# Grasshopper **URL:** https://femdesign.discourse.group/c/help/grasshopper/5.md [Latest](https://femdesign.discourse.group/latest.md) · [Categories](https://femdesign.discourse.group/categories.md) · [Tags](https://femdesign.discourse.group/tags.md) --- ## [About the Grasshopper category](https://femdesign.discourse.group/t/about-the-grasshopper-category/11)
**Author:** [@FEM-Design](https://femdesign.discourse.group/u/FEM-Design)\ **Replies:** 0
Ask question related to Grasshopper in this category --- ## [PointLoad - Eccentricity](https://femdesign.discourse.group/t/pointload-eccentricity/620)
**Author:** [@AndreiM](https://femdesign.discourse.group/u/AndreiM)\ **Replies:** 2\ **Last updated:** [14 October 2026 06:49 UTC](https://femdesign.discourse.group/t/pointload-eccentricity/620 "2026-10-14T06:49:58Z")
Hey I’m trying to access the eccentritcity feature for loads in FEM-Design through Grasshopper, but so far I haven’t been able to find a way to do it. Is this function currently exposed in the FEM-Design API? If not, d… --- ## [Combination method for Load groups](https://femdesign.discourse.group/t/combination-method-for-load-groups/438)
**Author:** [@Poja](https://femdesign.discourse.group/u/Poja)\ **Replies:** 41\ **Last updated:** [5 October 2026 13:10 UTC](https://femdesign.discourse.group/t/combination-method-for-load-groups/438 "2026-10-05T13:10:41Z")
Hi! Is there a way to access all these options from GH? --- ## [Load groups - subgroups with moving load](https://femdesign.discourse.group/t/load-groups-subgroups-with-moving-load/76)
**Author:** [@IdaLea](https://femdesign.discourse.group/u/IdaLea)\ **Replies:** 5\ **Last updated:** [10 September 2026 07:58 UTC](https://femdesign.discourse.group/t/load-groups-subgroups-with-moving-load/76 "2026-09-10T07:58:09Z")
Hi, I am trying to use grasshopper to create a FEM model for a train station and is therefore interested in creating moving loads that are categorized as subgroups in the load group module. Now, when I add moving loads… --- ## [PTCShape component for Slabs \[SOLVED\]](https://femdesign.discourse.group/t/ptcshape-component-for-slabs-solved/434)
**Author:** [@netsonicyxf](https://femdesign.discourse.group/u/netsonicyxf)\ **Replies:** 17\ **Last updated:** [15 July 2026 09:50 UTC](https://femdesign.discourse.group/t/ptcshape-component-for-slabs-solved/434 "2026-07-15T09:50:41Z")
The current PTCShape component is good for shape in single span beam. But for multispan continious beam, there are several issues: Some tendons in multispan continious beam do not start at the start point of the beam,… --- ## [Maximum of Load Groups Results - GH \[SOLVED\]](https://femdesign.discourse.group/t/maximum-of-load-groups-results-gh-solved/606)
**Author:** [@Arun\_N\_Dinesh](https://femdesign.discourse.group/u/Arun_N_Dinesh)\ **Replies:** 4\ **Last updated:** [15 June 2026 08:35 UTC](https://femdesign.discourse.group/t/maximum-of-load-groups-results-gh-solved/606 "2026-06-15T08:35:14Z")
Hi, I am trying to retrieve the results for the “maximum of load groups” using GH for moving loads; however, it seems that calling the “maximum of load groups” results is not possible through GH components. Could anyone… --- ## [Concentration of support forces](https://femdesign.discourse.group/t/concentration-of-support-forces/607)
**Author:** [@perbhagen](https://femdesign.discourse.group/u/perbhagen)\ **Replies:** 4\ **Last updated:** [10 June 2026 13:56 UTC](https://femdesign.discourse.group/t/concentration-of-support-forces/607 "2026-06-10T13:56:00Z")
Hi! I have modelled a column consisting of 4 diagonal elements with stiffening elements between these. As for now, they are modelled with rigid supports at the end of the diagonal elements. However, I would like to cent… --- ## [Access to Nodal masses in Grasshopper \[SOLVED\]](https://femdesign.discourse.group/t/access-to-nodal-masses-in-grasshopper-solved/603)
**Author:** [@Krisjanis](https://femdesign.discourse.group/u/Krisjanis)\ **Replies:** 4\ **Last updated:** [15 April 2026 12:12 UTC](https://femdesign.discourse.group/t/access-to-nodal-masses-in-grasshopper-solved/603 "2026-04-15T12:12:27Z")
Hi, I’m trying to find a way to access Nodal masses using the FEM-Design Grasshopper API so I can compute the mass moment of inertia I\_z​ within the script. So far, the only solution I’ve found is to manually export… --- ## [Shell Deconstruct - FEM-Grasshopper - Shift in Coordinates \[SOLVED\]](https://femdesign.discourse.group/t/shell-deconstruct-fem-grasshopper-shift-in-coordinates-solved/601)
**Author:** [@Arun\_N\_Dinesh](https://femdesign.discourse.group/u/Arun_N_Dinesh)\ **Replies:** 5\ **Last updated:** [9 April 2026 10:08 UTC](https://femdesign.discourse.group/t/shell-deconstruct-fem-grasshopper-shift-in-coordinates-solved/601 "2026-04-09T10:08:50Z")
Hi, While deconstructing the shell from an existing FEM model, I noticed that the surface points are uniformly shifted by 0.176 m in the X and Y coordinates. Has anyone experienced this behavior, or can someone explain … --- ## [Composite Slab or Sandwich panel \[SOLVED\]](https://femdesign.discourse.group/t/composite-slab-or-sandwich-panel-solved/588)
**Author:** [@Ravi](https://femdesign.discourse.group/u/Ravi)\ **Replies:** 2\ **Last updated:** [31 March 2026 04:33 UTC](https://femdesign.discourse.group/t/composite-slab-or-sandwich-panel-solved/588 "2026-03-31T04:33:58Z")
Hi, I’m trying to model a composite slab in FEM Design, but it seems the option is not available, or I may be missing something. One approach I’m considering is to model the composite section in Grasshopper, extract th… --- ## [PTC load case in a load combination via the Grasshopper API](https://femdesign.discourse.group/t/ptc-load-case-in-a-load-combination-via-the-grasshopper-api/594)
**Author:** [@kolnas](https://femdesign.discourse.group/u/kolnas)\ **Replies:** 2\ **Last updated:** [24 March 2026 15:12 UTC](https://femdesign.discourse.group/t/ptc-load-case-in-a-load-combination-via-the-grasshopper-api/594 "2026-03-24T15:12:02Z")
I am looking for a way to include the forces from the PTC (post-tensioning) cables in my load combinations entirely through Grasshopper. Currently, only the loads explicitly defined in the Grasshopper script are being i… --- ## [Only one load combination is connected to FEM Design \[SOLVED\]](https://femdesign.discourse.group/t/only-one-load-combination-is-connected-to-fem-design-solved/593)
**Author:** [@perbhagen](https://femdesign.discourse.group/u/perbhagen)\ **Replies:** 4\ **Last updated:** [20 March 2026 14:01 UTC](https://femdesign.discourse.group/t/only-one-load-combination-is-connected-to-fem-design-solved/593 "2026-03-20T14:01:13Z")
Hi! I have defined 4 different load combinations. However, only one appears in my FEM Design analysis. Are there any specific reasons to why this happens? Thanks in advance! Best regards, Per --- ## [Read results from file](https://femdesign.discourse.group/t/read-results-from-file/585)
**Author:** [@Ravi](https://femdesign.discourse.group/u/Ravi)\ **Replies:** 1\ **Last updated:** [16 February 2026 10:20 UTC](https://femdesign.discourse.group/t/read-results-from-file/585 "2026-02-16T10:20:02Z")
Hi @AndreiM , Thank you for providing the solution. I am still getting familiar with Grasshopper, so please excuse me if this is a basic question. For large models, the FEM solver generates the mesh automatically when… --- ## [Cannot perform analysis due to stiffness error](https://femdesign.discourse.group/t/cannot-perform-analysis-due-to-stiffness-error/582)
**Author:** [@RSBNO](https://femdesign.discourse.group/u/RSBNO)\ **Replies:** 8\ **Last updated:** [4 February 2026 14:22 UTC](https://femdesign.discourse.group/t/cannot-perform-analysis-due-to-stiffness-error/582 "2026-02-04T14:22:52Z")
Good morning, I am having trouble understanding what this error means ‘there are no stiffness points to calculate’. I the model that i have created in GH, i have defined supports and motions, which are visible in FEM-d… --- ## [Brep surface is not planar \[SOLVED\]](https://femdesign.discourse.group/t/brep-surface-is-not-planar-solved/579)
**Author:** [@netsonicyxf](https://femdesign.discourse.group/u/netsonicyxf)\ **Replies:** 7\ **Last updated:** [23 January 2026 12:00 UTC](https://femdesign.discourse.group/t/brep-surface-is-not-planar-solved/579 "2026-01-23T12:00:55Z")
The grasshopper says it’s planar, but FEM-Design says it’s not. planar surface.gh (10.3 KB) --- ## [SurfaceLoad.Deconstruct & Update Slab surface load \[SOLVED\]](https://femdesign.discourse.group/t/surfaceload-deconstruct-update-slab-surface-load-solved/572)
**Author:** [@Arun\_N\_Dinesh](https://femdesign.discourse.group/u/Arun_N_Dinesh)\ **Replies:** 10\ **Last updated:** [13 January 2026 06:10 UTC](https://femdesign.discourse.group/t/surfaceload-deconstruct-update-slab-surface-load-solved/572 "2026-01-13T06:10:58Z")
Hi, Can someone help me understand what ‘q1’, ‘q2’, and ‘q3’ represent, and how to update the applied surface loads on slabs after deconstructing? When I use ‘SurfaceLoad.Uniform’ to add new surface loads to an exist… --- ## [Assigning selfweight of structure \[SOLVED\]](https://femdesign.discourse.group/t/assigning-selfweight-of-structure-solved/575)
**Author:** [@perbhagen](https://femdesign.discourse.group/u/perbhagen)\ **Replies:** 2\ **Last updated:** [9 January 2026 10:15 UTC](https://femdesign.discourse.group/t/assigning-selfweight-of-structure-solved/575 "2026-01-09T10:15:31Z")
Hi! Since I’m quite new to both FEM Design and FEM Design API, I am struggling with a bit basic stuff.. Would it be possible to get any guidance on how I could assign self weight to my structure in Grasshopper? … --- ## [How can I make a connection between a beam and column?](https://femdesign.discourse.group/t/how-can-i-make-a-connection-between-a-beam-and-column/570)
**Author:** [@perbhagen](https://femdesign.discourse.group/u/perbhagen)\ **Replies:** 7\ **Last updated:** [8 January 2026 13:35 UTC](https://femdesign.discourse.group/t/how-can-i-make-a-connection-between-a-beam-and-column/570 "2026-01-08T13:35:22Z")
Hi! I want to model a beam structure (truss system) that connects to a column (also a truss system). Is it possible to get any tips on how I can model a connection between the two? Not sure what I should present of mater… --- ## [Rotate sections \[SOLVED\]](https://femdesign.discourse.group/t/rotate-sections-solved/576)
**Author:** [@perbhagen](https://femdesign.discourse.group/u/perbhagen)\ **Replies:** 1\ **Last updated:** [8 January 2026 13:31 UTC](https://femdesign.discourse.group/t/rotate-sections-solved/576 "2026-01-08T13:31:43Z")
Hi! I am struggling with rotating the sections correctly. My thought is to use the LocalY value in some way. However, I am not able to figure out how it should be used. Any tips? I would like to rotate the elements lik… --- ## [Can't find custom section \[SOLVED\]](https://femdesign.discourse.group/t/cant-find-custom-section-solved/569)
**Author:** [@perbhagen](https://femdesign.discourse.group/u/perbhagen)\ **Replies:** 2\ **Last updated:** [16 December 2025 07:55 UTC](https://femdesign.discourse.group/t/cant-find-custom-section-solved/569 "2025-12-16T07:55:51Z")
Hi, I have created my own section type and exported the section library. However, I am not able to find the section through the SectionDatabase. Does anybody know what I am doing wrong here? I can’t find the section in… --- ## [Modelling Fibre reinforced polymer jacket in Fem design](https://femdesign.discourse.group/t/modelling-fibre-reinforced-polymer-jacket-in-fem-design/565)
**Author:** [@RSBNO](https://femdesign.discourse.group/u/RSBNO)\ **Replies:** 3\ **Last updated:** [12 December 2025 09:26 UTC](https://femdesign.discourse.group/t/modelling-fibre-reinforced-polymer-jacket-in-fem-design/565 "2025-12-12T09:26:09Z")
Any idea how one would go about modelling a column with FRP jacket in FEM-design API? I wish to test added stiffness in the column and visualize stress distribution in the column. How would i ensure that the column and… --- ## [FEM-Design API install not working \[SOLVED\]](https://femdesign.discourse.group/t/fem-design-api-install-not-working-solved/566)
**Author:** [@SigveCOWI](https://femdesign.discourse.group/u/SigveCOWI)\ **Replies:** 1\ **Last updated:** [4 December 2025 14:21 UTC](https://femdesign.discourse.group/t/fem-design-api-install-not-working-solved/566 "2025-12-04T14:21:44Z")
Hi, I have attached a screenshot of the error code that appears after restarting Rhino/Grasshopper after installation of FEM-Design v24.2.2 on Rhino 7 via Package Manager. The already existing FemDesign.1.2.0.gha was re… --- ## [RCBarUtil can only retrieve section Utilization \[SOLVED\]](https://femdesign.discourse.group/t/rcbarutil-can-only-retrieve-section-utilization-solved/562)
**Author:** [@RSBNO](https://femdesign.discourse.group/u/RSBNO)\ **Replies:** 2\ **Last updated:** [25 November 2025 13:13 UTC](https://femdesign.discourse.group/t/rcbarutil-can-only-retrieve-section-utilization-solved/562 "2025-11-25T13:13:40Z")
I am trying to get my head around, why the RCbarUtil component can only retrieve utilization rates from the section. What i want to now is the utilization of the rebar and concrete. I am running the API in grasshopper, … --- ## [Surface Variable Load must contain 3 values \[SOLVED\]](https://femdesign.discourse.group/t/surface-variable-load-must-contain-3-values-solved/553)
**Author:** [@Pomer](https://femdesign.discourse.group/u/Pomer)\ **Replies:** 1\ **Last updated:** [2 October 2025 08:00 UTC](https://femdesign.discourse.group/t/surface-variable-load-must-contain-3-values-solved/553 "2025-10-02T08:00:11Z")
Hello, I am trying to model a circular shaft using FEM API. However, the construct plate element input requires a planar surface. Is there anyway to have it accept a non-planar surface? I then tried to change my circle… --- ## [Shear control region \[SOLVED\]](https://femdesign.discourse.group/t/shear-control-region-solved/544)
**Author:** [@Hilde](https://femdesign.discourse.group/u/Hilde)\ **Replies:** 4\ **Last updated:** [29 September 2025 10:45 UTC](https://femdesign.discourse.group/t/shear-control-region-solved/544 "2025-09-29T10:45:32Z")
Hi, In Grasshopper, it is possible to change the Config. settings for FEM-Design. However, I would also like to change some of the other settings for concrete design. I was wondering if it is possible to create a compon… --- ## [Eccentricity of the bar](https://femdesign.discourse.group/t/eccentricity-of-the-bar/530)
**Author:** [@Weigu](https://femdesign.discourse.group/u/Weigu)\ **Replies:** 1\ **Last updated:** [16 July 2025 12:36 UTC](https://femdesign.discourse.group/t/eccentricity-of-the-bar/530 "2025-07-16T12:36:23Z")
It doesnt work with eccentricity of the bar. --- ## [Running old gh-definitions created with v22.7.0 \[SOLVED\]](https://femdesign.discourse.group/t/running-old-gh-definitions-created-with-v22-7-0-solved/524)
**Author:** [@Bohman](https://femdesign.discourse.group/u/Bohman)\ **Replies:** 3\ **Last updated:** [17 June 2025 12:17 UTC](https://femdesign.discourse.group/t/running-old-gh-definitions-created-with-v22-7-0-solved/524 "2025-06-17T12:17:34Z")
Hi! When trying to run an old gh-script for the FD-plugin version 22.7 the following new error appears (translated to english): “1. Solution exception: ReadSubtree() can only be called when the reader is positioned on a… --- ## [Add loads on an existing model](https://femdesign.discourse.group/t/add-loads-on-an-existing-model/505)
**Author:** [@IvanAP](https://femdesign.discourse.group/u/IvanAP)\ **Replies:** 6\ **Last updated:** [10 June 2025 16:44 UTC](https://femdesign.discourse.group/t/add-loads-on-an-existing-model/505 "2025-06-10T16:44:09Z")
I have an FD model over a floor and I’m going to load it with a point load. The point load can end up anywhere on the floor and I’m trying to find the maximum internal forces where I’ve considered all possible placement… --- ## [Optimise cross section \[SOLVED\]](https://femdesign.discourse.group/t/optimise-cross-section-solved/501)
**Author:** [@Magnindre](https://femdesign.discourse.group/u/Magnindre)\ **Replies:** 4\ **Last updated:** [13 May 2025 07:51 UTC](https://femdesign.discourse.group/t/optimise-cross-section-solved/501 "2025-05-13T07:51:08Z")
I’m using Grasshopper to create a model and using Desig.Define to optimize the cross-sections. When I use this function, it only selects from HEA sections. I want it to go through several types of cross-sections—not all,… --- ## [Bar element length \[SOLVED\]](https://femdesign.discourse.group/t/bar-element-length-solved/499)
**Author:** [@Poja](https://femdesign.discourse.group/u/Poja)\ **Replies:** 1\ **Last updated:** [8 May 2025 12:04 UTC](https://femdesign.discourse.group/t/bar-element-length-solved/499 "2025-05-08T12:04:06Z")
Hi! I don’t manage to change the number of divisions for bar elements, and how can I assign different divisions for different parts VÖN\_demo.gh (26.2 KB) cmdglobalcfgDemo.xml (2.2 KB) ? [Next page](https://femdesign.discourse.group/c/help/grasshopper/5.md?page=1)