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??本篇文章主要介绍基于ROS-TCP-Connector、ROS-TCP-Endpoint两个Unity接口与ROS进行通信的环境配置,并对官方给出的Unity和ROS相互通信示例中的消息部分做了说明
一、环境配置
参考:Unity-Robotics-Hub/setup.md at main · Unity-Technologies/Unity-Robotics-Hub (github.com)
??Ununtu环境下
??1.成功配置ros环境
??2.下载ROS-TCP-Endpoint放在工作空间编译
??ROS-TCP-Endpoint下载地址:Unity-Technologies/ROS-TCP-Endpoint: ROS package used to create an endpoint to accept ROS messages sent from a Unity scene using the ROS TCP Connector scripts (github.com)
??Unity环境下
??1.创建新项目,在Window/Package Manager下导入两个包(方式有两个,本地导入和URL导入)
??URL导入:
??两个包:- https://github.com/Unity-Technologies/ROS-TCP-Connector.git?path=/com.unity.robotics.ros-tcp-connector
- https://github.com/Unity-Technologies/ROS-TCP-Connector.git?path=/com.unity.robotics.visualizations
复制代码 ??导入成功结果如下:
??因为URL是在线下载,可能会连接失败(但我多试了几次也成功了)。选择本地的方式也可以,把整个包下载到本地,然后选择这两个com包:
??下载上面画的这两个,然后路径选择本地磁盘,点击之后,导入com文件夹下的package.json即可:
??这个时候发现Unity上多了一个选项:
??点击Robotics下面的ROS Settings进行配置,主要是两个ROS IP Address和ROS Port,关于ROS IP Address在ubuntu下用ifconfig查一下设置,然后端口任意了默认10000了
??到目前为止,两方的环境配置就结束了。
二、demo环境配置
??Ubuntu环境
??下载这两个到同一个工作空间,然后catkin_make一下
??下载路径:Unity-Robotics-Hub/tutorials/ros_unity_integration/ros_packages at main · Unity-Technologies/Unity-Robotics-Hub (github.com)
??Unity环境下
??点击“Robotics -> Generate ROS Messages…”
??那个ROS message path是把整个项目下载下来,然后选择tutorials/ros_unity_integration/ros_packages/unity_robotics_demo_msgs文件夹,最后再Build两个一下(为了换成C#文件)
三、实例:Unity发布,ros订阅
??1.ubuntu端先查一下IP(根据自己的IP地址实际替换)
??然后执行:- roslaunch ros_tcp_endpoint endpoint.launch tcp_ip:=192.168.178.134tcp_port:=10000
复制代码
??2.Unity端建立空物体挂载文件(命名:RosPublisherExample)把以下代码放进去,再新建一个Cube,把Cube做参数传入文件
- using UnityEngine;
- using Unity.Robotics.ROSTCPConnector;
- using RosMessageTypes.UnityRoboticsDemo;/// <summary>////// </summary>publicclassRosPublisherExample: MonoBehaviour
- {
- ROSConnection ros;public string topicName ="pos_rot";// The game objectpublic GameObject cube;// Publish the cube's position and rotation every N secondspublic float publishMessageFrequency =0.5f;// Used to determine how much time has elapsed since the last message was publishedprivate float timeElapsed;voidStart(){// start the ROS connection
- ros = ROSConnection.GetOrCreateInstance();
- ros.RegisterPublisher<PosRotMsg>(topicName);}privatevoidUpdate(){
- timeElapsed += Time.deltaTime;if(timeElapsed > publishMessageFrequency){
- cube.transform.rotation = Random.rotation;
- PosRotMsg cubePos =newPosRotMsg(
- cube.transform.position.x,
- cube.transform.position.y,
- cube.transform.position.z,
- cube.transform.rotation.x,
- cube.transform.rotation.y,
- cube.transform.rotation.z,
- cube.transform.rotation.w
- );// Finally send the message to server_endpoint.py running in ROS
- ros.Publish(topicName, cubePos);
- timeElapsed =0;}}}
复制代码 3.unity运行
??运行时出现下面的框,为蓝色时代表连接成功,红色是失败
??同时ubuntu那边也有显示:
??然后rostopic echo pos_rot,可以看到输出
四、实例:ros发布,Unity订阅
??1. ubuntu端先查一下IP(根据自己的IP地址实际替换)
??然后执行:- roslaunch ros_tcp_endpoint endpoint.launch tcp_ip:=192.168.178.134tcp_port:=10000
复制代码
??2.Unity端建立空物体挂载文件(命名:RosSubscriberExample)把以下代码放进去,再新建一个Cube,把Cube做参数传入文件
- using UnityEngine;
- using Unity.Robotics.ROSTCPConnector;
- using RosColor = RosMessageTypes.UnityRoboticsDemo.UnityColorMsg;publicclassRosSubscriberExample: MonoBehaviour
- {public GameObject cube;voidStart(){
- ROSConnection.GetOrCreateInstance().Subscribe<RosColor>("color", ColorChange);}voidColorChange(RosColor colorMessage){
- cube.GetComponent<Renderer>().material.color =newColor32((byte)colorMessage.r,(byte)colorMessage.g,(byte)colorMessage.b,(byte)colorMessage.a);}}
复制代码 ??3.unity运行
??运行时出现下面的框,为蓝色时代表连接成功,红色是失败
??4.ubuntu端再执行:
- rosrun unity_robotics_demo color_publisher.py
复制代码 ??运行一次Unity中物体改变一次颜色
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