In this demonstration, participants will explore a system for multi-robot observation of a complex scene involving the activity of a person. Mobile robots have to cooperate to find a position around the scene maximizing its coverage, i.e. allowing a complete view of the human skeleton. Simultaneously, they have to map the unknown environment around the scene. We developed a simulator presented in this paper that allows to generate an environment, a scene, and to simulate robots' observations and motion. During the demonstration, users will be able to test our simulator, including setting up a scenario and a decision algorithm, monitoring the movements, observations and maps of the robots, and visualizing the performance of the team.