说在前面

刚写这篇文章的时候在想 不会有人还在手撸urdf/xacro吧
但是在我整的过程中，发现这个gazebo真的太蠢了，遂放弃

gazebo图形界面版

注意：最后失败了，出现了奇怪的bug，开始仿真的时候整辆车只剩下底板

创建房间环境

gazebo界面->edit->building editor，里面可以画墙壁、门等，已经够用了

创建模型（如小车）

gazebo界面->edit->model editor
画几何体后右键->link inspector 修改参数，包含link、visual、collision三个菜单，里面都需要做相应的修改，尤其是pose、geometry这些参数，值得注意的是link菜单下的pose是这个link相对于世界坐标系的坐标，而inertial、visual、collision的pose则是相对于link自身坐标系的坐标。

我的建议是尽量画在中心对称的地方，包含多个元件的时候可以分开画多个model，然后在一个model里同时导入，然后对齐、加joint等操作。

另外

图形化操作会有各种bug，觉得不对劲就重启一下gazebo

手写xacro、urdf版

本人的经历说明，对于我来说环境的文件是可以可视化界面绘制的，模型还是手写xacro、urdf。

一般xacro是得用到的，因为可以用宏、include、数值计算等。对一个四轮机器人的物理模型表示，我是这样写的：

.xacro文件

 
<robot name="robot" 
  xmlns:xacro="http://www.ros.org/wiki/xacro">
 
  <xacro:include filename="robot.gazebo" />
  <xacro:property name="PI" value="3.1415926" />

  <link name="footprint">link>

 
  <link name='base'>
    <pose>0 0 0.1 0 0 0pose>
 
    <inertial>
      <mass value="1.50"/>
      <origin xyz="0.0 0 0" rpy=" 0 0 0"/>
      <inertia ixx="0.00282" ixy="0" ixz="0" iyy="0.00417" iyz="0" izz="0.00615" />
    inertial>
 
    <collision name='collision'>
      <origin xyz="0 0 0" rpy=" 0 0 0"/>
      <geometry>
        <box size="0.3 0.24 0.1"/>
      geometry>
    collision>
 
    <visual name='base_visual'>
      <origin xyz="0 0 0" rpy=" 0 0 0"/>
      <geometry>
        <box size="0.3 0.24 0.1"/>
      geometry>
    visual>
 
  link>

  <xacro:macro name="wheel_and_joint" params="name x y">

    <link name="${name}_wheel">
      <inertial>
        <mass value="0.50"/>
        <origin xyz="0.0 0 0" rpy=" 0 ${PI/2} ${PI/2}"/>
        <inertia ixx="0.0001" ixy="0" ixz="0" iyy="0.0001" iyz="0" izz="0.0001" />
      inertial>
  
      <visual>
        <origin xyz="0.0 0 0" rpy=" 0 ${PI/2} ${PI/2}"/>
        <geometry>
          <cylinder length="0.05" radius="0.06"/>
        geometry>
      visual>
  
      <collision>
        <origin xyz="0.0 0 0" rpy=" 0 ${PI/2} ${PI/2}"/>
        <geometry>
          <cylinder length="0.05" radius="0.06"/>
        geometry>
      collision>
    link>

    <joint type="continuous" name="${name}_wheel_joint">
      <origin xyz="${x} ${y} 0" rpy="0 0 0"/>
      <child link="${name}_wheel"/>
      <parent link="base"/>
      <axis xyz="0 1 0" rpy="0 0 0"/>
      <limit effort="10000" velocity="1000"/>
      <dynamics damping="1.0" friction="1.0"/>
    joint>

    <gazebo reference="${name}_wheel">
      <material>Gazebo/Graymaterial>
      <mu1>0.1mu1>
      <mu2>0.1mu2>
      <kp>500000.0kp>
      <kd>10.0kd>
      <minDepth>0.001minDepth>
      <maxVel>0.1maxVel>
      <fdir1>1 0 0fdir1>
    gazebo>

  xacro:macro>

  <xacro:macro name="ball_wheel_and_joint" params="name x y z">

    <link name="${name}_ball_wheel">
      <inertial>
        <mass value="0.1"/>
        <origin xyz="0.0 0 0" rpy=" 0 0 0"/>
        <inertia ixx="0.0005" ixy="0" ixz="0" iyy="0.0005" iyz="0" izz="0.0005" />
      inertial>
  
      <visual>
        <origin xyz="0.0 0 0" rpy=" 0 0 0"/>
        <geometry>
          <sphere radius="0.005"/>
        geometry>
      visual>
  
      <collision>
        <origin xyz="0.0 0 0" rpy=" 0 0 0"/>
        <geometry>
          <sphere radius="0.005"/>
        geometry>
      collision>
    link>

    <joint type="fixed" name="${name}_ball_wheel_joint">
      <origin xyz="${x} ${y} ${z}" rpy="0 0 0"/>
      <child link="${name}_ball_wheel"/>
      <parent link="base"/>
      <axis xyz="0 0 1" rpy="0 0 0"/>
    joint>

    <gazebo reference="${name}_ball_wheel">
      <material>Gazebo/Graymaterial>
      <mu1>0.1mu1>
      <mu2>0.1mu2>
      <kp>1000000.0kp>
      <kd>100.0kd>
      <minDepth>0.001minDepth>
      <maxVel>1.0maxVel>
    gazebo>
   
  xacro:macro>

  <xacro:wheel_and_joint name="front_left" x="0.05" y="0.15"/>
  
  <xacro:wheel_and_joint name="front_right" x="0.05" y="-0.15"/>
  
  <xacro:ball_wheel_and_joint name="back1" x="-0.11" y="0.1" z="-0.055"/>
  <xacro:ball_wheel_and_joint name="back2" x="-0.11" y="-0.1" z="-0.055"/>
  <link name="camera">
    <inertial>
      <mass value="0.1"/>
      <origin xyz="0.02 0.05 0.05" rpy=" 0 0 0"/>
      <inertia ixx="1e-6" ixy="0" ixz="0" iyy="1e-6" iyz="0" izz="1e-6" />
    inertial>
 
    <visual name="camera_visual">
      <origin xyz="0 0 0" rpy="0 0 0" />
      <geometry>
        <box size="0.02 0.05 0.05"/>
      geometry>
    visual>
 
    <collision name="camera_colision">
      <origin xyz="0 0 0" rpy="0 0 0" />
      <geometry>
        <box size="0.02 0.05 0.05"/>
      geometry>
    collision>
  link>
 
  <link name="vodyne">
    <inertial>
      <mass value="1e-5"/>
      <origin xyz="0 0 0" rpy=" 0 0 0"/>
      <inertia ixx="1e-6" ixy="0" ixz="0" iyy="1e-6" iyz="0" izz="1e-6" />
    inertial>
 
    <visual name="vodyne_visual">
      <origin xyz="0 0 0" rpy="0 0 0" />
      <geometry>
        <cylinder length="0.05" radius="0.06"/>
      geometry>
    visual>
 
    <collision name="vodyne_colision">
      <origin xyz="0 0 0" rpy="0 0 0" />
      <geometry>
          <cylinder length="0.05" radius="0.03"/>
      geometry>
    collision>
  link>
 
  
  <joint name="footprint_joint" type="fixed">
    <origin xyz="0 0 0" rpy="0 0 0" />
    <parent link="footprint"/>
    <child link="base" />
  joint>

  <joint type="fixed" name="camera_joint">
    <origin xyz="0.175 0 0" rpy="0 0 0"/>
    <child link="camera"/>
    <parent link="base"/>
    <axis xyz="0 0 1" rpy="0 0 0"/>
  joint>
 
  <joint type="fixed" name="vodyne_joint">
    <origin xyz="0.08 0 0.075" rpy="0 0 0"/>
    <child link="vodyne"/>
    <parent link="base"/>
    <axis xyz="0 0 1" rpy="0 0 0"/>
  joint>
 
  <gazebo reference="base">
    <material>Gazebo/Whitematerial>
  gazebo>
 
  <gazebo reference="camera">
    <material>Gazebo/Blackmaterial>
  gazebo>
 
  <gazebo reference="vodyne">
    <material>Gazebo/Blackmaterial>
  gazebo>

 
robot>


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.gazebo文件

其中robot.gazebo如下，包含了一些控制插件

<robot>
 
  
  <gazebo>
    <plugin name="differential_drive_controller" filename="libgazebo_ros_diff_drive.so">
      <alwaysOn>falsealwaysOn>
      <legacyMode>falselegacyMode>
      <publishTf>truepublishTf>
      <publishWheelJointState>truepublishWheelJointState>
      <updateRate>60updateRate>
      <leftJoint>front_left_wheel_jointleftJoint>
      <rightJoint>front_right_wheel_jointrightJoint>

      <wheelSeparation>0.30 wheelSeparation>
      <wheelDiameter>0.12wheelDiameter>
      <robotBaseFrame>footprintrobotBaseFrame>
      <torque>20torque>
      <commandTopic>cmd_velcommandTopic>
      <odometryTopic>odomodometryTopic>
      <odometryFrame>odomodometryFrame>
      <odometrySource>worldodometrySource>
      
      <wheelAcceleration>1wheelAcceleration>
      <wheelTorque>10wheelTorque>
      <rosDebugLevel>narosDebugLevel>

    plugin>
  gazebo>

  
  <gazebo reference="camera">
    <sensor type="camera" name="camera_sensor">
      <update_rate>30.0update_rate>
      <always_on>1always_on>
 
      <camera name="camera">
        <horizontal_fov>1.3962634horizontal_fov>
        <image>
          <width>800width>
          <height>800height>
          <format>R8G8B8format>
        image>
        <clip>
          <near>0.02near>
          <far>300far>
        clip>
        <distortion>
          <k1>0.0k1>
          <k2>0.0k2>
          <k3>0.0k3>
          <p1>0.0p1>
          <p2>0.0p2>
          <center>0.5 0.5center>
        distortion>
      camera>
      <plugin name="camera_controller" filename="libgazebo_ros_camera.so">
        <ros>
          <namespace>/robotnamespace>
          <argument>camera/image_raw:=/robot/camera/imageargument>
          <argument>camera/camera_info:=/robot/camera/image/camera_infoargument>
        ros>
        <camera_name>cameracamera_name>
        <frame_name>cameraframe_name>
        <hack_baseline>0.07hack_baseline>
      plugin>
    sensor>
  gazebo>
  <gazebo reference="vodyne">
    <sensor type="ray" name="vodyne16">
      <pose>0 0 0 0 0 0pose>
      <visualize>truevisualize>
      <update_rate>10update_rate>
      <ray>
        <scan>
          <horizontal>
            <samples>1200samples> 
            <resolution>1resolution>
            <min_angle>-1.0471975min_angle>
            <max_angle>1.0471975max_angle>
          horizontal>
          <vertical>
            <samples>64samples>
            <resolution>1resolution>
            <min_angle>-0.26179938min_angle>
            <max_angle>0.26179938max_angle>
          vertical>
        scan>
        <range>
          <min>0.055min>
          <max>100.0max>
          <resolution>0.1resolution>
        range>
        <noise>
          <type>gaussiantype>
          <mean>0.00mean>
          <stddev>0.01stddev>
        noise>
      ray>
      <plugin name="gazebo_ros_laser_controller" filename="libgazebo_ros_velodyne_laser.so">
        <topicName>/scantopicName>
        <frameName>laserframeName>
        <min_range>0.9min_range>
        <max_range>130.0max_range>
        <gaussianNoise>0.0gaussianNoise>
      plugin>
    sensor>
  gazebo>
  
robot>



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而gazebo调用机器人模型得通过urdf文件，使用我们还要进一步生成urdf文件（用xacro是为了方便），这个我就放最后面去，不放这边了，感兴趣的可以对照看

生成urdf文件

运行以下命令

rosrun xacro xacro xxx.xacro > xxx.urdf
1

也可以在之后的launch文件里，把 ， 两行替换成

launch文件

下面为初始化一个世界和一个机器人模型的模板launch文件，包含了世界生成、模型生成、坐标变换三个要素，以后只要对着这个改就行

<launch>

  <arg name="paused" default="false"/>
  <arg name="use_sim_time" default="true"/>
  <arg name="gui" default="true"/>
  <arg name="headless" default="false"/>
  <arg name="debug" default="false"/>
  <arg name="x" default="-3.0" />
  <arg name="y" default="-9.0" />
  <arg name="z" default="0.0" />
  <arg name="roll" default="0"/>
  <arg name="pitch" default="0"/>
  <arg name="yaw" default="1.5707963"/>

  
  <param name="robot_description" command="$(find xacro)/xacro --inorder '$(find robot)/urdf/robot.urdf.xacro'" /> 
  <arg name="robot_name" default="robot" />
  
  <include file="$(find gazebo_ros)/launch/empty_world.launch">
    <arg name="verbose" value="true"/>
    <arg name="world_name" value="$(find robot)/worlds/maze.world"/>
    <arg name="debug" value="$(arg debug)" />
    <arg name="gui" value="$(arg gui)" />
    <arg name="paused" value="$(arg paused)"/>
    <arg name="use_sim_time" value="$(arg use_sim_time)"/>
    <arg name="headless" value="$(arg headless)"/>
  include>
 

  

  <node name="urdf_spawner" pkg="gazebo_ros" type="spawn_model" respawn="false" output="screen"
  args="-urdf -x $(arg x) -y $(arg y) -z $(arg z) -R $(arg roll) -P $(arg pitch) -Y $(arg yaw) -model $(arg robot_name) -param robot_description"/>

  <node name="tf_scan_pub" pkg="tf2_ros" type="static_transform_publisher" args="0.08 0 0.075 0 0 0 /footprint /laser"/> 

launch>

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附录：maze.world

<sdf version='1.7'>
  <world name='default'>
    <light name='sun' type='directional'>
      <cast_shadows>1cast_shadows>
      <pose>0 0 10 0 -0 0pose>
      <diffuse>0.8 0.8 0.8 1diffuse>
      <specular>0.2 0.2 0.2 1specular>
      <attenuation>
        <range>1000range>
        <constant>0.9constant>
        <linear>0.01linear>
        <quadratic>0.001quadratic>
      attenuation>
      <direction>-0.5 0.1 -0.9direction>
      <spot>
        <inner_angle>0inner_angle>
        <outer_angle>0outer_angle>
        <falloff>0falloff>
      spot>
    light>
    <model name='ground_plane'>
      <static>1static>
      <link name='link'>
        <collision name='collision'>
          <geometry>
            <plane>
              <normal>0 0 1normal>
              <size>100 100size>
            plane>
          geometry>
          <surface>
            <friction>
              <ode>
                <mu>100mu>
                <mu2>50mu2>
              ode>
              <torsional>
                <ode/>
              torsional>
            friction>
            <contact>
              <ode/>
            contact>
            <bounce/>
          surface>
          <max_contacts>10max_contacts>
        collision>
        <visual name='visual'>
          <cast_shadows>0cast_shadows>
          <geometry>
            <plane>
              <normal>0 0 1normal>
              <size>100 100size>
            plane>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Grey</name>
            script>
          material>
        visual>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
    model>
    <gravity>0 0 -9.8gravity>
    <magnetic_field>6e-06 2.3e-05 -4.2e-05magnetic_field>
    <atmosphere type='adiabatic'/>
    <physics type='ode'>
      <max_step_size>0.001max_step_size>
      <real_time_factor>1real_time_factor>
      <real_time_update_rate>1000real_time_update_rate>
    physics>
    <scene>
      <ambient>0.4 0.4 0.4 1ambient>
      <background>0.7 0.7 0.7 1background>
      <shadows>1shadows>
    scene>
    <wind/>
    <spherical_coordinates>
      <surface_model>EARTH_WGS84surface_model>
      <latitude_deg>0latitude_deg>
      <longitude_deg>0longitude_deg>
      <elevation>0elevation>
      <heading_deg>0heading_deg>
    spherical_coordinates>
    <state world_name='default'>
      <sim_time>2549 610000000sim_time>
      <real_time>2562 864281356real_time>
      <wall_time>1659430410 402862747wall_time>
      <iterations>2549610iterations>
      <model name='ground_plane'>
        <pose>0 0 0 0 -0 0pose>
        <scale>1 1 1scale>
        <link name='link'>
          <pose>0 0 0 0 -0 0pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
      model>
      <model name='maze_big'>
        <pose>-4.5354 -0.426624 0 0 -0 0pose>
        <scale>1 1 1scale>
        <link name='Wall_47'>
          <pose>-23.4402 1.32338 0 0 -0 1.5708pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_48'>
          <pose>-4.51517 7.24838 0 0 -0 0pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_49'>
          <pose>14.4098 -0.426624 0 0 0 -1.5708pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_50'>
          <pose>6.7348 -8.10162 0 0 -0 3.14159pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_51'>
          <pose>-0.94017 -5.42662 0 0 -0 1.5708pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_53'>
          <pose>-21.3056 -0.232422 0 0 -0 0pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_54'>
          <pose>-19.1306 -1.78242 0 0 0 -1.5708pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_55'>
          <pose>-17.0806 -3.33242 0 0 -0 0pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_56'>
          <pose>-15.0306 0.092578 0 0 -0 1.5708pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_57'>
          <pose>-17.5806 3.51758 0 0 -0 3.14159pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_62'>
          <pose>-14.2247 -8.0808 0 0 -0 0pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_63'>
          <pose>-5.04972 -4.0308 0 0 -0 1.5708pose>
          <velocity>0 0 0 0 -0 0velocity>
          <acceleration>0 0 0 0 -0 0acceleration>
          <wrench>0 0 0 0 -0 0wrench>
        link>
        <link name='Wall_64'>
          <pose>2.87528 0.019196 0 0 -0 0pose>
          <velocity>0 0 0 0 -0 0velocity>
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              <torsional>
                <ode/>
              torsional>
              <ode/>
            friction>
          surface>
        collision>
        <visual name='Wall_73_Visual'>
          <pose>0 0 1.25 0 -0 0pose>
          <geometry>
            <box>
              <size>12.75 0.15 2.5size>
            box>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Wood</name>
            script>
            <ambient>1 1 1 1ambient>
          material>
          <meta>
            <layer>0layer>
          meta>
        visual>
        <pose>9.80762 4.07739 0 0 -0 0pose>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
      <link name='Wall_76'>
        <collision name='Wall_76_Collision'>
          <geometry>
            <box>
              <size>7.25 0.15 2.5size>
            box>
          geometry>
          <pose>0 0 1.25 0 -0 0pose>
          <max_contacts>10max_contacts>
          <surface>
            <contact>
              <ode/>
            contact>
            <bounce/>
            <friction>
              <torsional>
                <ode/>
              torsional>
              <ode/>
            friction>
          surface>
        collision>
        <visual name='Wall_76_Visual'>
          <pose>0 0 1.25 0 -0 0pose>
          <geometry>
            <box>
              <size>7.25 0.15 2.5size>
            box>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Wood</name>
            script>
            <ambient>1 1 1 1ambient>
          material>
          <meta>
            <layer>0layer>
          meta>
        visual>
        <pose>-0.042383 4.07739 0 0 -0 3.14159pose>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
      <link name='Wall_78'>
        <collision name='Wall_78_Collision'>
          <geometry>
            <box>
              <size>2.75 0.15 2.5size>
            box>
          geometry>
          <pose>0 0 1.25 0 -0 0pose>
          <max_contacts>10max_contacts>
          <surface>
            <contact>
              <ode/>
            contact>
            <bounce/>
            <friction>
              <torsional>
                <ode/>
              torsional>
              <ode/>
            friction>
          surface>
        collision>
        <visual name='Wall_78_Visual'>
          <pose>0 0 1.25 0 -0 0pose>
          <geometry>
            <box>
              <size>2.75 0.15 2.5size>
            box>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Wood</name>
            script>
            <ambient>1 1 1 1ambient>
          material>
          <meta>
            <layer>0layer>
          meta>
        visual>
        <pose>-5.58947 -2.80015 0 0 -0 0pose>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
      <link name='Wall_79'>
        <collision name='Wall_79_Collision'>
          <geometry>
            <box>
              <size>2.25 0.15 2.5size>
            box>
          geometry>
          <pose>0 0 1.25 0 -0 0pose>
          <max_contacts>10max_contacts>
          <surface>
            <contact>
              <ode/>
            contact>
            <bounce/>
            <friction>
              <torsional>
                <ode/>
              torsional>
              <ode/>
            friction>
          surface>
        collision>
        <visual name='Wall_79_Visual'>
          <pose>0 0 1.25 0 -0 0pose>
          <geometry>
            <box>
              <size>2.25 0.15 2.5size>
            box>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Wood</name>
            script>
            <ambient>1 1 1 1ambient>
          material>
          <meta>
            <layer>0layer>
          meta>
        visual>
        <pose>-4.28947 -3.85015 0 0 -0 -1.5708pose>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
      <link name='Wall_81'>
        <collision name='Wall_81_Collision'>
          <geometry>
            <box>
              <size>3.75 0.15 2.5size>
            box>
          geometry>
          <pose>0 0 1.25 0 -0 0pose>
          <max_contacts>10max_contacts>
          <surface>
            <contact>
              <ode/>
            contact>
            <bounce/>
            <friction>
              <torsional>
                <ode/>
              torsional>
              <ode/>
            friction>
          surface>
        collision>
        <visual name='Wall_81_Visual'>
          <pose>0 0 1.25 0 -0 0pose>
          <geometry>
            <box>
              <size>3.75 0.15 2.5size>
            box>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Wood</name>
            script>
            <ambient>1 1 1 1ambient>
          material>
          <meta>
            <layer>0layer>
          meta>
        visual>
        <pose>-2.31432 0.44582 0 0 -0 3.14159pose>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
      <link name='Wall_85'>
        <collision name='Wall_85_Collision'>
          <geometry>
            <box>
              <size>10.5 0.15 2.5size>
            box>
          geometry>
          <pose>0 0 1.25 0 -0 0pose>
          <max_contacts>10max_contacts>
          <surface>
            <contact>
              <ode/>
            contact>
            <bounce/>
            <friction>
              <torsional>
                <ode/>
              torsional>
              <ode/>
            friction>
          surface>
        collision>
        <visual name='Wall_85_Visual'>
          <pose>0 0 1.25 0 -0 0pose>
          <geometry>
            <box>
              <size>10.5 0.15 2.5size>
            box>
          geometry>
          <material>
            <script>
              <uri>file://media/materials/scripts/gazebo.material</uri>
              <name>Gazebo/Wood</name>
            script>
            <ambient>1 1 1 1ambient>
          material>
          <meta>
            <layer>0layer>
          meta>
        visual>
        <pose>-6.88947 2.37485 0 0 -0 1.5708pose>
        <self_collide>0self_collide>
        <enable_wind>0enable_wind>
        <kinematic>0kinematic>
      link>
      <static>1static>
    model>
    <gui fullscreen='0'>
      <camera name='user_camera'>
        <pose>-61.3252 -25.5797 25.1052 0 0.265797 0.513018pose>
        <view_controller>orbitview_controller>
        <projection_type>perspectiveprojection_type>
      camera>
    gui>
  world>
sdf>

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附录：robot.urdf

<robot name="robot">
  
  <gazebo>
    <plugin filename="libgazebo_ros_diff_drive.so" name="differential_drive_controller">
      <alwaysOn>falsealwaysOn>
      <legacyMode>falselegacyMode>
      <publishTf>truepublishTf>
      <publishWheelJointState>truepublishWheelJointState>
      <updateRate>60updateRate>
      <leftJoint>front_left_wheel_jointleftJoint>
      <rightJoint>front_right_wheel_jointrightJoint>
      <wheelSeparation>0.30 wheelSeparation>
      <wheelDiameter>0.12wheelDiameter>
      <robotBaseFrame>footprintrobotBaseFrame>
      <torque>20torque>
      <commandTopic>cmd_velcommandTopic>
      <odometryTopic>odomodometryTopic>
      <odometryFrame>odomodometryFrame>
      <odometrySource>worldodometrySource>
      <wheelAcceleration>1wheelAcceleration>
      <wheelTorque>10wheelTorque>
      <rosDebugLevel>narosDebugLevel>
    plugin>
  gazebo>
  
  <gazebo reference="camera">
    <sensor name="camera_sensor" type="camera">
      <update_rate>30.0update_rate>
      <always_on>1always_on>
      <camera name="camera">
        <horizontal_fov>1.3962634horizontal_fov>
        <image>
          <width>800width>
          <height>800height>
          <format>R8G8B8format>
        image>
        <clip>
          <near>0.02near>
          <far>300far>
        clip>
        <distortion>
          <k1>0.0k1>
          <k2>0.0k2>
          <k3>0.0k3>
          <p1>0.0p1>
          <p2>0.0p2>
          <center>0.5 0.5center>
        distortion>
      camera>
      <plugin filename="libgazebo_ros_camera.so" name="camera_controller">
        <ros>
          <namespace>/robotnamespace>
          <argument>camera/image_raw:=/robot/camera/imageargument>
          <argument>camera/camera_info:=/robot/camera/image/camera_infoargument>
        ros>
        <camera_name>cameracamera_name>
        <frame_name>cameraframe_name>
        <hack_baseline>0.07hack_baseline>
      plugin>
    sensor>
  gazebo>
  <gazebo reference="vodyne">
    <sensor name="vodyne16" type="ray">
      <pose>0 0 0 0 0 0pose>
      <visualize>truevisualize>
      <update_rate>10update_rate>
      <ray>
        <scan>
          <horizontal>
            <samples>1200samples>
            
            <resolution>1resolution>
            <min_angle>-1.0471975min_angle>
            <max_angle>1.0471975max_angle>
          horizontal>
          <vertical>
            <samples>64samples>
            <resolution>1resolution>
            <min_angle>-0.26179938min_angle>
            <max_angle>0.26179938max_angle>
          vertical>
        scan>
        <range>
          <min>0.055min>
          <max>100.0max>
          <resolution>0.1resolution>
        range>
        <noise>
          <type>gaussiantype>
          <mean>0.00mean>
          <stddev>0.01stddev>
        noise>
      ray>
      <plugin filename="libgazebo_ros_velodyne_laser.so" name="gazebo_ros_laser_controller">
        <topicName>/scantopicName>
        <frameName>laserframeName>
        <min_range>0.9min_range>
        <max_range>130.0max_range>
        <gaussianNoise>0.0gaussianNoise>
      plugin>
    sensor>
  gazebo>
  <link name="footprint"/>
  <link name="base">
    <pose>0 0 0.1 0 0 0pose>
    <inertial>
      <mass value="1.50"/>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <inertia ixx="0.00282" ixy="0" ixz="0" iyy="0.00417" iyz="0" izz="0.00615"/>
    inertial>
    <collision name="collision">
      <origin rpy=" 0 0 0" xyz="0 0 0"/>
      <geometry>
        <box size="0.3 0.24 0.1"/>
      geometry>
    collision>
    <visual name="base_visual">
      <origin rpy=" 0 0 0" xyz="0 0 0"/>
      <geometry>
        <box size="0.3 0.24 0.1"/>
      geometry>
    visual>
  link>
  <link name="front_left_wheel">
    <inertial>
      <mass value="0.50"/>
      <origin rpy=" 0 1.5707963 1.5707963" xyz="0.0 0 0"/>
      <inertia ixx="0.0001" ixy="0" ixz="0" iyy="0.0001" iyz="0" izz="0.0001"/>
    inertial>
    <visual>
      <origin rpy=" 0 1.5707963 1.5707963" xyz="0.0 0 0"/>
      <geometry>
        <cylinder length="0.05" radius="0.06"/>
      geometry>
    visual>
    <collision>
      <origin rpy=" 0 1.5707963 1.5707963" xyz="0.0 0 0"/>
      <geometry>
        <cylinder length="0.05" radius="0.06"/>
      geometry>
    collision>
  link>
  <joint name="front_left_wheel_joint" type="continuous">
    <origin rpy="0 0 0" xyz="0.05 0.15 0"/>
    <child link="front_left_wheel"/>
    <parent link="base"/>
    <axis rpy="0 0 0" xyz="0 1 0"/>
    <limit effort="10000" velocity="1000"/>
    <dynamics damping="1.0" friction="1.0"/>
  joint>
  <gazebo reference="front_left_wheel">
    <material>Gazebo/Graymaterial>
    <mu1>0.1mu1>
    <mu2>0.1mu2>
    <kp>500000.0kp>
    <kd>10.0kd>
    <minDepth>0.001minDepth>
    <maxVel>0.1maxVel>
    <fdir1>1 0 0fdir1>
  gazebo>
  <link name="front_right_wheel">
    <inertial>
      <mass value="0.50"/>
      <origin rpy=" 0 1.5707963 1.5707963" xyz="0.0 0 0"/>
      <inertia ixx="0.0001" ixy="0" ixz="0" iyy="0.0001" iyz="0" izz="0.0001"/>
    inertial>
    <visual>
      <origin rpy=" 0 1.5707963 1.5707963" xyz="0.0 0 0"/>
      <geometry>
        <cylinder length="0.05" radius="0.06"/>
      geometry>
    visual>
    <collision>
      <origin rpy=" 0 1.5707963 1.5707963" xyz="0.0 0 0"/>
      <geometry>
        <cylinder length="0.05" radius="0.06"/>
      geometry>
    collision>
  link>
  <joint name="front_right_wheel_joint" type="continuous">
    <origin rpy="0 0 0" xyz="0.05 -0.15 0"/>
    <child link="front_right_wheel"/>
    <parent link="base"/>
    <axis rpy="0 0 0" xyz="0 1 0"/>
    <limit effort="10000" velocity="1000"/>
    <dynamics damping="1.0" friction="1.0"/>
  joint>
  <gazebo reference="front_right_wheel">
    <material>Gazebo/Graymaterial>
    <mu1>0.1mu1>
    <mu2>0.1mu2>
    <kp>500000.0kp>
    <kd>10.0kd>
    <minDepth>0.001minDepth>
    <maxVel>0.1maxVel>
    <fdir1>1 0 0fdir1>
  gazebo>
  <link name="back1_ball_wheel">
    <inertial>
      <mass value="0.1"/>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <inertia ixx="0.0005" ixy="0" ixz="0" iyy="0.0005" iyz="0" izz="0.0005"/>
    inertial>
    <visual>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <geometry>
        <sphere radius="0.005"/>
      geometry>
    visual>
    <collision>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <geometry>
        <sphere radius="0.005"/>
      geometry>
    collision>
  link>
  <joint name="back1_ball_wheel_joint" type="fixed">
    <origin rpy="0 0 0" xyz="-0.11 0.1 -0.055"/>
    <child link="back1_ball_wheel"/>
    <parent link="base"/>
    <axis rpy="0 0 0" xyz="0 0 1"/>
  joint>
  <gazebo reference="back1_ball_wheel">
    <material>Gazebo/Graymaterial>
    <mu1>0.1mu1>
    <mu2>0.1mu2>
    <kp>1000000.0kp>
    <kd>100.0kd>
    <minDepth>0.001minDepth>
    <maxVel>1.0maxVel>
  gazebo>
  <link name="back2_ball_wheel">
    <inertial>
      <mass value="0.1"/>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <inertia ixx="0.0005" ixy="0" ixz="0" iyy="0.0005" iyz="0" izz="0.0005"/>
    inertial>
    <visual>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <geometry>
        <sphere radius="0.005"/>
      geometry>
    visual>
    <collision>
      <origin rpy=" 0 0 0" xyz="0.0 0 0"/>
      <geometry>
        <sphere radius="0.005"/>
      geometry>
    collision>
  link>
  <joint name="back2_ball_wheel_joint" type="fixed">
    <origin rpy="0 0 0" xyz="-0.11 -0.1 -0.055"/>
    <child link="back2_ball_wheel"/>
    <parent link="base"/>
    <axis rpy="0 0 0" xyz="0 0 1"/>
  joint>
  <gazebo reference="back2_ball_wheel">
    <material>Gazebo/Graymaterial>
    <mu1>0.1mu1>
    <mu2>0.1mu2>
    <kp>1000000.0kp>
    <kd>100.0kd>
    <minDepth>0.001minDepth>
    <maxVel>1.0maxVel>
  gazebo>
  <link name="camera">
    <inertial>
      <mass value="0.1"/>
      <origin rpy=" 0 0 0" xyz="0.02 0.05 0.05"/>
      <inertia ixx="1e-6" ixy="0" ixz="0" iyy="1e-6" iyz="0" izz="1e-6"/>
    inertial>
    <visual name="camera_visual">
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <geometry>
        <box size="0.02 0.05 0.05"/>
      geometry>
    visual>
    <collision name="camera_colision">
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <geometry>
        <box size="0.02 0.05 0.05"/>
      geometry>
    collision>
  link>
  <link name="vodyne">
    <inertial>
      <mass value="1e-5"/>
      <origin rpy=" 0 0 0" xyz="0 0 0"/>
      <inertia ixx="1e-6" ixy="0" ixz="0" iyy="1e-6" iyz="0" izz="1e-6"/>
    inertial>
    <visual name="vodyne_visual">
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <geometry>
        <cylinder length="0.05" radius="0.06"/>
      geometry>
    visual>
    <collision name="vodyne_colision">
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <geometry>
        <cylinder length="0.05" radius="0.03"/>
      geometry>
    collision>
  link>
  <joint name="footprint_joint" type="fixed">
    <origin rpy="0 0 0" xyz="0 0 0"/>
    <parent link="footprint"/>
    <child link="base"/>
  joint>
  <joint name="camera_joint" type="fixed">
    <origin rpy="0 0 0" xyz="0.175 0 0"/>
    <child link="camera"/>
    <parent link="base"/>
    <axis rpy="0 0 0" xyz="0 0 1"/>
  joint>
  <joint name="vodyne_joint" type="fixed">
    <origin rpy="0 0 0" xyz="0.08 0 0.075"/>
    <child link="vodyne"/>
    <parent link="base"/>
    <axis rpy="0 0 0" xyz="0 0 1"/>
  joint>
  <gazebo reference="base">
    <material>Gazebo/Whitematerial>
  gazebo>
  <gazebo reference="camera">
    <material>Gazebo/Blackmaterial>
  gazebo>
  <gazebo reference="vodyne">
    <material>Gazebo/Blackmaterial>
  gazebo>
robot>

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附录：ros2的控制器参考

<gazebo>
    <plugin filename="libgazebo_ros_diff_drive.so" name="skid_steer_drive_controller">
      <ros>
        <namespace>/mobotnamespace>
        <argument>/cmd_vel:=mr_cme_velargument>
        <argument>/odom:=odomargument>
      ros>
      <update_rate>100.0update_rate>
      <num_wheel_pairs>2num_wheel_pairs>
      <odometry_frame>odomodometry_frame>
      <left_joint>front_left_wheel_jointleft_joint>
      <left_joint>back_left_wheel_jointleft_joint>
      <wheel_separation>0.4wheel_separation>
      <wheel_diameter>0.2wheel_diameter>
      <right_joint>front_right_wheel_jointright_joint>
      <right_joint>back_right_wheel_jointright_joint>
      <wheel_separation>0.4wheel_separation>
      <wheel_diameter>0.2wheel_diameter>
      <robot_base_frame>robot_footprintrobot_base_frame>
      <max_wheel_torque>20max_wheel_torque>
      <publish_odom>truepublish_odom>
      <publish_odom_tf>truepublish_odom_tf>
      <publish_wheel_tf>truepublish_wheel_tf>
      <odometry_source>worldodometry_source>
    plugin>
  gazebo>
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附录：多线雷达的添加

这里需要把原代码中的 hokuyo_link换为vodyne，安装相关插件sudo apt-get install ros-noetic-velodyne-simulator并且在.gazebo中把雷达插件部分脚本更改如下，其他不变

<gazebo reference="vodyne">
    <sensor type="ray" name="vodyne16">
      <pose>0 0 0 0 0 0pose>
      <visualize>truevisualize>
      <update_rate>10update_rate>
      <ray>
        <scan>
          <horizontal>
            <samples>1200samples> 
            <resolution>1resolution>
            <min_angle>-1.0471975min_angle>
            <max_angle>1.0471975max_angle>
          horizontal>
          <vertical>
            <samples>64samples>
            <resolution>1resolution>
            <min_angle>-0.26179938min_angle>
            <max_angle>0.26179938max_angle>
          vertical>
        scan>
        <range>
          <min>0.055min>
          <max>100.0max>
          <resolution>0.1resolution>
        range>
        <noise>
          <type>gaussiantype>
          <mean>0.00mean>
          <stddev>0.01stddev>
        noise>
      ray>
      <plugin name="gazebo_ros_laser_controller" filename="libgazebo_ros_velodyne_laser.so">
        <topicName>/scantopicName>
        <frameName>laserframeName>
        <min_range>0.9min_range>
        <max_range>130.0max_range>
        <gaussianNoise>0.0gaussianNoise>
      plugin>
    sensor>
  gazebo>
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