Hmmm, what I was trying to do was connect a specific point to another on a surface with a straight line, in order to divide that surface into a controlable number of lines (straight, not curved), which connect predictably. See attached *.png that shows what I was trying to achieve. (4 line directions in total)
http://grasshopper3d.googlegroups.com/web/2008-10-07+Generated+Mesh+Elements.PNG I have created a super long winded way of doing this, but it seems very inefficient, by manually selecting a row of points, and connecting these to the adjacent (shifted) row, and so on through all possible rows (limited by how dense I have allowed the mesh to be). It slows down the programme considerably when sliding sliders... I'm trying to rework it slowly... Unfortunately I am not permitted to post the *.wrm, but well, you get my drift, if anyone else has tried to generate such a line grid off a surface, any hints or tips are welcome, many thanks! Pax
