Minecraft Rigging: Making Perfect Sharp Bends

I noticed that all the tutorials on sharp bends for Minecraft characters did not preserve the "square-ness" of the legs and arms. In this video I show you how to make a perfect sharp bend in Blender 3D using drivers and shape keys. There is an updated version of this in my newer tutorial where I model, texture, and rig a Minecraft Cave Spider for the MCPrep addon. https://youtu.be/GRswbzQjtaA