Forums >> Revit Systems >> Technical Support >> converting dwg detail

vinnygolfer

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Joined: Wed, Jul 8, 2009
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WWHub

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Joined: Tue, May 16, 2006
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Here is what I recommend - no tracing involved -  ALWAYS DO THIS IN A JUNK PROJECT FILE

For CAD files you want to import into a drafting detail to clean up, you should do some prep work in CAD.  But even before that, start a new REVIT project to use for your CAD cleaup that has your text and dimension styles as well as linetypes.  The following assumes you have only three line styles in your REVIT file... Light - Medium - Heavy so adjust this process as appropriate.

In CAD

1. Flaten 3D
2. Explode all blocks and xref's
3. Delete all hatches, polylines dimensions and leaders.
4. WBlock to a new file only what you want.

In Revit

1. Create a drafting detail of correct scale
2. Import your CAD detail from the new file
3. Explode the CAD file (THIS IS A VERY BAD THING TO DO IN YOUR PROJECT FILE - THAT IS WHY WE DO IT IN A TEMPORARY FILE)
4. Now - CAD lines are now new Revit linestyles named according to their layers.
5. GOTO VG and turn off everything then turn back on the main line category and thin lines.
6. Nothing should be visible.
7. Goto Settings/Line styles - expand the lines category and repeat the following:
8. Start with your heaviest line style in the CAD file.  Find that linestyle (assuming A-DTL-Heavy) and delete that sub-category from your linestyles.
9. All those lines will now be Thin Lines and will be visible
10. Select them all from your detail window and change them to your Revit Heavy Lines and they will disappear.
11. Repeat 8 - 10 above until you have converted all and your finished with thin lines.
12. Convert all your text and clean that up.
13. Add leaders to text notes
14. Add dimensions
15. Add filled regions.
16. Click on File/Save to Library/Save Views and Pick your Details that you have cleaned up to save into your library.
17. You can also transfer these views directly into your project.

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vinnygolfer

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Joined: Wed, Jul 8, 2009
181 Posts

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Try to learn at least one new thing every day

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

I wrote this a year or two ago.  Looking at it now, I would revise it.

Since we are cleaning up in a junk file, no need to delete the linetyps.  Justcross the wholeview then filter for a specific CAD linetype like A-DETL-HEAVY then change those toRevit HEAVY lines ... repeat the process until you have no CAD linetypes left.

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vinnygolfer

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Joined: Wed, Jul 8, 2009
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by the way, i tried this out and it worked great. thank you

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stealthnyc

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Joined: Thu, Sep 13, 2007
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I'm a little late to the party here but something that I found useful was to use Laytrans in CAD to covert your exg layers

to the linestyles you want in Revit.  Then when you do the explode you won't have to switch them over. 

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