Hello Peter,
you can use the division point and the tangent vector to  create a
plane with 0 and Z axis and make your lines upon the X or Y axis...
see the example below

http://groups.google.com/group/grasshopper3d/web/line%20perpendicular%20to%20curve.ghx

Best
Svetlin


On 21 mar, 17:36, "[email protected]"
<[email protected]> wrote:
> Hi,
>
> I would like to devide a given curve into a number of segments and
> then put a line at each of those division points which is perpidicular
> to the curve at that point.
>
> here is what I did :
> devide curve and put line with tangent vector from the division point.
> Then I rotated the line by 90degree around the point. does not quite
> work...
> any ideas what is wrong or different approach?!?
>
> thanks,
>
> Peter

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