a node that takes a set of curves adjusting its y-value per cv with some basic cache so it runs faster when some curves is less dynamic (i.e. does not change constantly). it takes an input nurbs and a output nurbs for nurbs manipulation. the input nurbs defines the size and division of the output nurbs while the output nurbs has its own transform so it could be place elsewhere in the scene and the division can be adjusted using input nurbs (see towards the end of video). The contours are done through surface intersect at y-interval, these are quite slow hence they are not included in the node compute process. See above for video in real-time.