Release Notes for IFC 4.3 Extension for Autodesk® Civil 3D® 2026
The IFC 4.3 Extension for Autodesk® Civil 3D® provides commands for importing and exporting IFC files in Civil 3D drawings. Learn more.
| New Features |
|---|
| Added documentation and samples to the install directory. C:\Program Files\Autodesk\ApplicationPlugins\Civil3D_IFC-2026.bundle\Contents\Samples. |
| Added support of linear placement of objects by allowing attachment to one or more alignments. |
| Added support to inject properties from an external *.csv file at Project, Root Element, Prospector Folder, and spatial structure levels. |
| Added support of additional export AutoCAD Surfaces. |
| Added the ability to extract volume properties for all Solids and Bodies. |
| Added the ability to export gravity and pressure network NULL structures. |
| Added the ability to enable identification of shading transparency from a Civil 3D entity. |
| Added a configuration to nominate georeferencing without distortion using the IfcRigidOperation command. |
| Improved CANT, Alignment and Profile compliance with buildingSMARTS new documentation. |
| Improved handling of Coordinate Systems. |
| Improved handling of Civil 3D Styles. |
| Improved handling of excluded for export entities and excluded parents of objects being exported. |
| Improved handling of Profiles during export. |
| Improved corridor shape name mapping. |
| Improved support for feature line properties. |
| Improvement to generation of placement relative to host element. |
| Improved support of user nominated mapping. |
| Fixed Issues |
|---|
| Updated multiple compliance changes identified when working with buildingSMARTS on their certification program and their clarification of definitions. |
| Brought STEP header compliance in line with buildingSMARTS latest rules. |
| Fixed an issue when nominating an IfcProject Phase attribute from a configuration file. |
| Fixed an import issue that could occur with some coordinate systems. |
| Made improvements to spatial breakdown compliance. |
| Assigned units to the exported values of Area, Length and Volume property sets. |
| Fixed missing site issues that could occur on import. |
| Fixed an issue in which unique GUIDs were not enforced on attributes. |
| Improved the representation of exported styled Cogo points. |
| Known Issues: reported by validate.buildingSMART.org |
|---|
| All tests are based on release 0.7.5 of the buildingSMART website. |
| Industry Practices: ALS017. Alignment vertical segment geometric continuity This warning is dependent on the number of decimal places used in the export. |
| Normative IFC Rules: ALB022. Alignment agreement on number of segments The error occurs on non-continuous alignments or profiles. ALB012. Alignment vertical segment radius of curvature This error is dependent on the number of decimal places used in the export. IFC105. Resource entities need to be referenced by rooted entity This error can be caused by issues with entity and spatial structure mappings. GEM112. No duplicated points within an indexed poly curve We are investigating this error. |
Installation
Who Should Install This Extension?
You can apply this extension to the following Autodesk products running on all supported operating systems and languages. Be sure to install the correct extension for your software.
- Autodesk Civil 3D 2026 or later
General Installation Information
You can use the Autodesk Access application or the Product Update section at manage.autodesk.com to find and install the correct extension for your product. It is recommended that you have the latest available update to Autodesk Civil 3D 2026 applied before installation.
As you prepare to install this extension, keep the following in mind.
Back Up Custom Files
It's recommended that you back up all custom CUIX, MNR and MNL files in Civil 3D before you apply this extension.
Administrative Privileges
To apply this extension, you must have privileges to install and uninstall products. During installation or uninstallation, you may be prompted for the original installation media or a network image.
Network Deployment
Administrators can deploy this extension over a network using the Deployment Wizard.
Close the Application
It's required that you close Autodesk Civil 3D 2026 before proceeding with the installation of this extension.
Reboot
After you install, it is recommended to reboot your system even if not prompted.
About Your Product
After you install, product information is displayed in the About dialog box.
Installation Instructions
Apply This Extension to a Stand-Alone Installation
Follow these instructions to install this extension on a single computer.
- Download the extension and save it to any folder.
- Close all running Autodesk applications.
- Find the folder where you saved the extension and double-click the executable (.exe) file.
Apply This Extension Through a Local Network
Follow these instructions to install this extension on multiple computers using your local network.
- Download this extension and save it to any shared folder on your local network.
- Close all running Autodesk applications.
- Find the shared folder where you saved the extension and double-click the executable (.exe) file.
Apply This Extension to a Network Administrative Image
The following method of distributing IFC 4.3 Extension for Autodesk® Civil 3D® applies only to administrative images created with the Autodesk Civil 3D 2026 Network Installation wizard. After you complete this procedure, any new deployments of Autodesk Civil 3D 2026 will have the extension applied to them automatically. For information on creating and updating a Network Administrative Image. Detailed installation information can be found in the Autodesk Civil 3D installation help topics.
To apply the IFC 4.3 Extension for Autodesk® Civil 3D® extension to an existing Autodesk Civil 3D 2026 administrative image:
- Download this extension and save it to any shared folder on your local network.
- Close all running Autodesk applications.
- On the workstation where you initially created the Autodesk Civil 3D 2026 deployment, open the Tools folder and double-click the Create & Modify a deployment shortcut icon.
- Follow the wizard to the product configuration screen and expand the Include additional software accordion.
- In the Additional Software section, click Add and browse to the location where you saved the extension.
- Collapse the Include additional software accordion and click the Create button.
Now any new deployments of Autodesk Civil 3D 2026 will have the extension applied to them automatically.
Uninstall This Extension
This extension can be uninstalled through the Program and Features section of the Microsoft® Windows® Control Panel.
Follow these instructions to uninstall this extension on a single computer.
- Insert the product media (for example, the Autodesk Civil 3D installation media) or make sure the installation source files are available.
- In Windows Control Panel > Program and Features, click on IFC 4.3 Extension for Autodesk® Civil 3D® and choose the Uninstall option.