni_log(channels)

A context scope for temporarily suppressing logging for certain omni channels.

Parameters:

Name	Type	Description	Default
channels	None or list of str	Logging channel(s) to suppress. If None, will globally disable logger	required

Source code in omnigibson/utils/ui_utils.py

@contextlib.contextmanager
def suppress_omni_log(channels):
    """
    A context scope for temporarily suppressing logging for certain omni channels.

    Args:
        channels (None or list of str): Logging channel(s) to suppress. If None, will globally disable logger
    """
    # Record the state to restore to after the context exists
    log = omni.log.get_log()

    if gm.DEBUG:
        # Do nothing
        pass
    elif channels is None:
        # Globally disable log
        log.enabled = False
    else:
        # For some reason, all enabled states always return False even if the logging is clearly enabled for the
        # given channel, so we assume all channels are enabled
        # We do, however, check what behavior was assigned to this channel, since we force an override during this context
        channel_behavior = {channel: log.get_channel_enabled(channel)[2] for channel in channels}

        # Suppress the channels
        for channel in channels:
            log.set_channel_enabled(channel, False, omni.log.SettingBehavior.OVERRIDE)

    yield

    if gm.DEBUG:
        # Do nothing
        pass
    elif channels is None:
        # Globally re-enable log
        log.enabled = True
    else:
        # Unsuppress the channels
        for channel in channels:
            log.set_channel_enabled(channel, True, channel_behavior[channel])