feat(slam): add lidar SLAM and pointcloud processing packages

FAST_LIO/launch/gdb_debug_example.launch

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+<launch>
+
+  <arg name="rviz" default="true" />
+
+  <node pkg="fast_lio" type="fastlio_mapping" name="laserMapping" output="screen" required="true" launch-prefix="gdb -ex run --args">
+	<param name="imu_topic" type="string" value="/livox/imu" />
+	<param name="map_file_path" type="string" value=" " />
+	<param name="max_iteration" type="int" value="4" />
+	<param name="dense_map_enable" type="bool" value="1" />
+	<param name="fov_degree" type="double" value="75" />
+	<param name="filter_size_corner" type="double" value="0.2" />
+	<param name="filter_size_surf" type="double" value="0.2" />
+	<param name="filter_size_map" type="double" value="0.5" />
+	<param name="runtime_pos_log_enable" type="bool" value="1" />
+	<param name="cube_side_length" type="double" value="2000" />
+  </node>
+
+  <!-- <group if="$(arg rviz)">
+    <node launch-prefix="nice" pkg="rviz" type="rviz" name="rviz" args="-d $(find fast_lio)/rviz_cfg/loam_livox.rviz" />
+  </group> -->
+
+</launch>

FAST_LIO/launch/mapping.launch.py

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+import os.path
+
+from ament_index_python.packages import get_package_share_directory
+
+from launch import LaunchDescription
+from launch.actions import DeclareLaunchArgument
+from launch.substitutions import LaunchConfiguration, PathJoinSubstitution
+from launch.conditions import IfCondition
+
+from launch_ros.actions import Node
+
+
+def generate_launch_description():
+    package_path = get_package_share_directory('fast_lio')
+    default_config_path = os.path.join(package_path, 'config')
+    default_rviz_config_path = os.path.join(
+        package_path, 'rviz', 'fastlio.rviz')
+
+    use_sim_time = LaunchConfiguration('use_sim_time')
+    config_path = LaunchConfiguration('config_path')
+    config_file = LaunchConfiguration('config_file')
+    rviz_use = LaunchConfiguration('rviz')
+    rviz_cfg = LaunchConfiguration('rviz_cfg')
+
+    declare_use_sim_time_cmd = DeclareLaunchArgument(
+        'use_sim_time', default_value='false',
+        description='Use simulation (Gazebo) clock if true'
+    )
+    declare_config_path_cmd = DeclareLaunchArgument(
+        'config_path', default_value=default_config_path,
+        description='Yaml config file path'
+    )
+    decalre_config_file_cmd = DeclareLaunchArgument(
+        'config_file', default_value='mid360.yaml',
+        description='Config file'
+    )
+    declare_rviz_cmd = DeclareLaunchArgument(
+        'rviz', default_value='true',
+        description='Use RViz to monitor results'
+    )
+    declare_rviz_config_path_cmd = DeclareLaunchArgument(
+        'rviz_cfg', default_value=default_rviz_config_path,
+        description='RViz config file path'
+    )
+
+    fast_lio_node = Node(
+        package='fast_lio',
+        executable='fastlio_mapping',
+        parameters=[PathJoinSubstitution([config_path, config_file]),
+                    {'use_sim_time': use_sim_time}],
+        output='screen'
+    )
+    rviz_node = Node(
+        package='rviz2',
+        executable='rviz2',
+        arguments=['-d', rviz_cfg],
+        condition=IfCondition(rviz_use)
+    )
+
+    ld = LaunchDescription()
+    ld.add_action(declare_use_sim_time_cmd)
+    ld.add_action(declare_config_path_cmd)
+    ld.add_action(decalre_config_file_cmd)
+    ld.add_action(declare_rviz_cmd)
+    ld.add_action(declare_rviz_config_path_cmd)
+
+    ld.add_action(fast_lio_node)
+    ld.add_action(rviz_node)
+
+    return ld

FAST_LIO/launch/unilidar_l2.launch.py

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+import os.path
+
+from ament_index_python.packages import get_package_share_directory
+
+from launch import LaunchDescription
+from launch.actions import DeclareLaunchArgument
+from launch.substitutions import LaunchConfiguration, PathJoinSubstitution
+from launch.conditions import IfCondition
+
+from launch_ros.actions import Node
+
+
+def generate_launch_description():
+    package_path = get_package_share_directory('fast_lio')
+    default_config_path = os.path.join(package_path, 'config')
+    default_rviz_config_path = os.path.join(
+        package_path, 'rviz', 'fastlio.rviz')
+
+    use_sim_time = LaunchConfiguration('use_sim_time')
+    config_path = LaunchConfiguration('config_path')
+    config_file = LaunchConfiguration('config_file')
+    rviz_use = LaunchConfiguration('rviz')
+    rviz_cfg = LaunchConfiguration('rviz_cfg')
+
+    declare_use_sim_time_cmd = DeclareLaunchArgument(
+        'use_sim_time', default_value='false',
+        description='Use simulation (Gazebo) clock if true'
+    )
+    declare_config_path_cmd = DeclareLaunchArgument(
+        'config_path', default_value=default_config_path,
+        description='Yaml config file path'
+    )
+    decalre_config_file_cmd = DeclareLaunchArgument(
+        'config_file', default_value='unilidar_l2.yaml',
+        description='Config file'
+    )
+    declare_rviz_cmd = DeclareLaunchArgument(
+        'rviz', default_value='true',
+        description='Use RViz to monitor results'
+    )
+    declare_rviz_config_path_cmd = DeclareLaunchArgument(
+        'rviz_cfg', default_value=default_rviz_config_path,
+        description='RViz config file path'
+    )
+
+    fast_lio_node = Node(
+        package='fast_lio',
+        executable='fastlio_mapping',
+        parameters=[PathJoinSubstitution([config_path, config_file]),
+                    {'use_sim_time': use_sim_time}],
+        output='screen'
+    )
+    rviz_node = Node(
+        package='rviz2',
+        executable='rviz2',
+        arguments=['-d', rviz_cfg],
+        condition=IfCondition(rviz_use)
+    )
+
+    ld = LaunchDescription()
+    ld.add_action(declare_use_sim_time_cmd)
+    ld.add_action(declare_config_path_cmd)
+    ld.add_action(decalre_config_file_cmd)
+    ld.add_action(declare_rviz_cmd)
+    ld.add_action(declare_rviz_config_path_cmd)
+
+    ld.add_action(fast_lio_node)
+    ld.add_action(rviz_node)
+
+    return ld