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Imported CAD bloc & scale

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    #1

    Imported CAD bloc & scale

    hi,
    I post here 'cause I use RST, but could be the same with RAC.

    I wonder about something: when creating a detail component family or generic annotation, I often re-use old CAD dwg (we have many). In type properties, I figured that the scale factor of the import could be driven by a parameter. useful to adjust the size I thought...
    I tried to make it work in the project, but it don't.....

    Ideas and tips? thanks

    ps: I've read a long time ago a post about scales in family, depending in fact of the template of the family
    Julien
    "Au royaume des aveugles, les borgnes sont mal vus!"
    P. DAC
    Follow me on Twitter @Jbenoit44 - Blog: http://aecuandme.wordpress.com/
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    #2
    I think what many would just say upfront is to not use your old CAD dwgs as your new Revit Drafting views...DWGs in Revit really bog it down and can leave traces all over that are hard to removed later. It is recommended to create your old details using detail components and/or using detail lines in drafting views....

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      #3
      yep, I agree with you, BUT the fact is that we have decades of cad stuff, and they will go one day all to the trash can, but I have to make compromises....like many of us do I guess.
      Julien
      "Au royaume des aveugles, les borgnes sont mal vus!"
      P. DAC
      Follow me on Twitter @Jbenoit44 - Blog: http://aecuandme.wordpress.com/

      Comment

        #4
        I would suggest just using them as an image or inserting the cad link that way should the cad file change your detail will also update accordingly rather than having to edit it on a per project basis. Also I agree with gdoherty, copy/pasting in cad linework is a nightmare and will cause alot of problems. If you have an office junior, having them re-draft all your standards into revit is a great tutorial for them and gets your standards re-detailed at the same time. It teaches them how to quickly draw 2d fillout details, and its essentially just a copy drafting exercise, and keeps them productively occupied for a long time... having said that, I re-drew all of our company standards myself into revit it only took a few days but was worth the effort.

        Comment

          #5
          Going back to the original topic: that is very weird, and I had not noticed this before. A CAD object that is nested into another family such as a Detail component, contains a type parameter named "Scale factor", as Julien described it above, and this parameter can be tied to a parameter in the host family. The CAD object responds to changes in the value of the scale parameter, but only in the family editor. Once the detail component is loaded into a project, the parameter stops to work. Very weird. Makes you wonder why that parameter is there if it is not going to work in the project.
          Freelance BIM Provider at Autodesk Services Marketplace | Linkedin

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            #6
            I guess it's there because a lot of cad drawings are created in scale. So the 10mm line length in the dwg is 100mm in real world. Instead of measuring and resizing one could use this scale factor to set it straight in the FE. No need to use it in the project.

            Can a scale factor be added: I think it can. But with Revit parameters. Would have to try it out but does this work:
            1. Create Integer Parameter for the scale factor.
            2. Dimension the dwg and add a parameter length_calculated
            3. Add a parameter length and add a formula to length_calculated stating: length_calculated = length*scale_factor.

            Does this work for a dwg?
            Martijn de Riet
            Professional Revit Consultant | Revit API Developer
            MdR Advies
            Planta1 Revit Online Consulting

            Comment

              #7
              Originally posted by mdradvies View Post
              Does this work for a dwg?
              No, it does not. A dwg will not respond to a Revit parameter in that way. Revit will issue an error such as "Constraints are not satisfied". The strange thing is that the dwg import can be scaled up and down in the family editor with a parameter, but not in a project.
              Freelance BIM Provider at Autodesk Services Marketplace | Linkedin

              Comment

                #8
                Too bad... Another reason not to be using dwg's...
                Martijn de Riet
                Professional Revit Consultant | Revit API Developer
                MdR Advies
                Planta1 Revit Online Consulting

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