rig for hardsurface deformation I'm trying to build a simple rig in order to deform a rectangular prism (simple mesh for the time being), but it needs to have its deformation locked to just one an axis. The resulting mesh should be as if we had operated in a mesh level using a shear operator.

How should I build the rig to accomplish the resulting deformation using armatures? I've tried with all kind bone and object modifiers but none gives me a precise deformation.
I think this rig should do nicely!