Voyager88,
I had a very similar problem when I was create a installation where we
were intending to suspend 3000 jars from the ceiling with fishing
line.  I had to come up a with a definition that would "trim" the line
using a given surface.  To do this, I created a grid of points above
the surface.  I then copied the points below the surface and used the
Line component to connect the points.  This would create a vertical
line passing through the surface I wanted to trim.  I used the Surface/
Curve intersect component to then solve where each line was
intersecting the surface... ultimately creating a set of points on the
surface.  I then connected these new points on the surface to the
original points that were above the surface to create the "trimmed"
lines.  I've created a tutorial that goes step-by-step through the
process, which might help you in your application.  The tutorial and
source files are located here:
http://www.liftarchitects.com/journal/2008/10/12/grasshopper-tutorial-suspended-ceiling.html
I hope this helps.

On Oct 31, 1:38 pm, visose <[EMAIL PROTECTED]> wrote:
> If it's only one curve, you can try using the project curve to surface
> component and create a loft between the original curve and the
> projected one.
>
> On Oct 31, 7:24 pm, voyager88 <[EMAIL PROTECTED]> wrote:
>
> > Is there any way to extrude a line to terminate at a surface?  or to
> > use a bounding surface to trim an extrusion?
> > thanks.

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