I was trying to LED like or traffic light like simulation and i found few questions and video.

https://www.youtube.com/watch?v=Ze7JCK4wsiA https://www.youtube.com/watch?v=8YPFGZ-d-hc

https://answers.gazebosim.org//question/1377/visuals-material-update-from-modelplugin-in-ros-gazebo/

It seems like there is modelvisual example in osrf github https://github.com/osrf/gazebo/tree/gazebo11/examples/plugins/modelvisuals

but i coudln't fully understand how this works and it give me a trouble when i integrated with ROS. any one know how to use visual plugin or visual msg?

little advice or reference sites will help, thx!

• If there is another way to modify link color with ROS msg, let me know!