Frequently Asked Questions (FAQ)

Helpful Questions & Answers

  • Frequently Asked Questions (FAQs)

Search FAQ

Show Filter Hide Filter

Customer Support 24/7

Knowledge Base

In addition to personal support, we offer resources 24/7 through our website.


Receive information including news, useful tips, scheduled events, special offers, and vouchers on a regular basis.

1 - 9 of 9

Sort by:


  • Answer

    Rhino 7 will be supported as of the program version 5.25.01. You can install the plug-in as follows:

    1. Go to the following folder, depending on your system:

    32-bit system: "C:\Program Files\Common Files\Dlubal\DLInstaller"
    64-bit system: "C:\Program Files (x86)\Common Files\Dlubal\DLInstaller"

    2. Run DLInstaller.exe.

    3. In the "Registration" tab, select your program version and click "Register."

    4. If this does not solve the problem, please send us the report that is generated via "Show Log."
  • Answer

    Meshes are not supported in RFEM because they are not "smooth surfaces," but consist of individual facets, see the third paragraph under Meshes vs. NURBS:

    A mesh represents 3D surfaces as a series of discreet facets, [...]

    As an appropriate solution, we recommend to use the Rhino command "MeshToNurbs."

    Image 01 - Rhino Command "MeshToNurbs"

    The resulting polysurface can be exported to RFEM.

  • Answer

    To use our Grasshopper plugin, a COM license is not required (although the communication takes place via the COM interface).

    There is an interesting webinar about the "data exchange between Rhino/Grasshopper and RFEM."
  • Answer

    3ds files do not contain any scale information. If you know the maximum dimensions of your object, you can import the visual object at the correct scale.

    Figure 01 - Envelope Dimension in Rhino 6

    The maximum dimension of our visual object is 10 m. We can use this value and define it as an absolute, maximum size in the settings when inserting the visual object. Furthermore, you can select various points where the visual object can be positioned. Our structure modeled previously fits exactly the desired location.

    Figure 02 - Insert Visual Object - Settings

    As of the program version xx.23.01, you can use the visual objects for the export as a terrain model or an environment model for the calculation in RWIND Simulation.

    Figure 03 - Simulate and Generate Wind Loads - Settings

    Therefore, these objects are also used in the calculation of all load cases in the background.

    Figure 04 - Results of RWIND Simulation

  • Answer

    Download the following link:


    (1) Please close RFEM and Rhino.
    (2) Open the ZIP folder and double click the *.rhi file.
    (3) Select the "Anyone who uses this computer" option in the Rhino Package Installer.

  • Answer

    After the successful installation of the interface, the RFEM5 toolbar is available. The corresponding components allow you to control the export to RFEM. To do this, simply drag and drop them into the programming interface. The import from RFEM is not possible.

    The "RFEM 5 COM Component" allows for communication between Grasshopper and RFEM. As soon as you use this component with the geometrical information, the export will begin. An opened RFEM file is expected. It is recommended to use an empty file because the export overwrites all information. The update mechanism is not implemented at the moment. By using "Value List," you can additionally define the unit which is used to describe the geometry. The modifications of tolerances are usually only necessary if the points have been defined very close to each other. You can enter the number to be stored for this in "Panel."
    The "RFEM 5 Member Component" allows you to attach additional information to the geometry (lines, curves). These are considered during the export to RFEM so that the members can be created. The material and cross-section name can be entered in a text box (panel). The member rotation can be defined in [rad] by using "Number Slider." For the definition of member hinges, it is necessary to additionally load the "RFEM 5 Member Hinge Component." The input consists of 6 degrees of freedom which can be controlled individually. For the release of a degree of freedom, it is necessary to define the value "0," and spring constants are expected in the units [N/m] or [Nm/rad]. It is not possible to change the unit. Currently, nonlinearities cannot be specified.
    The "RFEM 5 Surface Component" can be used in a similar way as the "Member" component. A surface is expected when entering the geometry. The material can be attached to them by using the "panel." The surface thickness can be defined in [m] by using the number slider. The stiffness type of the surface can be controlled by "Value List" with the predefined types.
    You can create nodal supports by using the "RFEM 5 Nodal Support Component." On the Input page, you can define the points to be supported. In this case, it is recommended to use the already existing definition nodes of surfaces or lines. All 6 degrees of freedom can be controlled. In this case, the value "0" means a release in the respective direction, "-1" means a fixed support. Spring constants can be defined in the same way as member hinges.

    You can download the Grasshopper file shown in the figure. It is only necessary to activate the "RFEM 5 COM Component."

  • Answer

    In principle, it is very simple to use the interface. After the successful installation, the Dlubal toolbar is available in Rhino. This includes two icons (Export and Import).

    "Import" allows you to import data from RFEM to Rhino. In this case, the whole RFEM model is always imported. No update is necessary. The data is added to the existing structure.
    "Export" allows you to export data from Rhino to RFEM. The entire structure is usually exported. If you only want to export parts of the structure, select them before starting the export. In order to perform the export, it is necessary to open RFEM and create a file. Please note that the export procedure overwrites all existing data of the opened file. Therefore, it is recommended to open an empty file.

  • Answer

    Please make sure that Rhino (version 6.20 or later) is already installed on your computer. Then you can launch the RFEM 5 installation. For this, you need the version 5.21.02 at least. The plug-ins are automatically saved in one of the following directories and also installed.

    C:\Program Files\Common Files\McNeel\Rhinoceros\6.0\Plug-ins\

    Figure 02 - Directory of Plug-ins

    After completing the installation, you can run Rhino and Grasshopper. In both programs, the Dlubal-specific toolbars should be available by now. It is also possible to subsequently attach the Dlubal toolbar for Rhino to the other toolbars (see the video).

    Figure 01 - Dlubal Toolbar

    If Rhino has been installed later than RFEM, the interface is not available. In this case, it is recommended to reinstall RFEM.

  • Answer

    • Interface between RFEM/RSTAB and Autodesk Revit

      RFEM and RSTAB communicate with Revit Structure via a direct interface and allow data to be exchanged. Structures modeled with RFEM and RSTAB can be transferred at the push of a button to Revit Structure.

      RFEM/RSTAB is based on an object-oriented building model and Revit on parametric modeling. Thus, the intelligence of the objects is not lost during the data exchange. This means that you get another equivalent object in Revit or RFEM/RSTAB for a column or beam, and not just a collection of lines.
    • Direct RSTAB/RFEM interface to Autodesk AutoCAD

      The members are exported as lines from RFEM/RSTAB. The layers of these lines contain information about the used cross-sections and materials. When exporting a DXF file from RFEM, it is possible to export the numbering, which is controlled by the navigator, in addition to the entire model - including the FE mesh.

      Another option for exporting from RFEM/RSTAB is to transfer results in the form of isolines to a DXF file. Various elements such as isolines, FE mesh, values, etc. can be specifically selected.

    • Direct RSTAB/RFEM interface to Tekla Structures

      With the directly integrated interface, the analytical model of detailed systems can be transferred easily from Tekla Structures to RFEM/RSTAB.

      The Tekla model can be updated quickly using the direct interface by comparing the modified materials, profiles and coordinates when carrying out modifications in structural engineering. It is also possible to remove construction elements that no longer exist or to add new ones.

    • Interfaces to Rhino & Grasshopper

      Rhino interface: Lines, as well as surfaces including openings, can be transferred to RFEM (export) or imported from RFEM (import). The following line types can be transferred: line, polyline, arc, circle, ellipse, parabola and NURBS. In addition, it is possible to exchange these surface types: plane, rotated surface, and NURBS.

      Grasshopper Interface: This interface enables activation of the Dlubal-Tab in Grasshopper. This includes three components. The 'Surfaces' component allows you to add Dlubal-specific surface properties (material, thickness, surface stiffness type) to 2D geometries. Use the 'Member' component to add member-specific properties (material, cross-section, member rotation) to incoming lines or curves. The third component allows for direct export to RFEM.

    • Other exchange formats

      DXF, IFC, STP (e.g. for Intergraph, Advance Steel, SEMA, Cadwork, HSB-Cad, etc.), DSTV (e.g. for Bocad and Frilo), FEM (Glaser) and CFE (Strakon), XLS (Microsoft EXCEL), CSV, ISM.DGN, DGN (Bentley ISM), DAT, SMLX (Advance Steel), ASF (Nemetschek Allplan), ESF

    A detailed overview of the interfaces and the BIM-oriented planning is available on our website Building Information Modeling (BIM).

    Also, there are also multiple webinars about BIM that you can watch for free to learn more.

Contact us

Contact Dlubal

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0

First steps

First steps

We provide information and tips to help you get started with the basic program RFEM and RSTAB.

Wind Simulation & Wind Load Generation

With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

Your support is by far the best

“Thank you very much for the useful information.

I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. In the industry of structural analysis, I use several software including service contract, but your support is by far the best.”