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Wall is off axis...for existing building

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    #1

    Wall is off axis...for existing building

    Hi, I have a set of AutoCAD Surveyor Drawings and I am supposed to model the existing building based on that. However, there are many places where when I tried to align the wall, (even not tracing the lines, just trying to match closely), Revit will give me these warning" Warning: Element is slightly off axis and may cause inaccuracies."
    The length of the wall is about 18meters and if I correct the wall in revit, start from one corner, draw to the next corner, in order for revit not to produce any more warning, the wall at the 2nd corner is about 50mm apart.
    What should I do? on one hand I want to match the surveyor's dwg, on the other hand I don't want my revit model full of warnings before it even kick off with the new design...
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    Tags: off axis warnings
    #2
    I've also tested it by importing the CAD plan and checking that box to ask Revit to correct lines that are off-axis. When I traced that line from this Cad dwg, it also gave me the same warning...

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      #3
      Pretty sure that if you want it to be correct you are going to have to live with the errors.
      If every wall generates the same error, maybe you can rotate the CAD file a bit so the error goes away, but check first if that does not give you more errors then it solves of course.
      Company Website: www.deurloobm.nl
      Revit Ideas: Is this family Mirrored? | Approve warnings | Family Type parameter just those in the family

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        #4
        Yes as Robin says you may have to live with the errors. As far as i know theres no way to turn them off.
        There are no stupid questions, only stupid people

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          #5
          Thanks for the replies.

          Comment

            #6
            If you're basing it on tracing a CAD file it may not be the actual wall condition at all. It may just be how Revit has translated the DWG into its own format to present it to you. Different software resolves the math required for drawing differently...yes even though Revit and AutoCAD are both Autodesk products.

            Also, if this is a property boundary and describes the legal existence of your client's project site then you need to represent that as it "is".

            In many cases fixing a wall or sketch segment that is reporting a warning for being off axis isn't going to do any real harm. Most of the time this warning is describing a dimensional value that may not be detectable/measured by anyone in the field. As such fixing 1/100 of degree is probably harmless.

            If we can determine how serious the reality of the situation the warning represents we can make reasonable decisions about it.

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              #7
              I've seen similar things pop up when people have scans of existing buildings and the walls end up a little off - think of a building like a hotel where the room module is fixed across the building at a value (13'-0" is common) but the walls when scanned come in at 12'-11.25" at one end and 13'-0.25" on the other end (i.e. the wall isn't square.) At that point you can model the actual condition as it exists, which may be necessary for historic preservation issues or equipment clearances, or you can model the intent, which is a 13'-0" module at 90 degrees. Which one you choose goes back to the earlier posts - in particular what Steve said:
              If we can determine how serious the reality of the situation the warning represents we can make reasonable decisions about it.
              Revit for newbies - A starting point for RFO

              chad
              BEER: Better, Efficient, Elegant, Repeatable.

              Comment

                #8
                You will get that warning everytime you draw something thats on a weird degrees, like 45,35. Just ignore it and draw the way you need to.
                If you get a pointcloud of an existing old building, you will get those warning with almost every wall and beam.
                www.jansenengineering.nl

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                  #9
                  Yeah, thats entirely not true. And its bad advice, in my opinion. If you are just blissfully clicking on what the point cloud gives you, you MIGHT get a whole bunch of those. Then again, you might get an entire model thats useless, too.
                  Aaron "selfish AND petulant" Maller |P A R A L L A X T E A M | Practice Technology Implementation
                  @Web | @Twitter | @LinkedIn | @Email

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                    #10
                    Why would it be useless, it's just very accurate, that revit wants straight and square spaces doesn't mean an old building has those.
                    Can you explain why it would be useless, so maybe next time i just model like revit wants and don't bother those little differences. It would save me a lot of time.

                    Like in the TS it's 50mm, imo that's a lot of difference for modelling an existing building.

                    I did a big project where we needed to model a lot of existing buildings everything under 5 mm was ok, but above that we modelled it with the error. The only thing we didn't model was, if a wall was slightly titled, that was too much work to do for the project. These models were also used for analytical analysis in SCIA.
                    Last edited by Marcel Jansen; September 23, 2018, 06:52 AM.
                    www.jansenengineering.nl

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