Voyager88,
Sorry, I think I misread your original question... Although I think
the same principles could apply for your problem.  You could follow
the steps to getting a trimmed line, like I stated before... and then
you could use a Sweep 1 Rail component to create an extrusion with any
given section profile curve, and the rail curve would be the "trimmed"
lines you had just created.  This would be one way to do it.  I think
David Fano has some example definitions from his Acadia workshop
material that you can download.  Here's a link:
http://designreform.net/forum/index.php/topic,866.0.html  I believe
the example I am thinking of is in the Day 1.zip file.  It has an
inner surface and an outer surface with tubes spanning in between the
two surfaces... and the tubes are parametric so you can change the
spacing and distance of the offset.  I hope these help.

On Oct 31, 2:04 pm, Rchitekt <[EMAIL PROTECTED]> wrote:
> 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...
> 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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