I'm doing my assignment which I have to create an animation of organ(intestine)'s digestion. I have to make organ (let's call it 'pipe' from now on) interact with excrement inside of itself.

enter image description here

The pipe should be squeezed(tightened?) a little bit before and after excrement passes the pipe, and as the excrement passes the pipe, that part should stretch(bulge?). bowel movement? peristalsis? don't know the exact term...

https://www.youtube.com/watch?v=Ujr0UAbyPS4 https://www.youtube.com/watch?v=6CoIDScAzog

links above are ideal animation I want as a result...

I'm a real beginner, and I learned basic modeling, sculpting and rigging tutorials. But I have no idea how to do this. Should I use IK rig? or soft body collision..? I don't ask for full solution. I just want to know the direction. I't would be great if there're some tutorials how to use those tools...

Help plz...



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