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converting ACAD details for Revit use

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    converting ACAD details for Revit use

    I've started the daunting task of converting our standard CAD details for use in Revit. I've established line weight settings (that may be adjusted as I progress,) set the Import Line Weights txt file for line weight conversion, and imported the CAD file. There are the expected issues with hidden lines, hatches, etc. But otherwise, looks great. But when I partial explode / explode the imported file, I lose all the line weight conversion and some of the lines revert to CAD colors. My support person assures me that this does not happen, and yet, there it is on my screen. No line weight, and colored lines. What am I doing wrong, folks?

    #2
    Regardless of the funny behavior that is not supposed to happen the proper workflow for converting your CAD details is to start a new blank file that you will import the CAD details into drafting views of. Once imported do not explode the CAD linework but start drafting Revit linework over top of the CAD linework. Then once a detail is completed delete the CAD import from that view. Continue to do this until all CAD details are in a single file. Then start a new blank file and import the drafting views into it. This will remove all of the imported CAD line styles and reduce file size quite a bit. After this is completed you have a Revit project file for your standard details that users can import views from for use in new projects as needed. Non-standard schedules that are not wanted in the template file can be put into this file as well for use in projects as needed as well.

    When a new standard detail is needed you will repeat the process of starting a new blank file, redrawing with Revit linework and then importing that view into your standard details project file. Once again, this whole mess of a workflow is to prevent CAD line styles from ending up in your project files and to keep the details project file as light as possible as CAD linework tends to be very heavy for some reason and causes serious project bloat.

    If you have an example project of a detail that explodes to revert to CAD line styles you can upload a new project file with just the detail imported for us to look at and troubleshoot why that is happening though.

    Comment


      #3
      As hypnox stated, "NEVER EXPLODE ACAD DRAWINGS IN REVIT". If you do not have the time to re-draw with Revit, then:
      1. Do all of your changes in cad prior to import to Revit.
      2. Delete all items from paper space and all un-used linework from model space. (I use 'erase all' and de-select linework to stay.)
      3. Explode any blocks and revise all linework to, color by layer and linework by layer.
      4. Purge and Save.
      5. Import to Revit

      Patrick

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        #4
        If you are starting to re-create your details in Revit i would recomend looking into Detail Compoments. To use them will take upfront time and resources but in the long run it would be the most wise choice for detailing.
        -Alex Cunningham

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          #5
          Thanks! Wow, I suspected that there was a better way to do this that would require a lot more work. We have an enormous library of details that need to be converted. Redrawing them all seems a colossal undertaking at the moment. However, I'm grateful for the "correct" way to do this.

          I was not importing the CAD file into a new project (naughty.) So once I did that, exploding the imported file maintained the line weights. BUT, I won't be exploding CAD files going forward.

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            #6
            As stated before: do not explode. This will give you enormous filesizes (at least compared to the non-exploded ones) and tons of problems in correcting linewheights, etc.

            As stated, the only correct way is to create new Revit details.
            That being said: please remember that Revit Detail Components can also be nested. If you, for instance, have a detail library of windows in different kind of walls, create the window DC's first. Then import these in the general details with walls. To put in different words: break down your library into parts and start by creating them first. You'll see that once you have the bases covered, creating the more complex details will go a lot faster.
            Martijn de Riet
            Professional Revit Consultant | Revit API Developer
            MdR Advies
            Planta1 Revit Online Consulting

            Comment


              #7
              Maybe this is an alternative work-flow to consider:

              1. Open a new blank Revit project (if it already has all your standard detail Line Styles and Filled Regions, all the better - if not, set up at least the basic ones).

              2. Open a new Drafting View. Set the scale to the largest scale of detail you're going to be working on for that batch, e.g. if you have both 3" and 1 1/2", set the scale to 3". It might be easier to only do batches at the same scale. If you do batches at different scales, make sure to keep them organized by scale in your Drafting View.

              3. Insert into that Drafting View as many AutoCAD details as you want (or your computer can handle). It can be dozens, though maybe start off with just a couple the first time around until you get the hang of it.

              4. Do a Full Explode on all the details.

              5. Select all the exploded details, use the Filter tool (the funnel icon), and deselect everything, and then select one Line Style. Click OK. Change the Line Style type to one that you want instead.

              6. Do this for all the lines in your project.

              7. Do similar for your Filled Regions. You'll probably have to delete the original ACAD ones. I suggest creating a bunch of generic box Filled Regions (each a different Filled Region Pattern), and then just copy those around, edit the Filled Region "sketch" for the detail.

              8. Do similar for Text Styles (chances are you're going to have to do a lot of text cleaning: deleting leaders, combining separate text lines into a Revit text style note, etc.).

              9. If you did details of different scales at the same time, create a new Drafting View set to the appropriate scale, and cut & paste the details of that scale into the new view (you actually might want to do this step sort of concurrent to the previous step since the scale will affect the text size).

              10. Depending on the time budget, this would be a great time to fix up some of the details with Detail Components.

              11. When all the details are cleaned up (you should be able to select all of them at once, select the Filter tool, and only see your Revit standard Line Styles, etc.), only then copy and paste them into their own individual Drafting Views in your project.

              If they're going to be part of a detail reference library, consider placing them in a project file specifically for that purpose. You can even have a separate project file for different types of details. It's easy to copy multiple drafting views from one project to another.

              The more details you do at once, the faster it goes (but don't go overboard at first, and make sure to Save often!).

              Hope that helps.
              Last edited by iru69; January 18, 2011, 03:43 AM. Reason: expanded steps

              Comment


                #8
                Originally posted by iru69 View Post
                Maybe this is an alternative work-flow to consider:
                shouldn't this be made a sticky note or a part of a FAQ? Great info :thumbsup:
                I'm retired, if you don't like it, go around!

                Comment


                  #9
                  Originally posted by Dave Jones View Post
                  shouldn't this be made a sticky note or a part of a FAQ? Great info :thumbsup:
                  Thanks. I'd like to expand on a few things... maybe I'll just write it up as a "tutorial".

                  I'm sure you remember a similar thread on AUGI about this... I hope the detailing is working out for you a little better now.

                  Comment


                    #10
                    Originally posted by iru69 View Post
                    Thanks. I'd like to expand on a few things... maybe I'll just write it up as a "tutorial".

                    I'm sure you remember a similar thread on AUGI about this... I hope the detailing is working out for you a little better now.
                    Yes, I do remember that thread. I'm still linking CAD details and putting them in drafting views but my NY resolution was to get started at creating Revit content this year. I copy/pasted your post and it's tacked to the wall in front of me. No ignoring the situation now
                    I'm retired, if you don't like it, go around!

                    Comment

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