Adds Arena G1 locomanipulation retargeters (#4140)

# Description
Added a retargeter for G1 upper body which takes in controller input and
outputs a bool for hand open/close in addition to the left and right EE
targets based on the controller position.

Fixes # (issue)

## Type of change

<!-- As you go through the list, delete the ones that are not
applicable. -->

- New feature (non-breaking change which adds functionality)

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there
Signed-off-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Kelly Guo <kellyg@nvidia.com>

source/isaaclab/config/extension.toml

 [package]
 
 # Note: Semantic Versioning is used: https://semver.org/
-version = "0.49.2"
+version = "0.49.3"
 
 # Description
 title = "Isaac Lab framework for Robot Learning"

source/isaaclab/docs/CHANGELOG.rst

 Changelog
 ---------
 
+0.49.3 (2025-12-03)
+~~~~~~~~~~~~~~~~~~~
+
+* Added :class:`G1TriHandUpperBodyMotionControllerGripperRetargeter` and :class:`G1TriHandUpperBodyMotionControllerGripperRetargeterCfg` for retargeting the gripper state from motion controllers.
+* Added unit tests for the retargeters.
+
+
 0.49.2 (2025-11-17)
 ~~~~~~~~~~~~~~~~~~~
 
@@ -10,6 +17,7 @@ Added
 * Added :attr:`~isaaclab.sensors.contact_sensor.ContactSensorCfg.track_friction_forces` to toggle tracking of friction forces between sensor bodies and filtered bodies.
 * Added :attr:`~isaaclab.sensors.contact_sensor.ContactSensorData.friction_forces_w` data field for tracking friction forces.
 
+
 0.49.1 (2025-11-26)
 ~~~~~~~~~~~~~~~~~~~
 

source/isaaclab/isaaclab/devices/openxr/retargeters/__init__.py

@@ -11,6 +11,10 @@ from .humanoid.unitree.g1_motion_controller_locomotion import (
     G1LowerBodyStandingMotionControllerRetargeterCfg,
 )
 from .humanoid.unitree.inspire.g1_upper_body_retargeter import UnitreeG1Retargeter, UnitreeG1RetargeterCfg
+from .humanoid.unitree.trihand.g1_upper_body_motion_ctrl_gripper import (
+    G1TriHandUpperBodyMotionControllerGripperRetargeter,
+    G1TriHandUpperBodyMotionControllerGripperRetargeterCfg,
+)
 from .humanoid.unitree.trihand.g1_upper_body_motion_ctrl_retargeter import (
     G1TriHandUpperBodyMotionControllerRetargeter,
     G1TriHandUpperBodyMotionControllerRetargeterCfg,

source/isaaclab/isaaclab/devices/openxr/retargeters/humanoid/unitree/trihand/g1_upper_body_motion_ctrl_gripper.py

+# Copyright (c) 2022-2025, The Isaac Lab Project Developers (https://github.com/isaac-sim/IsaacLab/blob/main/CONTRIBUTORS.md).
+# All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+from __future__ import annotations
+
+import numpy as np
+import torch
+from dataclasses import dataclass
+
+import isaaclab.utils.math as PoseUtils
+from isaaclab.devices.device_base import DeviceBase
+from isaaclab.devices.retargeter_base import RetargeterBase, RetargeterCfg
+
+
+class G1TriHandUpperBodyMotionControllerGripperRetargeter(RetargeterBase):
+    """Retargeter for G1 gripper that outputs a boolean state based on controller trigger input,
+    concatenated with the retargeted wrist pose.
+
+    Gripper:
+    - Uses hysteresis to prevent flickering when the trigger is near the threshold.
+    - Output is 0.0 for open, 1.0 for close.
+
+    Wrist:
+    - Retargets absolute pose from controller to robot frame.
+    - Applies a fixed offset rotation for comfort/alignment.
+    """
+
+    def __init__(self, cfg: G1TriHandUpperBodyMotionControllerGripperRetargeterCfg):
+        """Initialize the retargeter.
+
+        Args:
+            cfg: Configuration for the retargeter.
+        """
+        super().__init__(cfg)
+        self._cfg = cfg
+        # Track previous state for hysteresis (left, right)
+        self._prev_left_state: float = 0.0
+        self._prev_right_state: float = 0.0
+
+    def retarget(self, data: dict) -> torch.Tensor:
+        """Retarget controller inputs to gripper boolean state and wrist pose.
+
+        Args:
+            data: Dictionary with MotionControllerTrackingTarget.LEFT/RIGHT keys
+                 Each value is a 2D array: [pose(7), inputs(7)]
+
+        Returns:
+            Tensor: [left_gripper_state(1), right_gripper_state(1), left_wrist(7), right_wrist(7)]
+            Wrist format: [x, y, z, qw, qx, qy, qz]
+        """
+        # Get controller data
+        left_controller_data = data.get(DeviceBase.TrackingTarget.CONTROLLER_LEFT, np.array([]))
+        right_controller_data = data.get(DeviceBase.TrackingTarget.CONTROLLER_RIGHT, np.array([]))
+
+        # --- Gripper Logic ---
+        # Extract hand state from controller data with hysteresis
+        left_hand_state: float = self._extract_hand_state(left_controller_data, self._prev_left_state)
+        right_hand_state: float = self._extract_hand_state(right_controller_data, self._prev_right_state)
+
+        # Update previous states
+        self._prev_left_state = left_hand_state
+        self._prev_right_state = right_hand_state
+
+        gripper_tensor = torch.tensor([left_hand_state, right_hand_state], dtype=torch.float32, device=self._sim_device)
+
+        # --- Wrist Logic ---
+        # Default wrist poses (position + quaternion [w, x, y, z] as per default_wrist init)
+        # Note: default_wrist is [x, y, z, w, x, y, z] in reference, but seemingly used as [x,y,z, w,x,y,z]
+        default_wrist = np.array([0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0])
+
+        # Extract poses from controller data
+        left_wrist = self._extract_wrist_pose(left_controller_data, default_wrist)
+        right_wrist = self._extract_wrist_pose(right_controller_data, default_wrist)
+
+        # Convert to tensors
+        left_wrist_tensor = torch.tensor(self._retarget_abs(left_wrist), dtype=torch.float32, device=self._sim_device)
+        right_wrist_tensor = torch.tensor(self._retarget_abs(right_wrist), dtype=torch.float32, device=self._sim_device)
+
+        # Concatenate: [gripper(2), left_wrist(7), right_wrist(7)]
+        return torch.cat([gripper_tensor, left_wrist_tensor, right_wrist_tensor])
+
+    def _extract_hand_state(self, controller_data: np.ndarray, prev_state: float) -> float:
+        """Extract hand state from controller data with hysteresis.
+
+        Args:
+            controller_data: 2D array [pose(7), inputs(7)]
+            prev_state: Previous hand state (0.0 or 1.0)
+
+        Returns:
+            Hand state as float (0.0 for open, 1.0 for close)
+        """
+        if len(controller_data) <= DeviceBase.MotionControllerDataRowIndex.INPUTS.value:
+            return 0.0
+
+        # Extract inputs from second row
+        inputs = controller_data[DeviceBase.MotionControllerDataRowIndex.INPUTS.value]
+        if len(inputs) < len(DeviceBase.MotionControllerInputIndex):
+            return 0.0
+
+        # Extract specific inputs using enum
+        trigger = inputs[DeviceBase.MotionControllerInputIndex.TRIGGER.value]  # 0.0 to 1.0 (analog)
+
+        # Apply hysteresis
+        if prev_state < 0.5:  # Currently open
+            return 1.0 if trigger > self._cfg.threshold_high else 0.0
+        else:  # Currently closed
+            return 0.0 if trigger < self._cfg.threshold_low else 1.0
+
+    def _extract_wrist_pose(self, controller_data: np.ndarray, default_pose: np.ndarray) -> np.ndarray:
+        """Extract wrist pose from controller data.
+
+        Args:
+            controller_data: 2D array [pose(7), inputs(7)]
+            default_pose: Default pose to use if no data
+
+        Returns:
+            Wrist pose array [x, y, z, w, x, y, z]
+        """
+        if len(controller_data) > DeviceBase.MotionControllerDataRowIndex.POSE.value:
+            return controller_data[DeviceBase.MotionControllerDataRowIndex.POSE.value]
+        return default_pose
+
+    def _retarget_abs(self, wrist: np.ndarray) -> np.ndarray:
+        """Handle absolute pose retargeting for controller wrists."""
+        wrist_pos = torch.tensor(wrist[:3], dtype=torch.float32)
+        wrist_quat = torch.tensor(wrist[3:], dtype=torch.float32)
+
+        # Combined -75° (rather than -90° for wrist comfort) Y rotation + 90° Z rotation
+        # This is equivalent to (0, -75, 90) in euler angles
+        combined_quat = torch.tensor([0.5358, -0.4619, 0.5358, 0.4619], dtype=torch.float32)
+
+        openxr_pose = PoseUtils.make_pose(wrist_pos, PoseUtils.matrix_from_quat(wrist_quat))
+        transform_pose = PoseUtils.make_pose(torch.zeros(3), PoseUtils.matrix_from_quat(combined_quat))
+
+        result_pose = PoseUtils.pose_in_A_to_pose_in_B(transform_pose, openxr_pose)
+        pos, rot_mat = PoseUtils.unmake_pose(result_pose)
+        quat = PoseUtils.quat_from_matrix(rot_mat)
+
+        return np.concatenate([pos.numpy(), quat.numpy()])
+
+    def get_requirements(self) -> list[RetargeterBase.Requirement]:
+        return [RetargeterBase.Requirement.MOTION_CONTROLLER]
+
+
+@dataclass
+class G1TriHandUpperBodyMotionControllerGripperRetargeterCfg(RetargeterCfg):
+    """Configuration for the G1 boolean gripper and wrist retargeter."""
+
+    threshold_high: float = 0.6  # Threshold to close hand
+    threshold_low: float = 0.4  # Threshold to open hand
+    retargeter_type: type[RetargeterBase] = G1TriHandUpperBodyMotionControllerGripperRetargeter