Forums >> Revit Building >> Technical Support >> Unable to PICK lines from linked file

Rams

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Joined: Fri, Mar 28, 2008
128 Posts

Version - Revit 2014

We have linked all cad files into REVIT file. Then this Revit file is linked into main model to avoid CAD related issues, however we are unable to trace wall using PICK option as nothing gets selected

Please advise if there is any solution

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Now on the implementation stage....

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

I think this is a poor process.  I tell everyone to never trace CAD because it is inaccurate by Revit standards.  CAD is very accurate point to point within CAD tolerances.  But Revit uses a different method that somehow keeps parallel items parallel.  Revit will only dimension parallel items. 

For your needs, I recommend you link the CAD then using the CAD background create your Revit walls over the CAD snapping to points but allowing Revit to keep parallel items parallel.  Remember that for obtuse areas, you can rotate your view to work ortographically in the obtuse areas.  This process is so easy in Revit..... 

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Rams

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Joined: Fri, Mar 28, 2008
128 Posts

WWHub - Go throught the link below:

http://revit.blogspot.in/2012/03/dangers-of-importing-cad-into-revit.html

I thinks its ver poor process to attach CAD directly to Revit, however your opinion is different

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Now on the implementation stage....

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

Rams,

I really don't have to read that because I have been preaching "don't import CAD" for many years.  But you can link and you can import if you know what you are doing. 

This is what I wrote for our office a long time ago:

IMPORTING CAD DETAILS

July 24, 2009

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 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 CAD 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 CAD.  Find that linestyle (assuming A-DTL-Heavy) and delete that sub-category.
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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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

I would amend this today replacing 5 t0 11 with the following"

1. Window the view and filter for one of the CAD linestyle. (example A-DTL-Heavy)
2. Change that linestyle to your Revit Heavy linestyle.
3. Repeat until all lines are converted.

There is no need to delete the CAD linestyles as this is a junk (cleanup) project and you will be discarding it.

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