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i use this gz topic to get contact data /gazebo/default/physics/contacts and i try to get a center of presure but it turns out like something in this pic sss.jpg i also uploaded a vid for showing how contacts are shaky. https://drive.google.com/file/d/0B4bNDF3keBFieUVSd2hjS0Ztb1k/view?usp=sharing

i I use this gz topic to get contact data /gazebo/default/physics/contacts /gazebo/default/physics/contacts and i I'm try to get a center of presure pressure, but it turns out like something in this pic sss.jpg