Animating rod rest position

[Hakazaba]

Ok i have this script in update, and i'm not seeing it have any effect on the physics. What am i doing wrong?

            var Bendtwist = rope.solverBatchOffsets[(int)Oni.ConstraintType.BendTwist];
        
            var solverConstraints = solver.GetConstraintsByType(Oni.ConstraintType.BendTwist)
            as ObiConstraints<ObiBendTwistConstraintsBatch>;

            int b = 0;
            int b2 = 0;
            bool batch = true;
            Quaternion prior = followChain[0].rotation;
            for (int i = 0; i<chain.Length;i++)
            {
                Quaternion next = prior;
                prior = followChain[i].rotation;
                if (batch){
                    solverConstraints.batches[0].restDarbouxVectors[Bendtwist[0]+b] = ObiUtils.RestDarboux(next,prior);
                    batch = false;
                    b++;
                }
                else {
                    
                    solverConstraints.batches[1].restDarbouxVectors[Bendtwist[1]+b2] = ObiUtils.RestDarboux(next,prior);
                    batch = true;
                    b2++;
                }
            }