Assigning different PoseKeyFrame to different Models of the world

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Dear all,

I'm new to Gazebo. I am trying to creat a simulation scenario with two "box"es.

I followed the tutorial for the ModelPlugin for an Animated box . The code is simple to modify, so I make the trajectory that I wanted. But I want to add another "box" to this Model Plugin where I address different PoseKeyFrames to different boxes. I want to know how I can assign the PoseKeyFrame function to different boxes (models)?

Thanks in advance,