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Thread: Cad drawings to revit line drawings

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    Cad drawings to revit line drawings

    How would I import a CAD drawing and convert it to a line drawing in revit? I want to import the CAD drawing and take call outs from it. When I import the drawing into a drafting view, and then take a call out of the a specific section, nothing shows up in the call out. Is this even possible to do in Revit?

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    I have already tried to explode the CAD file, but there are too many "instances" to explode.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    If youve been exploding CAD DWG's in your Revit model, that model is going to be completely screwed later. What is it a drawing of?

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    Senior Member ahmed_hassan's Avatar
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    there is better idea, possibly you have a little lines and although that the programme tell you when you explode it there is too many lines so the solution for this is inside cad itself
    - just select the drawing intending for importing it in revit and make ctrl+c
    - paste it in new empty cad file.
    - then import it in another empty revit file (not within your revit project because if you did that you will definitly will slow your performance).
    -after you imported it into another empty revit file explode it convert it into revit lines , get rid of cad lines if it is possible and noting that. if your lines is more than 10,000 lines revit will not explode,however if you have possibilty not to explode it and you need just few lines ,it is better to use pick lines and then tab .
    that what i am usually do and ask other members i complained a lot in this inside forum. but memebrs here have good advices.
    Last edited by ahmed_hassan; November 20th, 2011 at 09:56 AM.

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    I usually convert dwg details to revit detail falmilies, like window details, curtain wall details, and i do it like ahmed said. Its not a good idea to import it directly your model, it will create a lot of linestyles btw...

    And what about this "line is too short" problem? Will it be solved, or it remains revit's defect?

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    Junior Member engel_hg's Avatar
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    Hi guy's. well regarding on this matter. importing detail to Revit. we need to considered the following.

    1. first is the scale and unit or your cad file.
    2. Layer
    3. you most isolate only the detail that you need to export.
    4. hatch pattern

    Now workflow and template, in my practice first thing is to do is to wblock the detail that i need or if the detail is already separeted much better you just need to check the Layer and purge it and save, also i suggest to run the command "overkill" to delete the overlapping lines in autocad.

    then when you done all that in Cad go to revit. open new project from "view" create new "drafting view" after that insert the cad detail go to insert tab then import cad. double check the following on the insert dialog box

    - Color:Preserve or Black and white
    - Layers: Visible
    - Import Units: (units of your autocad)

    then once imported Verify dimension if correct before exploding. if correct hit the "full explode" after exploding some line that are below 0.8 in mm will be deleted. check now all the line if correct,you most purge it to have a clean detail.

    now just save your Detail go to "menu"/save as/library/view select the name of the detail you want to save in your library

    for me i compile all my detail in one single revit file see image below.

    Cad drawings to revit line drawings-detail..jpg
    Last edited by engel_hg; November 20th, 2011 at 04:08 PM.
    lucis29 likes this.

  7. #7
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    Quote Originally Posted by Nathaniel101789 View Post
    How would I import a CAD drawing and convert it to a line drawing in revit? I want to import the CAD drawing and take call outs from it. When I import the drawing into a drafting view, and then take a call out of the a specific section, nothing shows up in the call out. Is this even possible to do in Revit?
    DO NOT EVER EXPLODE DWG'S IN REVIT. It will totally f**k up your project.

    Here's a workflow to create callouts from a dwg:
    1. Import / Link cad file in a MODEL view. Keep in mind that you need to uncheck "Visible in this view only" from the import menu.
    2. Create Callouts and you should be fine.

    The one suggested by engel_hg is better, since it leaves all redundant crap out. However, for correct placement in Revit I suggest you move the Autocad UCS to the intended wblock basepoint before creating / exporting the wblock. This will not affect the placement in drafting views but will affect placement in model views...


    But in all fairness: just don't do it.
    Use them as underlay to create native revit detail components. Preferably parametric but not necessary. Upside is you can always do that later. Compile native revit detail components which you can place in model views. Done correctly you can adjust any standard detail to project environment in a few clicks. You'll gain all the time needed to manually coordinate and update those pesky line thingies.

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