Pt to Pt geodesic line

Dear All,
Is there anybody who could give me an example how to call a rhino command such as _ShortPath (Geodesic Line) and input the surface, point A and point B. I understand that this has to be done using a scripting box but I am not yet fit with that topic.
A definition with the script box as example would be really helpful for me.

Thanks

Replies to This Discussion

Permalink Reply by SamuElf on September 17, 2009 at 9:02am

Well, this is a trial. I took the script from an example given with RhinoScript 101. I try to adapt it for Grasshopper but now I am confuse.

Is anybody could debug that out?

Many Thanks

Attachments:

TryMakeGeodesic.ghx, 27 KB
Page58_GeodesicCurve.rvb, 4 KB

Permalink Reply by David Rutten on September 17, 2009 at 11:16am

Hi Samu,

that script does not use the Rhino geodesic function. The next version of Grasshopper will have a geodesic component, do you need it now? or can it wait a week or two?

--
David Rutten
david@mcneel.com
Seattle, WA

Permalink Reply by SamuElf on September 17, 2009 at 2:14pm

David,
sweet from you to answer... Of course I can wait a week or 2!

Nevertheless, if there is any command existing in Rhino that I would like to call, how can I do that? This is something unclear for me using Grasshopper.

Cheers
Samu-el F

Permalink Reply by Moritz Fleischmann on September 30, 2009 at 8:23am

Hi David,

I just returned from eCAADe and had a brief chat with Giulio Piacentino (as well as Volker Müller from Bentley;-) about our upcoming studio in Stuttgart (http://icd.uni-stuttgart.de). We are currently looking for tools to simulate the geometric behaviour of wooden planks using geodesic curves. I would be very interested in the current grasshopper development.

Dipl.-Ing. Moritz Fleischmann, MArch. (AA)
PHD candidate at ICD, Uni Stuttgart, Prof. Achim Menges

Permalink Reply by David Rutten on July 8, 2014 at 8:11am

There's nothing in Rhino that can compute that, but you can probably use Kangaroo to simulate it.

David Rutten

david@mcneel.com

Permalink Reply by Daniel Piker on July 8, 2014 at 1:29pm

Here's a Mesh geodesic with Kangaroo. Probably not the fastest way to do this, and accuracy depends on how finely you subdivide your polyline, but I do think it's kind of fun to see the length minimizing property of geodesics in such a direct way.

Also - if you wanted to input only a start point and direction, and trace from there instead of giving both start/end points, I imagine it would be a very simple thing to script.

Attachments:

MeshGeodesic.gh, 18 KB

Permalink Reply by Vicente Soler on July 8, 2014 at 4:09pm

Here's a scripting component that does something similar without the interactivity.

Permalink Reply by Vicente Soler on July 8, 2014 at 5:08pm

Updated the script, no visible changes, trying to force myself to use more proper coding conventions and stuff.

Attachments:

geodesicmesh01.gh, 10 KB

Permalink Reply by Andrew Kudless on July 9, 2014 at 12:29am

Daniel,

That is such a nice and simple definition. I've been thinking about this for awhile and reading papers on mesh geodesics and completely forgot about how Kangaroo could be used for this. Nice!

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