public void Initialise(Body body0, Vector3 body0Pos, Body body1, Vector3 body1Pos, float allowedDistance, float timescale)
        {
            this.body0Pos = body0Pos;
            this.body1Pos = body1Pos;
            this.body0 = body0;
            this.body1 = body1;

            this.allowedDistance = allowedDistance;
            this.timescale = timescale;

            if (timescale < JiggleMath.Epsilon)
                timescale = JiggleMath.Epsilon;

            if (body0 != null) body0.AddConstraint(this);
            if (body1 != null) body1.AddConstraint(this);
        }
        public void Initialise(Body body, Vector3 pointOnBody, Vector3 worldPosition)
        {
            this.body = body;
            this.pointOnBody = pointOnBody;
            this.worldPosition = worldPosition;

            if (body!=null) body.AddConstraint(this);
        }