Source code for omni.isaac.lab.devices.spacemouse.se3_spacemouse
# Copyright (c) 2022-2024, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
"""Spacemouse controller for SE(3) control."""
import hid
import numpy as np
import threading
import time
from collections.abc import Callable
from scipy.spatial.transform import Rotation
from ..device_base import DeviceBase
from .utils import convert_buffer
[docs]class Se3SpaceMouse(DeviceBase):
"""A space-mouse controller for sending SE(3) commands as delta poses.
This class implements a space-mouse controller to provide commands to a robotic arm with a gripper.
It uses the `HID-API`_ which interfaces with USD and Bluetooth HID-class devices across multiple platforms [1].
The command comprises of two parts:
* delta pose: a 6D vector of (x, y, z, roll, pitch, yaw) in meters and radians.
* gripper: a binary command to open or close the gripper.
Note:
The interface finds and uses the first supported device connected to the computer.
Currently tested for following devices:
- SpaceMouse Compact: https://3dconnexion.com/de/product/spacemouse-compact/
.. _HID-API: https://github.com/libusb/hidapi
"""
[docs] def __init__(self, pos_sensitivity: float = 0.4, rot_sensitivity: float = 0.8):
"""Initialize the space-mouse layer.
Args:
pos_sensitivity: Magnitude of input position command scaling. Defaults to 0.4.
rot_sensitivity: Magnitude of scale input rotation commands scaling. Defaults to 0.8.
"""
# store inputs
self.pos_sensitivity = pos_sensitivity
self.rot_sensitivity = rot_sensitivity
# acquire device interface
self._device = hid.device()
self._find_device()
# read rotations
self._read_rotation = False
# command buffers
self._close_gripper = False
self._delta_pos = np.zeros(3) # (x, y, z)
self._delta_rot = np.zeros(3) # (roll, pitch, yaw)
# dictionary for additional callbacks
self._additional_callbacks = dict()
# run a thread for listening to device updates
self._thread = threading.Thread(target=self._run_device)
self._thread.daemon = True
self._thread.start()
def __del__(self):
"""Destructor for the class."""
self._thread.join()
def __str__(self) -> str:
"""Returns: A string containing the information of joystick."""
msg = f"Spacemouse Controller for SE(3): {self.__class__.__name__}\n"
msg += f"\tManufacturer: {self._device.get_manufacturer_string()}\n"
msg += f"\tProduct: {self._device.get_product_string()}\n"
msg += "\t----------------------------------------------\n"
msg += "\tRight button: reset command\n"
msg += "\tLeft button: toggle gripper command (open/close)\n"
msg += "\tMove mouse laterally: move arm horizontally in x-y plane\n"
msg += "\tMove mouse vertically: move arm vertically\n"
msg += "\tTwist mouse about an axis: rotate arm about a corresponding axis"
return msg
"""
Operations
"""
[docs] def reset(self):
# default flags
self._close_gripper = False
self._delta_pos = np.zeros(3) # (x, y, z)
self._delta_rot = np.zeros(3) # (roll, pitch, yaw)
[docs] def add_callback(self, key: str, func: Callable):
# check keys supported by callback
if key not in ["L", "R"]:
raise ValueError(f"Only left (L) and right (R) buttons supported. Provided: {key}.")
# TODO: Improve this to allow multiple buttons on same key.
self._additional_callbacks[key] = func
[docs] def advance(self) -> tuple[np.ndarray, bool]:
"""Provides the result from spacemouse event state.
Returns:
A tuple containing the delta pose command and gripper commands.
"""
rot_vec = Rotation.from_euler("XYZ", self._delta_rot).as_rotvec()
# if new command received, reset event flag to False until keyboard updated.
return np.concatenate([self._delta_pos, rot_vec]), self._close_gripper
"""
Internal helpers.
"""
def _find_device(self):
"""Find the device connected to computer."""
found = False
# implement a timeout for device search
for _ in range(5):
for device in hid.enumerate():
if device["product_string"] == "SpaceMouse Compact":
# set found flag
found = True
vendor_id = device["vendor_id"]
product_id = device["product_id"]
# connect to the device
self._device.open(vendor_id, product_id)
# check if device found
if not found:
time.sleep(1.0)
else:
break
# no device found: return false
if not found:
raise OSError("No device found by SpaceMouse. Is the device connected?")
def _run_device(self):
"""Listener thread that keeps pulling new messages."""
# keep running
while True:
# read the device data
data = self._device.read(7)
if data is not None:
# readings from 6-DoF sensor
if data[0] == 1:
self._delta_pos[1] = self.pos_sensitivity * convert_buffer(data[1], data[2])
self._delta_pos[0] = self.pos_sensitivity * convert_buffer(data[3], data[4])
self._delta_pos[2] = self.pos_sensitivity * convert_buffer(data[5], data[6]) * -1.0
elif data[0] == 2 and not self._read_rotation:
self._delta_rot[1] = self.rot_sensitivity * convert_buffer(data[1], data[2])
self._delta_rot[0] = self.rot_sensitivity * convert_buffer(data[3], data[4])
self._delta_rot[2] = self.rot_sensitivity * convert_buffer(data[5], data[6])
# readings from the side buttons
elif data[0] == 3:
# press left button
if data[1] == 1:
# close gripper
self._close_gripper = not self._close_gripper
# additional callbacks
if "L" in self._additional_callbacks:
self._additional_callbacks["L"]
# right button is for reset
if data[1] == 2:
# reset layer
self.reset()
# additional callbacks
if "R" in self._additional_callbacks:
self._additional_callbacks["R"]
if data[1] == 3:
self._read_rotation = not self._read_rotation
