I am looking for a way to create a very long cylindrical object that maintains a specific length (and volume/radius) at all times.
But I want to be able to deform that object by bending it, and looping it, and so forth.
Basically a piece of string is what I'm trying to model. I want the string to be X units in length. But I want to be able to pick it up from the middle, or the end, or loop it or even tie it up. And have it remain the same length.
Is there any way to to do this in blender? To manipulate an objects shape, but keeping some of its basic physical size constant?