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Swept Blend on Double Curve

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    #1

    Swept Blend on Double Curve

    Same problem I had with RAC2011. I have modelled a double-curved object whose edge I want to pick to make a double-curved swept blend. When I do it, the pick only chooses half the curved object. So I thought "ok, I'll mirror the picked line." But it won't take. So I thought "ok, I'll make the swept blend and then mirror it." But it makes two back-to-back swept blends that I cannot join...

    I had a similar problem last year and someone suggested I model this as a mass?
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    #2
    I don't know what type of object this is, but it might be possible, in one piece, with a ceiling or floor with a slope arrow:
    Attached Files
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      #3
      The end result is supposed to be a top rail of an iron fence that is crowned in elevation and curved in plan view.

      There are two objects. One is the "setup" object, which I probably should have put in "Hide" mode. It is an in-place solid extrusion, about 3' high x 1.5" wide, curved, which I then went into Section 2 and used a cut-void to make it curve in a second direction. I see that I didn't really need to cut out the bottom of the object, just the top, because its entire purpose was to provide a double-curved top which I would "pick" when making the Swept Blend.

      The 2-piece Swept Blend IS the second piece. The only reason it is 2-piece is because it seems I NEED to use 2-pieces to create the object.

      The attached may make this clearer (I put the "set-up" item in Hide mode, and added the fence section that is missing the piece I am trying to create). (Note: I tried this as a Sweep as well).
      Attached Files
      Last edited by narlee; June 4, 2011, 12:10 PM.

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        #4
        Well, you have, at least, these two choices:

        1) A model in place using Swept Blend. Choose a category. Using the top of the wall as the path, you could make one half of the object, since only one curve is allowed. Finish it, mirror it. Then, erase the seams between the two parts using invisible lines.

        2) A ceiling or floor entity in one piece, as shown above.

        Option 1 gives you the freedom to sketch the profiles.
        Freelance BIM Provider at Autodesk Services Marketplace | Linkedin

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          #5
          Thanks Alfredo. That's a quick method, indeed. Although it doesn't keep the rectangular profile "horizontal" if you will, as it passes through the curve. I did find that prior thread where Cliff Collins suggested using a mass, which I will also try:

          Swept Blend Challenge
          http://forums.augi.com/showthread.php?t=124102&highlight=swept+blend
          I have a support request in on this, but: The attached model is a cap on a wall. The wall is two objects, one of which is modelled from three arc segments. Each has a void cut from the side to give the top a curve in the vertical. I was able to drop a swept blend wallcap on the one wall object, using 3d picked path. But not on the other wall object. I have tried making the other wall object modelled from just one of the arcs. I tried copying the "successful" wall and adding a cap. Failure on

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            #6
            I see... well, but I think that the mass can't just stay there, you need to convert it into something, most likely a wall, so that the mass takes material. Otherwise it would be kind of transparent, and only visible when "show mass" mode is on.

            If you want to do it this way, it is like this: from a 3d view, do an in-place mass. Create 3 reference points: one endpoint, the midpoint, and the other endpoint of the top of the curved wall that you have as a template. Then select the 3 points and use "Spline through points". Then, set a work plane to the vertical plane of the middle reference point, and draw a rectangle of 1.5" x 3" centered on that point. Then select both the rectangle and the spline/reference line, and use "Create form". Then finish mass. So this is the mass, but, as I said, you must turn it into something... Then, Massing and Site > Wall by face > select one of the side faces, then, edit the wall to be 3" thick.
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              #7
              Well, you could paint the mass so you won't need to apply a wall or something and don't have to have the mass visibility on.
              Martijn de Riet
              Professional Revit Consultant | Revit API Developer
              MdR Advies
              Planta1 Revit Online Consulting

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                #8
                I am not so sure about that. I see that there are 2 visibility control for masses:

                1) Checking "Mass" in Visibility/Graphics, and
                2) Using the "Show mass..." button from the ribbon.

                The second control has precedence over the first one. In order to view the painted mass (or even not painted), the "Show mass..." mode needs to be active, even if "Mass" is unchecked in V/G. My concern with the approach of just painting without converting to something is that you need to keep this "Show mass..." mode active, and that might reveal some other masses that one might need to keep hidden. What do you think?
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                  #9
                  You're absolutely right Alf. I was under the wrong impression that painting a Mass would make the painted surface visible even if Show Mass was off. But that's not true. So in that case, I agree with you that you're best off converting it.
                  Martijn de Riet
                  Professional Revit Consultant | Revit API Developer
                  MdR Advies
                  Planta1 Revit Online Consulting

                  Comment

                    #10
                    It would be good to have that simplicity, though, of painting a mass and/or converting it to any category, without having to convert it to some certain type of objects, only. In this case, the OP was doing a piece of a railing. But a mass can't be a railing. I understand that masses are intended for more global desing intentions, the whole building, etc, but it wouldn't hurt to see masses in the future being able to be converted into any other "minor" categories, too.
                    Freelance BIM Provider at Autodesk Services Marketplace | Linkedin

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