algorithmic modeling for Rhino

Jon Mirtschin
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Geometry Gym Plug-ins - AEC BIM and Computational Geometry

Grasshopper plug-ins assisting Architectural and Structural modelling including BIM under constant development and improvement.  Computational geometry solvers useful to many other designers.

StructDrawRhino is a Generic Structural…

Posted on April 17, 2010 at 12:00am — 11 Comments

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At 10:53am on February 6, 2019, Tina Irvine said…

Hi Jon, 

I'm trying to use the ggstage in Grasshopper to get the relevant stages into GSA.

However, it doesn't seem to like the active elements I'm inputting. I keep getting the error message '1. Solution exception:Object reference not set to an instance of an object.' Is there a trick to getting this to work? I also can't fed the ggStageProp into GSA either?

Can you help? 


At 12:58pm on August 9, 2018, foodove said…

sry~and my email is, ty~

At 11:54am on August 9, 2018, foodove said…

Dear Jon,

after repairing ggRhino5Karamba1.3.0 v0.1.10, it shows "1. Solution exception: Unlicensed!!! To activate full functionality please request a trial license by running command ggKarambaZZLicenseRequest
Run Rhino command ggKarambaZZLicenseRequest or contact Jon!", I ran Rhino command ggKarambaZZLicenseRequest but it doesn't work. Could you please help me to solve it? it is a little bit urgent bc I'm doing my Thesis project with it...many thanks!



At 10:01am on February 16, 2018, Scabinus said…
Dear Jon,
I find your ggmeshtobrep command in rhino very usefull, why you did not develop it for
At 8:52am on June 23, 2017, Omid Karami said…

Hi jon

I downloaded your Geometry gym Plug-in, unfortunately it does not work because its license expire. How should I do? And I have one more question: How does gtt Plug-in work?

My email address is:

Yours Sincerely


At 12:27pm on October 20, 2016, Sebastien de Wit said…

Dear Jon,

I have some serious troubles getting the surface properly meshed with equal lengths, prior to the form finding part. Perhaps Kangaroo itself is able to do this? Hope you can help because meshing odd surfaces instead of rectangular shapes is not often shown on the forum.

Yours sincerely,


At 3:42am on July 18, 2014, shahryar said…

Dear Jon,

I am trying to import one gbXML file which was exported by Revit .I have  loaded it in Ecotect to apply material. Now, I am planning to import in Rhino to analysis in grasshopper. I have downloaded geometrygym plugin but it does not work in Rhino and just appears in grasshopper. Would you please guide and help me by offering any information how I can to import gbXML files to Rhino.

Yours sincerely,

At 10:41am on August 27, 2013, Gabriel Áh said…

hey Jon, 

 Im trying to use geo gym, but this legend pops out:

where can i get the free evaluation code and then extend it to the educational version

by the way thanks for sharing, and congrats for the hard work



At 12:43pm on June 7, 2013, Mehdi Hasanzadeh Samadi said…

is there any plug-in for revit 2013 32-bit too ? i just see the 64-bit version !!

At 3:36am on January 16, 2013, trung1133 said…


i am not able to learn anything from the example files as some things turn red!!! then back to orange if i remove the NAME (N) i.e. nameless component

please help






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