Figure 2. Node-based slip system determination and folding process. Slip system values are determined for each node to be deformed. A vertical slice in the orientation of the unfolding plane through the node is calculated. The slip system through the node is defined parallel to the intersection line of the template surface and the unfolding plane. From this, the node values in the slip system, sth, are determined. The node is transferred to the new position by maintaining the sth values for the node transformation.