Folding volumetric soft bodies
#1
Hi everybody!
Knowing how much of a help you`ve all been in the past with all my problems, thought I`ll come back here for some advice...

I am looking for a way to simulate soft body that can be folded, but is preserving it`s own volume in the same time. 
Want to avoid inflating it like a baloon, just keep the original shape that will wrinkle in the folds and interact with its own surface and surrounding objects.
Let`s say the object I want to bend should behave like a large pillow with a sponge inside that is rolled and bended.

Been fiddling with soft body tutorials, but the problem is, when soft body is moving faster- driven by some elements that are meant to move it around, the geometry is collapsing to the inside, that looks like it is an empty bag instead of  a soft body that have some volume to it. I would like to find a way to preserve a voume of soft body so it only gets wrinkled at the point where it is bending.

Would appreciate any ideas how you guys would approach such problem?
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#2
Maybe if you clone object that is used for cloth, add some Relax, or TyRelax (effectively make it smaller (and inside the cloth)) , and use it as collision object?
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