Is there any way to fix a surface such that it can move only
one way along a particular direction? For example, how would I
fixture an entity such that it could only deflect along +X, but not
-X? A similar problem would be how could I allow compression while
restraining tension?
I couldn't find a way to accomplish this with fixture features, so
right now I'm trying to do this by modeling in a body that would
block displacement in one direction while allowing it in another.
Problem with that is the solver always gets hung up on defining the
contact sets or something like that.
