I have weird behavior of ZSpheres when used for rigging. When I am posing - rotating the Leg from the hip (side view) the Skin of the Leg, especially the Foot is twisting around the ZSphere chain . Only the rIgged Skin is twsiting, the ZSphere Chain keeps the right orientation.
I found a topic about this issue, unfortunately there is no solution:
I can confirm, that this is happening, where there is a corner in the chain. Example: leg to foot 90 degrees . The arms for example are evolving more straight down the chain and do not have this behavior.
Some Images below…