The way i did it was i made the pred a cloth (sounds odd i know) and then created a vertex



group to pin the vertices that weren't a part of the stomach (i could have made the boobs simulate too to get boob physics if i wanted to).





I then took the rig that i had copied and posed it in a way that looked like the kind of position



you'd be in in a stomach, then i scaled it down so it could fit inside the regular sized belly. Then i



animated it to scale up slowly over the course of 180 frames or something like that so the



physics simulation could catch up (otherwise the prey would just pass straight through the stomach).





Then it was a matter of tweaking the settings a bunch and cranking up the quality setting to insane amounts to get the simulation stable enough to get a smooth end result. And then i added a subsurf on top cause else it looked really bad.





(This was all in blender by the way)





If you have any other questions feel free to ask!

