How to update costmap according to dynamic obstacles?

[fatemehprhm]

Hi, thanks for your great package. I have a question about dynamic obstacles. I want to use your package to put the obstacles in the local costmap, however my obstacles are dynamic and move around in the environment and when i stop pulishing the previous polygon and publish the new one, the older one is still there. how can i update the costmap in a way that it clears all the previous published obstacles?