[Gmsh] creating ruled surfaces bounded by Bsplines and how to obtain intersections

charles quarra charlesjquarra at gmail.com
Mon Dec 2 16:50:29 CET 2013

btw, I'm using gmsh-2.8.2

On Mon, Dec 2, 2013 at 10:49 AM, charles quarra <charlesjquarra at gmail.com>wrote:

> Hi,
> I'm just learning gmsh from the tutorial, and I have some questions
> regarding gmsh geometry design,
> I have two Bsplines with common start and end points that are not coplanar
> to each other. A ruled surface cannot be created with a loop from these two
> Bsplines because the loop needs to have at least 3 lines.
> My initial idea was to define a third line by creating a third Bspline,
> whose start point and end point where the middle points of the two original
> Bsplines, thus producing 3 loops of 3 lines each, and I would be able to
> create a ruled surface from those loops
> But how could I create such third Bspline? I don't understand how the
> "split" line functionality in gmsh works. (It doesn't seem to be mentioned
> in the tutorial either), basically it seems to ask for a "split point" but
> when I click somewhere on the line nothing happens. If I add a point that
> intersects the line somewhere the selection of that point seems to work,
> but then I click 'e' to finish selection and nothing happens; when I hover
> on each side of the line both are labeled as the original line, so no split
> seems to actually happen
> I tried to find how to intersect the original Bsplines with a plane, but I
> couldn't find that functionality anywhere
> Any ideas?
> thanks
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