I am in the process of learning how to rig. I have modelled a robot and I'm trying to rig the legs to move a certain way, but without any luck.
Please see the attached images.
Basically, I want point 'A' to work as a knee pivot, causing point 'B' and 'C' to close and come together when the leg bends (and vice versa when it moves outward). I want point 'D' to be a fixed position, with the leg moving forward, back, right and left from that point.
Whenever I have tried to rig the leg, point 'B' and 'C' have either stayed the same distance or just moved outward, and not inward.
Any suggestions would be greatly appreciated.