Tuesday, August 9, 2011

Turn an ellipse into arcs for use in Revit

A few of the global Revit pros have had a crack at rationalizing an ellipse for use in Revit.  Zach Kron went conceptual, Phil Read trimmed his way around, and David Light played with circle-based segmentation.

What is my answer to this problem?  Simply don't do it in Revit - do it in AutoCAD.  For some people, that solution may not be acceptable, and that's ok.  I also realise that the AutoCAD haters will probably victimise me for it...oh well, do what works I say :-)

Here is how I did it:
I make an ellipse in an AutoCAD file after setting the PELLIPSE variable to 1.  This means that AutoCAD creates the ellipse as a polyline, which means it contains arcs.  I then Import / Link this into Revit and simply 'pick' the arc segments to make a nice smooth elliptical form.

Here is a video:


My method is probably the easiest of the lot, but it is also probably the least 'Revit-ee' and the least parametric...

2 comments:

  1. It's been good fun reading this post and the various reactions to it, but you all missed out one method - Let the contractor deal with it ;)

    I put this post together on converting ellipses to regular arcs:
    http://cadsetterout.com/autocad-tutorials/converting-ellipses-to-arcs/


    Seriously though - Kudos to you guys for making the effort to make sure that you geometry is suitable for downstream manufacture.

    Paul

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  2. I'm tired of having to do work arounds in Revit but thank you so much for posting this. It worked great. Thank you.

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