Hi Hubert, I think you will need to increase the dim and order attributes of jit.gl.nurbs in relation to the ctlmatrix in order to get the effect you are looking for. The 12-planes are probably not necessary for you to get involved with at this point, but for a discussion of these, see the Geometry Under the Hood Tutorial. You may also want to check out Jitter Recipe 18: Manipulator for more help with reshaping nurbs: http://scoop.cycling74.com/story/2006/2/14/161736/108

Hope that helps.