By Garry Stockton
Converting AutoCAD Detail to Revit
Did you know you can draw high quality details in Revit, if standards are developed and utilised appropriately? However, every company must decide on how they handle details and whether they recreate them in Revit or import them from AutoCAD.
Details are a vital part of the documentation process for building design and construction projects. CAD users who have used AutoCAD for years have typically developed a large detail library, or at least possess many details used on previous AutoCAD projects. Those details are valuable as a lot of time and knowledge has gone into developing them. It is important to be able to access those details for use within Revit.
While there are various methods utilised for re-using AutoCAD details, not all of them are good solutions and some can add corruption to your Revit project file and create problems.
The best long-term solution for re-using AutoCAD details is to migrate the details into Revit native entities. While inserting and then exploding details is a common practice, it creates residual information in the file and requires time and effort to clean up.
To migrate AutoCAD details to Revit is basically a quick 3-step process:
Link the AutoCAD detail into Revit.
1 - Firstly, Link the AutoCAD Detail into Revit.
2 - Then Trace the AutoCAD linework with Revit tools to create native Revit elements.
3 - Remove the linked AutoCAD detail
Link the AutoCAD detail into Revit
Create a new Drafting View from the View tab and the Create panel. Name the view specific to the detail that you will create. Set the appropriate scale for the detail.
On the Insert tab, select the Link CAD function from the Link panel. Select the desired AutoCAD detail and select positioning to be “Auto – Center to Center”.
Trace the AutoCAD Detail with Native Revit Entities
You do not actually need to trace the lines of the linked file, as that can make the process take longer. Instead, go to the Annotate tab and start the Detail Line command from the Detail panel. Select one of the Line Styles and then select the Pick Lines option on the Draw panel.
Details - Pick Lines
Proceed to select all the lines that will use that particular line style. Next, select another line style and proceed to select all the lines that use that particular line style. Repeat for each of the desired line styles.
This process is much faster than tracing linework.
The AutoCAD link can be temporarily unloaded to see the Revit linework and verify that desired linework has been replicated.
Instead of using some of the linework, it can be better to use Detail Components where applicable, especially for items like angles, beams and other entities.
After getting the linework recreated, proceed to add the appropriate Revit fill patterns to the detail.
AutoCAD hatch patterns do not come through as Revit fill patterns, so any of those would need to be recreated as Revit fill patterns anyway if the detail were inserted and exploded.
This will create consistency throughout your projects by using your standard Revit fill patterns.
Add text as appropriate to the detail using your company standard Revit text types.
If the AutoCAD detail was exploded, the text would not be the same text types as used in the rest of the Revit project. Inserting the AutoCAD drawing adds the AutoCAD text styles as additional text types in the Revit project.
Add dimensions as appropriate to the detail.
If the AutoCAD detail was exploded, the dimensions would need to be recreated in Revit due to the AutoCAD dimension being lines and not true dimensions.
Remove Linked AutoCAD Drawing File
Go to the Insert tab and select the Manage Links function from the Link panel.
In the Manage Links dialog box, go to the CAD Formats tab and highlight the appropriate AutoCAD file name. Pick the Remove button at the bottom of the dialog box.
The AutoCAD file is no longer associated with this Revit project.
This process creates a detail that now utilises all native Revit entities and does not leave any AutoCAD entities in the Revit project file. This detail can now be used in any other project file and/or saved out to a detail library.
- To save the detail out to a library as an individual Revit detail file, highlight the drafting view detail name in the Project Browser, right-click and select “Save to New File” from the context-sensitive menu. Save the view as a file in the desired location.
- The detail can also be copied into another project file by opening the other project and in that file go to the Insert tab. Select the Insert from File button and the “Insert Views from File” This allows you to insert a view from any other project file, so the desired detail drafting view can be selected for import.