Elliptical (oval) stair

[Anonymous]

is there a way to design a spiral stair with solid side wall based on an oval shape?

[Dwight]

model it with walls and slabs.

[Anonymous]

Dwight wrote:
model it with walls and slabs.

That's what I thought, but how can you get the side wall to follow the tread of the stair (like a spiral?)

[Dwight]

you draw a curved wall and smack the treads on.

make a sketch.

[Anonymous]

See here:

[Anonymous]

...and here

[Karl Ottenstein]

You can model such a wall with a curved wall, as Dwight says, and then trim the top and bottom of it by using the curved ramp object in the library.

Or, you can purchase the Objective add-on which makes sloped extruded curved objects pretty straightforward:
http://www.encina.co.uk/objective.html
but, the result is an object and not a wall, in case that matters, so no section skins, core-only, etc. See also this thread:

http://archicad-talk.graphisoft.com/viewtopic.php?p=126434&highlight=curved+wall+objective#126434

Karl

[Anonymous]

But isn't the curved ramp based on a circle? My stair is oval...

[Dwight]

CLose enough, but not a smooth trimmer.

[Dwight]

closer view