algorithmic modeling for Rhino


Geometry Gym BIM

BIM (Building Information Modeling) enhancements for Rhino and Grasshopper, import/export to Revit, Digital Project, Bentley and Archicad amongst others.  Also Structure modeling (including analytic) and Computational Geometry Tools such as mesh relaxation/inflation and tessellation tools.

Members: 1477
Latest Activity: 19 hours ago


Installation instructions are located in this discussion,

Discussion Forum

Error in Revit 4 Replies

Hi All,I have a problem with import of ifc file in Revit (created in grasshopper). See screenshot included. Does anyone know how I can solve this problem?Thanks,HalimContinue

Started by Halim Yilmaz. Last reply by Halim Yilmaz 19 hours ago.

Mesh join and parametric loading of elements 1 Reply

Hi everyone, I am trying to join two meshes and subsequently bake the structure to GSA in order to perform an analysis. I am facing two problems though. First of all I am having a hard time joining…Continue

Started by Georgios Drosos. Last reply by Jon Mirtschin Aug 5.

Null Reference Exception 1 Reply

Hi everyone!I get the following error when importing an IFC, but I have been using this file lately without problems. The previous IFCs that I had baked work properly. Any ideas? Thank you!…Continue

Started by AMALIA VRANA. Last reply by Jon Mirtschin Jul 6.

GSA Bake components Doesn't work

Hi JonI am trying to use the GSA plugin for grasshopper. I don’t know while everything seems to be correct in algorithm but why it can't bake the model to GSA. Could you plz take a look and see if…Continue

Started by Ghazal Javidan Jul 4.

ggGSA 2 Replies

HiI have been practicing Michael van Telgen's intruduction guide.I was just following the his algorithm and I finished, but…Continue

Started by Kim Geon Ung. Last reply by Kim Geon Ung Jul 4.

IFC to Grasshopper 4 Replies

Hey JonYou have provided lots of examples of how to export IFC with GG to all kinds of software. I would appreciate some examples to read IFC-files with GG in Grasshopper.The workflow: "Revit…Continue

Started by Kristoffer Negendahl. Last reply by Carlo Beltracchi Jun 30.

Grasshopper3d Geodesic Dome Structure Generator (GGDSG) Geometry Gym 02.05.12 9 Replies

Hi all,Here is my Grasshopper3d Geodesic Dome Structure Generator (GGDSG) With Geometry Gym .gh File. …Continue

Tags: Structure, Geometry, Gym, Grasshopper, Geodesic

Started by Paul Goodship. Last reply by 2DCube Jun 23.

Geometry Gym Adaptive Component: IFC Representation MAP 3 Replies

Hi,This is probably very simple, but I am trying -unsuccessfully- to import in Revit a modular facade system using adaptive components. In order to understand the process, I first tried to import…Continue

Started by AMALIA VRANA. Last reply by Jon Mirtschin Jun 21.

Comment Wall


You need to be a member of Geometry Gym BIM to add comments!

Comment by simone moroni yesterday

Hello, I'm trying to bake grasshopper 2D structure (is a section of my structural pannel) with the comand "ggSAPbakemodel" sap, but when I select "open model in SAP" it doesn't work and rhino goes to crash. I've SAP 14  version, is it too old for work with geometry gym?

Thank you very much for reply

Comment by lee ji yonh on May 9, 2016 at 1:14am

Hi Jon 

I see your post about IFC script(python).

At first, thank you about sharing your research.

I see your IFC python sample file.

But when I opened IFC python file, i happened error message.

Suddenly i wonder this cause.

Also, i am likely to studying IFC python script.

so I request you why this problem happened.

and how do i script correct for operating this component?

Comment by Jon Mirtschin on March 21, 2016 at 3:10am

Hi Derk,

If you add an analysis case, then you will get results.

I've emailed you the definition.



Comment by Derk Bos on March 20, 2016 at 3:06pm

Hi Jon,

I'm trying to do a non lineair analysis on a tensegrity structure in GeomGym. For some reason, however, I don't obtain any results.

The ggGSASolver component doesn't give any error message, but for some reason the analysis doesn't run in GSA. When I do the analysis manually in GSA it does work however. 

Do you have an idea what the problem could be?

Kind regards,


Comment by Jon Mirtschin on February 28, 2016 at 2:53am

Is this error in v18 plugin?  Can you start a discussion thread or post to this one and attached your model (or a sample of it).



Comment by Qi WU on February 26, 2016 at 2:14pm

Hi Clara, I don't see a profile library, that's way I am using a panel.

Here is error: 1. Solution exception:Object reference not set to an instance of an object.

I don't think it's a input issue, cz it's a solution exception.

Comment by ClaraML on February 26, 2016 at 10:38am
What's the error in the red globe? Does it work if you use the profile library instead of a panel for set the profile?
Comment by Qi WU on February 26, 2016 at 10:26am

Hi Jon, For the latest version of ggSAP, the ggSAPCreateFrameProp component is not working properly. Is that a bug? It was working fine in your v17.1.1.

Comment by ClaraML on February 17, 2016 at 2:04am

I'm having a problem with GG and SAP2000. I'm using SAP2000 18, not 17. And I've detected at least one component (the library material) that search for information in the SAP17 route. Is there any way for changing that route and make the component search in the correct route? If not, I can duplicate the SAP18 folder and rename it like SAP17, so the component could find the information. Do you think it will work?

Comment by lee ji yonh on February 2, 2016 at 8:52pm

Hi Jon,

Currently i have a problem to create a column. I don't know what i should do. how do you make a logic? Now this problem's message is "overcast will not be column type"

Kind Regard, 

Jiyong Lee


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