OrbbecSDK_ROS2/orbbec_camera/launch/multi_camera.launch.xml

<launch>
    <!-- unique camera name-->
    <arg name="camera_name" default="camera"/>
    <!-- Hardware depth registration -->
    <arg name="3d_sensor" default="gemini2"/>
    <!-- stereo_s_u3, astrapro, astra -->
    <arg name="camera1_prefix" default="01"/>
    <arg name="camera2_prefix" default="02"/>
    <arg name="camera1_usb_port" default="2-3.3"/>
    <arg name="camera2_usb_port" default="1-4.4"/>
    <arg name="device_num" default="2"/>
    <node name="camera" pkg="orbbec_camera" exec="ob_cleanup_shm_node" output="screen"/>
    <group>
        <include file="$(find-pkg-share orbbec_camera)/launch/$(var 3d_sensor).launch.xml">
            <arg name="camera_name" value="camera_$(var camera1_prefix)"/>
            <arg name="usb_port" value="$(var camera1_usb_port)"/>
            <arg name="device_num" value="$(var device_num)"/>
        </include>
    </group>
    <group>
        <include file="$(find-pkg-share orbbec_camera)/launch/$(var 3d_sensor).launch.xml">
            <arg name="camera_name" value="camera_$(var camera2_prefix)"/>
            <arg name="usb_port" value="$(var camera2_usb_port)"/>
            <arg name="device_num" value="$(var device_num)"/>
        </include>
    </group>
    <node pkg="tf2_ros" exec="static_transform_publisher" name="camera_tf"
          args="0 0 0 0 0 0 camera01_link camera02_link"/>
</launch>