Autodesk Civil 3D 2026.0 with Oflfline Help & Content

Tech Preview: Autodesk Drainage Analysis for Civil 3D (What's New in 2026)
Drainage Analysis for Civil 3D 2026 introduces a Technical Preview of an upcoming toolset designed to integrate the drainage design environment of Civil 3D with InfoDrainage analysis services hosted in the cloud. This extension enhances drainage design capabilities by providing new workflows for the design of ponds, underground storage devices, and open channels, as well as improved catchment delineation with expanded runoff method support.


When a drainage engineer prepares to analyze a system, the analysis can be initiated directly within Civil 3D. This allows for the utilization of various rainfall and runoff methods and facilitates the execution of multiple storm event simulations. Upon completion of the analysis, engineers can validate results, including any warnings or errors, before applying them to the drainage components within the drawing and exporting a comprehensive analysis report.


To support the analytical workflows, a rainfall manager for the creation and management of rainfall events is included.


How to Participate in the Drainage Analysis for Civil 3D Tech Preview
Join the Drainage Analysis for Civil 3D program. It allows direct access to the product team and gives you a unique opportunity to test new functionality and workflows.

3D Model Viewer (What's New in 2026)
The new Model Viewer facilitates high-performance and isolated 3D review of selected objects within the Civil 3D environment. Open the viewer, select objects, and freely navigate those elements of your drawing.

Review complex objects such as corridors and subassemblies in a new way that provides better insight without detracting from regular workflows.


Infrastructure Design Review in Autodesk Construction Cloud (What's New in 2026)


Civil Tools for Autodesk Construction Cloud (ACC) introduces alignment awareness and civil infrastructure-specific design review workflows for ACC. The tools enhance the design review process for infrastructure projects by providing the ability to interact with models in the context of project alignments.

Within the Docs viewer, you can navigate along alignment/profile geometry, track their position with stationing information, create perpendicular cuts to the alignments, and query the model. This allows BIM/CAD Managers, Project Managers, QA/QC personnel, and civil/design engineers, to collaborate on infrastructure projects within ACC.

New in Project Explorer (What's New in 2026)

Rail CANT Information


- The following Rail CANT values have been added to the calculated stations list and are available reports and tables.
. LateralAcceleration
. CantGradient
. EquilibriumCant
. EquilibriumCantGradient
. EquilibriumCantVerticalSpeed
. CantDeficiency
. CantDeficiencyGradient
. CantDeficiencyVerticalSpeed
. CantRatio
. CantJerk
. VerticalSpeed
Object Set Actions from the Command Line
- Run all Object Sets or run by index, name, or set type by entering RunProjectExplorerActions at the command line.

New in Surface Workflows (What's New in 2026)New in Dynamo for Civil 3D (What's New in 2026)


Partial Surface Reference Creation
- Create partial surfaces by defining a boundaries to specify the display area of the surface. Boundaries are created by selecting existing polylines or sketching new polylines.
- Add, modify, and delete the reference boundaries.
- Support for publishing partial surface data references.
- Support for exporting partial surface data references as LandXML.
- API for support for partial surface data reference workflows.

New in Dynamo for Civil 3D (What's New in 2026)

Nodes for catchments
- Dynamo for Civil 3D 2026 includes a group of new nodes for catchments, which can be used to boost efficiency for drainage analysis workflows. These nodes can be found under the new "Drainage" section of the Civil 3D node library. Catchment creation can be automated using the Catchment.ByPoints node, as well as other common actions like defining its flow path, time of concentration, and reference pipe network structure. In addition, the data for individual flow segments can be queried and modified using the nodes in the FlowPath and FlowSegment categories.
FeatureLine.ByPoints node
- A new FeatureLine.ByPoints node enables the creation of feature lines from a set of Dynamo points. You can use this node to automate a wide variety of workflows involving detailed grading.
Predictive Node Autocomplete for AutoCAD nodes
- Node Autocomplete results have been significantly improved for the nodes in the AutoCAD section of the library. Node Autocomplete is a feature in Dynamo that intelligently recommends which node you should use next. This machine learning-based prediction is continually trained using data from real-world Dynamo graphs, which means that the predictions will get better and better over time. Activate Node Autocomplete by double clicking any node port. Read more about Node Autocomplete on the Dynamo blog.
Nodes for section view labels
- Plan production workflows get another boost in this release with the introduction of new nodes for section view labels. You can use these nodes to automate the creation and modification of offset/elevation and depth labels within section views.
Labeling workflow sample graph
- A new sample graph called “Civil3D_CreateLotLabels” has been added to Civil 3D's library of sample graphs. The sample demonstrates how to automate the placement of spot elevation and general segment labels for all lots in a residential subdivision.
Mesh toolkit nodes
- Mesh toolkit nodes are now available by default in the Dynamo node library. Mesh toolkit provides tools to import meshes from external file formats, create a mesh from Dynamo geometry objects, and manually build meshes by their vertices and indices. Access them in the node library under Geometry Meshes Mesh.
Updated Dynamo Core
- Dynamo Core has been updated to version 3.4.1, bringing you the improved TuneUp extension for monitoring graph performance as a built-in extension, package version compatibility information in Package Manager, PythonNet3 engine as a package, and more. Read more about the major updates in the Dynamo blog.
Other minor improvements
- Any type of label can now be queried and modified using the nodes in the Label category.
- The Profile View Depth Label option is now included as an option in the Choose Object Type drop-down.
- The CogoPoint.SetStyle node now supports setting the style to <default>.
- Providing a null input to the Pipe.SetStructures node will disconnect a pipe from its start or end structures.

My Insights in Civil 3D (What's New in 2026)
Product usage insights are displayed on the Start tab. My Insights is information that is shown to you based on your usage of Civil 3D. The content is designed to be informative and actionable. See suggestions for commands and functionality that you might try along with other productivity insights.


Miscellaneous Enhancements (What's New in 2026)

Coordinate System Updates
- Coordinate systems added for AutoCAD, Map and Civil 3D.
. UK: rail and highway
. Malaysia: EPSG CS
. Saudi Arabia: SANSRS
. Serbia: VCS ETRF89.OSTN15_height
. Switzerland: vertical coordinate systems
Surface Performance Enhancements
- Rebuilding corridor performance improvement for corridors using a surface as a target.
- Surface analysis performance improvement.
- Performance improvement when cursor moves over a surface whose contours have large number of vertexes.
Customer Satisfaction Survey
- When you close Civil 3D, a customer satisfaction survey displays. The feedback collected from the survey is used to improve Civil 3D products.

API Enhancements (What's New in 2026)
Updates to the API have been made in the following feature areas:

Rail design
- Added API that gets the minimum distance between tracks of two alignments. Learn more.
. Alignment.TrackDistanceToAlignment(double startStationOnThisAlignment, double endStationOnThisAlignment, double? gaugeForThisAlignment, ObjectId otherAlignmentId, double? gaugeForOtherAlignment, TrackDistanceCalculationMode trackDistanceCalculationMode)
- Added API that gets the distance between tracks of two alignments. Learn more.
. Alignment.TrackDistanceToAlignment(double stationOnThisAlignment, double? gaugeForThisAlignment, ObjectId otherAlignmentId, double? gaugeForOtherAlignment, TrackDistanceCalculationMode trackDistanceCalculationMode).
- Added API that gets the distance between tracks of two alignments. Learn more.
. Alignment.TrackDistanceToAlignment(List<double> stationListOnThisAlignment, double? gaugeForThisAlignment, ObjectId otherAlignmentId, double? gaugeForOtherAlignment, TrackDistanceCalculationMode trackDistanceCalculationMode).
- Added API that gets the station set according to the station type, intervals, and station range.
. Alignment.GetStationSet(StationTypes stationType, double majorInterval, double minorInterval, double startStation, double endStation).
Surfaces
- Added API that gets origination type which indicates the surface is created from a Corridor or Grading.
. Surface.OriginationType()
Partial surface reference
- Updated API Surface.Operations(). InvalidOperationException will be thrown when it is a referenced surface.
- Added API property bool to query if a current entity is a partial reference object.
. Entity.IsPartialReferenceObject
- Added API that creates a partial reference surface with a specified boundary in the host drawing according to the host database, source drawing file name, surface name, and boundary object ID.
. DataShortcuts.CreatePartialReferenceSurface(Database hostDrawing, String sourceDrawingFilename, String surfaceName, ObjectId refBoundaryId).
- Added API that updates a partial reference surface in the host database after editing (adds, deletes, or changes) the reference boundary.
. DataShortcuts.UpdatePartialReferenceSurface(Database hostDrawing, ObjectId refSurfaceId)
- Added API that creates a partial reference surface with a specified boundary in the host drawing according to the host database, source drawing file name, surface name, and boundary object ID.
. DataShortcuts.DataShortcutManager.CreatePartialReferenceSurface(int index, Database hostDrawing, ObjectId dRefBoundaryId)
- Added API that provides access to the manager for partial reference boundaries.
. Surface.PartialReferenceBoundaryManager()
- Added API that retrieves all reference boundary object IDs.
. SurfacePartialReferenceBoundaryMgr.ReferenceBoundaryIds()
- Added API that adds a reference boundary to the partial reference surface.
. SurfacePartialReferenceBoundaryMgr.AddBoundary(ObjectId refBoundaryId)
- Added API that deletes a reference boundary from the partial reference surface.
. SurfacePartialReferenceBoundaryMgr.DeleteBoundary(ObjectId refBoundaryId)
Autodesk Construction Cloud
- Data Shortcut APIs are now available to Autodesk Construction Cloud workflows. This functionality requires access to Autodesk Collaboration for Civil 3D.

Assemblies and Subassemblies
- Fixed an issue in which solids from distant regions were incorrectly connected when extracting solids from a corridor.
- Fixed an issue in which the DaylightMultiIntercept subassembly did not work correctly with its intercept number setting.
- Fixed an issue in which the top width parameter of subassemblies was not recognized when the value was set to a decimal.
- Removed the parameter slope direction from the subassembly LinkSlopeAndVerticalDeflection as it did not serve a purpose.
- Fixed an issue in which the output parameters of subassemblies with the same name in one assembly could not be selected when the option Parameter Reference Use was selected.
- Fixed an issue in which the assembly name after copy-paste was not incremented properly.
COGO Points
- Fixed a stability issue when selecting multiple COGO Points from the Edit Points Panorama or the Table in Prospector while the Properties palette was displayed.
- Fixed a stability issue when selecting multiple Pipe Network parts from either the Panorama or the table in Prospector while the Properties palette was displayed.
- Fixed a stability issue when selecting multiple Pressure Network parts from either the Panorama or the table in Prospector while the Properties palette was displayed.
Coordinate Systems
- Fixed issues in which some elements of the Assign Coordinate System dialog box were not localized.
Corridors
- Fixed an issue in which feature lines extracted from a corridor moved after splitting the corridor region.
- Fixed an issue in which a layer for the solids extracted from one corridor changed to the current layer after adjusting its source DWG file.
- Fixed an issue in which hatches displayed inconsistently from the top view when different hatches were used on the top and bottom links at the same position.
- Fixed a stability issue when a drawing contained invalid hatches.
- Fixed an issue in which corridor links could not be selected if multiple section data was attached to sample lines when executing the command aeccreportcorridorslopestake.
- Fixed an issue in which a redundant subassembly displayed in the section view.
- Fixed an issue in which an alignment used as multiple corridor baselines caused the Corridor Points to report only points for the first baseline.
- Fixed an issue in which a warning message displayed multiple times for each corridor when running aeccreportcorridorslopestake.
- Improved error messaging while executing a Corridor Slope Stake report to provide correct information about the encountered issue.
- Fixed an issue in which solids could not be extracted from LinkMulti subassemblies.
- Fixed an issue in which a gap would occur when creating a region that started or ended at a station close to a geometry point.
- Added the ability to edit the Slope format and precision in the Corridor Lane Slope Report.
- Improved warning messaging reflect the actual product nomenclature when executing Corridor Slope Stake report.
Cross Sections
- Fixed an issue in which ExistingGround CrossSect changes appeared different after re-importing and re-exporting.
- Added the ability to Shift-select multiple sources on the Sample more sources tab of the Sample line dialog box.
- Fixed an issue in which materials could not be changed in the Change Volume Tables dialog box under the table list.
Data Shortcuts
- Improve the stability when setting data shortcut project.
Dynamo
- Fixed an issue in which certain surface types returned as objects instead of surfaces.
- Fixed an issue in which the Object.Color node would not return the correct color when the given object's color was set to ByLayer.
- Fixed an issue in which the CogoPoint.SetName node would display a warning message when setting the COGO point name to its current name.
- Fixed an issue in which the Get COGO Point Group node in automatic run mode returned results even though no inputs were provided.
- Fixed an issue in which the Layer.ByName node would not allow modifications to the current layer.
- Fixed an issue in which True/False property definitions created with the PropertySetDefinition.AddManualPropertyDefinition node caused Civil 3D to hang when accessed by the Style Manager dialog.
- Fixed an issue in which the PropertySetDefinition.AddManualPropertyDefinition node did not set the correct default value based on the property data type.
- Fixed an issue in which list definitions created using the PropertySetDefinition.AddManualPropertyDefinition node would not have the correct default value.
- Fixed an issue in which the PropertySetDefinition.AddAutomaticPropertyDefinition node would not correctly set the automatic property source.
- Fixed an issue in which the Viewport.TargetPoint node would incorrectly return the origin in certain cases.
- Fixed issues in which the Viewport.PaperToModelTransform and Viewport.ModelToPaperTransform nodes would return incorrect coordinate systems in certain cases.
- Fixed issues in which the Viewport.PointFromPaperToModel and Viewport.PointFromModelToPaper nodes would return incorrect points in certain cases.
ESRI GIS Data Integration
- Fixed an issue in which publishing data with CS CzechJTSK/5b.Krovak resulted in the wrong location reported in ArcMap Online.
- Fixed an issue in which importing an ArcGIS feature layer with an elliptic arc segment in the geometry as a 3D polyline or feature line failed.
- Fixed an issue that caused a login failure to the ArcGIS enterprise portal with Windows authentication.
Feature Lines
- Fixed an issue in which some corridor feature lines incorrectly generated when extracting all feature lines from a corridor. For corridors where this problem occurred must be rebuilt before extracting all feature lines or this problem will still exist.
Gravity Pipes
- Fixed an issue in which the Station Equation value was not shown correctly in a crossing pipe profile label.
- Fixed a stability issue that could occur with conflicting parameters in a customized pipe network catalog.
Intersections
- Fixed an issue in which Offset Alignment (Widening) was displaying an incorrect Left value for both Left and Right Widening.
Large Model Viewer (LMV)
- Added spiral type a sub-entity property in the LMV output.
Miscellaneous
- Fixed an issue in which negative radius values of the vertical curves of profiles could not be imported using the _AeccLandXMLIn command.
- Improved a performance issue that occurred when exporting a layout to a model with the EXPORTLAYOUT command.
- Fixed an issue in which the highlight preview when selecting an object was not working when using transparent commands.
- Fixed an issue in which the startup value of BGcorepublish would not save when closing and reopening Civil 3D.
- Fixed a stability issue that could occur when the drawing font directory path was changed.
- Fixed an issue in which a custom view could not be saved.
- Fixed an issue in which the annotative text style was set to an incorrect font style than expected from templates.
- Fixed a stability issue that could occur when running API QTOUtility.GenerateXMLReport().
- Fixed a stability issue that could occur when using the UNDO function after creating Grading under certain conditions.
Object Modeler
- Fixed an issue in which published surfaces would not sync correctly when drawing files contained proxy objects.
Parcels
- Fixed an in which a parcel was appropriately split but not properly displayed as a closed entity when moving an alignment to the same site.
Pressure Pipes
- Fixed an issue in which pressure fitting color was incorrect in Wireframe (Fast) view.
- Fixed a stability issue that could occur when calculating an unexpected pressure fitting boundary.
- Fixed an issue in which the List type property set could not be displayed in pressure fitting and appurtenance labels.
- Fixed an issue in which pressure pipe labels displayed incorrectly when the AECPSDAUTOATTACH command was run.
Profiles
- Fixed an issue in which the creation of an offset profile for an offset alignment was incorrect in certain situations.
- Fixed an issue where for some scenarios the grid lines in Profile View/Section View were drawn incorrectly or were missing from certain parts of the view.
Project Explorer
- Fixed a stability issue that occurred when a structure or pipe that did not reference a valid part in the parts catalog displayed in the Project Explorer window.
- Fixed a stability issue that occurred when a pipe network was selected in the Project Explorer window and did not reference a valid Parts List.
Rail Design
- Fixed an issue in which Applied Cant was not recalculating when the Start Station parameter was changed for a manual station.
- Fixed and issue in which a 0 Cant value at the spiral of a C-S-S-C curve group occurred when two curves have opposite clockwise orientations.
- Fixed an issue in which AUDIT commands incorrectly displayed an AeccDbRootSettingsNode(8C) error.
Reference Templates
- Fixed an issue in which the override status of label components from a referenced template was not correct when reopening that drawing.
- Fixed a stability issue that could occur when editing an assembly style or intersection style imported from a reference template.
Subassembly Composer
- Fixed an issue in which elements from a tool box could not be dragged into a sequence workflow in subassembly composer.
- Improved performance when opening or importing large PKT files.
Superelevation
- Fixed an issue in which certain curve groups did not correctly import when an alignment was not imported from XML.
Surfaces
- Fixed an issue in which surface points displayed or plotted when its style layer was turned off or frozen.
- Fixed an issue in which the surface contour color changed when zooming in and out in Conceptual visual style with LOD mode enabled.
- Fixed an issue in which a coordinate system could not be exported to DEM and impacted performance when exporting large surfaces with grid spacing 1.0.
Improved the performance of repeatedly exporting to DEM.
- Fixed an issue in which surfaces created by Data Clip boundary are different if only the elevation of the clip boundary is different.
- Fixed an issues in which TIFs created from Civil 3D could not be loaded to 3rd party applications.
- Fixed an issue in which multiple swap edge selection messages appeared when swap edge did not succeeded.
- Fixed an issue in which the first point did not highlight correctly in wireframe (fast) mode when selecting multiple surface points.
- Fixed an issue in which deleting a surface breakline in Prospector would not display that it was out of date.
- Fixed an issue in which a surface could not be created from GIS without an area of interest.
- Fixed an issue in which extra create snapshot listing under definitions after linking/promoting a surface.
- Fixed an issue in which surfaces from GIS Data were not created in Civil 3D using crossing selection.
- Fixed an issue in which viewing a draped image appeared flipped in the Object Viewer with hardware acceleration enabled.
- Fixed an issue in which surface boundary creation was generated differently from the intended source object.

CIV3D_2026_English_Win_64bit_db_Install
Autodesk_Civil_3D_2026_Object_Enabler.exe
Autodesk_DrainageAnalysis_Tech_Preview_for_Civil_3D_2026.exe
Grading_Optimization_2026.exe

Offline_Help_for_Civil_3D_2026_Brazilian_Portuguese.exe
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