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Forums >> Revit Building >> Technical Support >> Twisting 3D sweep
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Joined: Tue, Jan 10, 2012
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Revit Architecture 2012
When I sweep a non-circular profile down a 3-dimensional path, the vertical axis of the profile rotates
as the path changes direction. Is there a way to keep the vertical axis vertical so my profile is oriented correctly
as it sweeps down the path?
Thanks.
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Joined: Tue, May 16, 2006
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I have never had to answer this but can you control the profile orientation based on the relationship of the path to a plane hosting the path line?
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The path is on a series of reference planes in order to get the 3D effect. I have tried to set the planes a variety of ways
to try and make the profile axis stay vertical, but it always twists as the angle changes. I tried a similar sweep in sketchup
and had the same effect, although not quite as severe. I think the computer twists it to make the changes in direction
clean up better.
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What affect does checking the box "rotate with component" have in the profile family?
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Joined: Tue, May 22, 2007
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Use "Swept Blend" (2 profiles) instead of "Sweep"
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Joined: Thu, May 28, 2009
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What is your host?
Unfortunately, your profile will use the ref. plane that the line you've picked belongs to. IE, the roof plane of an eave. Under some circumstances a series of profiles can remain vertical even with a 3D path. So, what is this for?
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Swept Blend does not allow more than 1 line segment.I did it that way, with a bunch of swept blends, but the don't clean up well.
The rotate with component didn't seem to help, see attached image.
And all my reference planes are perpendicular to the ground plane. I created them using a mass with vertical sides, see image.
I am trying to recreate a balcony condition at an existing church.
Thanks for all the help, btw.
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This was the best I could get using a series of swept blends.
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Joined: Fri, Sep 22, 2006
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Attached are two simple methods of creating ramps if that is what you are after, they are both roadway oriented but could be any section. The last is a half spiral stairs under construction that I designed a few years back on Revit, and using Robot for the analysis.
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a swept blend can also have a curved path. But only one arc. That's still plenty powerful, however. You could make this railing in 1-2 segements, I think. pic related.
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Joined: Wed, Sep 26, 2007
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What is the shape of the path in plan? Is it an arc? I see some straight segments in the original post. Is it supposed to be a series of straight segments or an arc?
Anyway, I agree with the previous posts that have suggested a swept blend, probably in some 3 pieces. See attachment foran example.
Edited on: Tue, Jul 24, 2012 at 10:08:59 PM
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It is an arc, but the path it follows doesn't have consistent slope, so one swept blend won't work. I tried (see pic)
but the highlighted blue arc doesn't follow the true path of the balcony. I could change the segmented swept blend paths
to arcs, but trying to figure out their individual paths is going to be tough.
Thanks for all the help.
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Joined: Wed, Sep 26, 2007
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If it is a series of straight segments, at different elevations, probably you could use an adaptive family, similar towhat is shown in this video, adjusting the idea to your needs:
http://www.youtube.com/watch?v=GsJNn0pi994
Edited on: Wed, Jul 25, 2012 at 8:55:07 AM
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Alf - I would like to see your results using that family on something like a site plan that undulates in 3D.
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It works fine, given that there are references (workplanes, ref. planes, faces) that the points can use to attach to.
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