@Override
    public void read(JmeImporter im) throws IOException {
        InputCapsule ic = im.getCapsule(this);
        affectedJoints = ic.readBitSet("affectedJoints", null);
    }
Remove the specified Joint and all its ancestors.

@param start the starting point (may be null, unaffected)
@return this
jme3-core/src/main/java/com/jme3/anim/ArmatureMask.java