I am very new to bones, and something I haven't been able to figure out is how to constraint vertices to certain axis.
This is a simple model with some bones I added. Now, See what happens when I rotate the two middle bones:
I have circled where there is an undesirable deformation. What I would like to happen (but for these two bones only) is for the vertices to be constrained along Y. Basically, I want the vertices to slide along the edge, not rotate around the pivot. Everything else about this is fine to me; I just need the vertices along the edge that are connected to these bones to never move inward (or outward for that matter).
What are some ways to accomplish this?