How to stop joint separation I have a problem with a model. I've rigged the model for animation, but what happens is that joints have a really weird separation, like this:



How do I solve this? The model came in four parts. I made them one, but the same happens to where the models meet, i.e. arms to torso, legs to torso. How do I fix it?
This is caused by unequal weights on the edges of the mesh sections. Essentially the bone is 'pulling' on the mesh a different amount on each edge. The two easiest options are to either join the loops (selecting both and pressing W and choosing remove doubles should do the trick) or carefully weight painting the edges to ensure both edges have the same weights.