[Bf-funboard] Floor constraint offset cannot be set to a negative value

[Hadrien Brissaud]

Hello all,

I am rigging a dress and using the floor constraint so the character's
knees deform it when coming in contact. I'd need to set a negative offset
so the dress moves a little ahead of the knee (to avoid interpenetrations)
but I found I can't. My workaround currently is to set the constraint's
target to another bone, located closer to the dress than the first one.

Cheers,

Hadrien