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how to create a swept path along an ellipse from a fancy profile ;)

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    how to create a swept path along an ellipse from a fancy profile ;)

    Okay I'm having issues trying to create an archway which has an ellipticle form. This archway is part of a listed building so what I'm producing is from 3D scan data and needs to be exact to the forms i've shown. (See attached)

    Originally I had modelled the whole archway in AutoCAD with no problems, however when i tried to import the archway into revit the top of the arch only came in as lines as it wanted me to polymesh the arch in autocad (polymesh just looked shocking) so I was forced to try and model it in REVIT. I imported the profile and path from AutoCAD so that i could pick lines in REVIT however, revit again didn't like CADs ellipticle arch, so i drew lines to capture the ends and centre of the ellipticle arch so that i could draw the ellipse from scratch in Revit which i've now done. however a couple of problems occur:

    1. I can't move the arc to the lines (which i created model lines from) even after turning off constrain
    2. The profile won't extrude along the path as it claims to have more than one loop!!! I have been very careful when picking my lines and have not created multiple loops, i have even tried making an extrusion of the profile in cad to check it (which is now in the family) surely if i'm selecting the edges of a 3d object, how can i be creating multiple loops. is REVIT lying to me lol

    Please help me, Revit has made me feel slightly suicidal today with it's single path methodology. in AutoCAD theres 100 ways of doing things, in Revit there seem to be 100 things that can go wrong and only 1 possible sollution that needs to be done exact or fail!!! please someone convince me otherwise.
    Attached Files
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    #2
    I have a feeling you're not taking advantage of the set workplane(SW) command and the tab key on your keyboard to select multiple lines. I had no problem making the sweep you're looking to make.

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      #3
      pieces of your profile have multiple segments on top of each other, thus the "multiple loops" error. You can zoom in and crossing-select a line segment in the profile, and then look to the bottom right corner of the revit window at the "filter" icon (looks like a funnel) and Revit will report how many objects are selected. when I select the entire profile, it reports 49 objects. It looks like nearly every segment is duplicated at least once.

      You can also create a 2D profile family, by itself, and then load it into this family to create the sweep. You will see when creating the sweep, you can either use a loaded profile or sketch your own. Might be easier to see what is going on.
      Last edited by Scott D Davis; July 13, 2011, 05:06 PM.
      Scott D Davis
      Sr. AEC Technical Specialist
      Autodesk, Inc.
      http://bit.ly/aboutsdd

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        #4
        I was using the tab to select multiple lines, but it wasn't working for some reason??? I didn't however use SW which workplane should i be working in for a 3D swept path?

        I was getting the multiple loop thing when picking one line at a time, so how would be picking multiple?
        please visit my architectural site

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          #5
          Originally posted by Jimidy View Post
          I didn't however use SW which workplane should i be working in for a 3D swept path?
          Just make sure the workplane lines up with what you're drawing. The path would be in the same plane as the door. The profile would be in the plane of the cross that pops up, perpendicular to the path. You want to make sure if you are picking the lines, the lines you're picking need to be in the same plane as well. I'd try scott's suggestion first though. That's the recommended method, especially if you use the same profile more than once.

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            #6
            Originally posted by Scott D Davis View Post
            pieces of your profile have multiple segments on top of each other, thus the "multiple loops" error. You can zoom in and crossing-select a line segment in the profile, and then look to the bottom right corner of the revit window at the "filter" icon (looks like a funnel) and Revit will report how many objects are selected. when I select the entire profile, it reports 49 objects. It looks like nearly every segment is duplicated at least once.

            You can also create a 2D profile family, by itself, and then load it into this family to create the sweep. You will see when creating the sweep, you can either use a loaded profile or sketch your own. Might be easier to see what is going on.
            Yes I've worked out that you can load multiple things into one family which is very useful. regarding the multiple objects thing is there a command in revit similar to the overkill command in Autocad which removes any duplicate objects?

            Also I'm working on original survey data in AutoCAD, is there a way of copying linework directly into REVIT rather than having to create a new file for every single profile i produce, I would love to bring the survey data directly into REVIT but it never seems to work as it should do (or as i would expect)
            Last edited by Jimidy; July 14, 2011, 11:33 AM.
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              #7
              First off: regarding our other discussion, your statement here (about having to create a new profile for every single thing you want to convert): that's exactly my point and also the reason why this is NOT faster...

              Further more: do you mean survey data as in a terrain model?
              There is no way to bring autocad lines directly into Revit.
              Martijn de Riet
              Professional Revit Consultant | Revit API Developer
              MdR Advies
              Planta1 Revit Online Consulting

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                #8
                No the survey data was originally a pointcloud that was stitched together in Cyclone and cloudworks, somebody then produced a set of internal elevations and sections using the raw point cloud data, so basically i have the Autocad elevations and sections to work from, I also have access to the pointcloud data which is only viewable in autocad 2005 as the cloudworks license they have doesn't allow it it to be used in later versions lol, hence why the initial modelling is much easier in AutoCAD.

                The other annoying thing is that my clients have said hey want a revit 2011 model so the point cloud usage of 2012 can't help me either. Ideal situation would be for everyone involved to upgrade all their licenses of every piece of software required, problem is Autodesk have pretty much monopolised the market so that would cost an absolute fortune to do.
                please visit my architectural site

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