hi guys, i have a surface,and i've got some curves on it the same direction with the curve (hard to describe, like this pic,the curves in red: http://picasaweb.google.com/lh/photo/nsBpH-JHY322nEtxodRXBw?authkey=Gv1sRgCK3AvMLl9ZPfGw&feat=directlink)
what i need is to extrude these curves in the direction that is vertical to the surface at every point on it, just like the 3rd pic in this page: http://freeformfever.blogspot.com/2009/03/ruled-surfaces-with-grasshopper-2.html what should i do? (i'm not native speaker,forgive me for my expression i hope you can understand)
