I've been playing this game called "Tokyo Ghoul Project Killzone" and theres a function where you press key(e) and you'll get this extra body part attached and it is somehow animated and looks cool. Im wondering how he was able to animate that "body part"? Here's an example video: https://www.youtube.com/watch?v=rADxOmN0kjw go to 0:56-1:10, and you'll see that he takes out two centipede looking parts and its animated.