Forums >> Workflow & Implementation >> Training >> How do you create a concentric spiral?

MrFish

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Hi mates!

Its been a while since I was last on revit city, and sicne your such a reliable community I've returned! I have recently been progressing through a guidebook for Autodesk Revit and it hasn't correctly explained how to create a concentric spiral using a wall. So, hopefully someone can provide an answer for me, and if you need further information about the book, or a picture, please ask.

Much thanks!

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MrFish

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Just to re-iterate, this is with wall.

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WWHub

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Joined: Tue, May 16, 2006
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Something like this?

Created spline mass then did wall by face.

Attached Images

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MrFish

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Hi WWHub, what I intend to create is shown in the attachments. I'm having difficulty with the spiral in making sure that the walls are evenly spaced from each other.

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WWHub

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That is a different question.  If you are having problems laying it out, how do you expect to have it built?

I suggest you do an approximation using arcs.  We always did this for ellipses when we hand drafted them using a compass.  You can create the same visual affect with the ellipse.  And you can dimension it if you use true arcs.

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MrFish

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Hi WWHUd, sorry for my lack of knowledge, I only just graduated from high school. I am an architectural enthusiast and am still learning to use Revit, self-taught. When you talk about approximation using arcs, is that a specific formula I use to create the spiral? Or is there an option within Revit?

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WWHub

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I have never had to document a spiral.  Here is a response I posted earlier on how to approximate an ellipse:

When we hand drafted and needed an ellipse (before templates '60's), we always used an approximation as described in the first link below. 

http://etc.usf.edu/clipart/76200/76201/76201_ellps_4cntr.htm

This link shows how close an appromation is to a real ellipse - note that very long, thin ellipses donot work as well.

 http://www.uwgb.edu/dutchs/MATHALGO/Ellipses.HTM

Do some searching on-line and you may find something similar for a spiral.

BTW - NOTE:  If you use wall by face on a spiral done from a spline, the wall will have no plan layer lines or cut hatching at fine or medium views.  But it will if done from arcs!

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Spiral Extrusions

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Help - curtain wall on spiral ellipse

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Beam attached to s spiral slab

1