create stair using selcetion

[Anonymous]

Does anyone tell me how to use this tool?

look at the help, i drew a fill and a poly line for directon, then select all, click the "tool- create stair using selection" but just wrong.
EY

[Erika Epstein]

Using Archicad's stairmaker you can make it by combining 2 stairs that go together; a 'U' shape and a straight one or two 'L' shaped.

Or you could make it with slabs for each tread

[Anonymous]

Risers MUST NOT connect into the same points if you use the command "Create Stair Using Selection...."!!

[Anonymous]

I was able to make that stairs after making some changes to the dimensions.

[Anonymous]

Here are the Geometry Settings:

[Anonymous]

Erika wrote:
Using Archicad's stairmaker you can make it by combining 2 stairs that go together; a 'U' shape and a straight one or two 'L' shaped.

Before I ask my question, I've made stairs that way for 3D view, but I need correct 2D symbol too. Now I drew it with lines.

Erika wrote:
Or you could make it with slabs for each tread

Yes, I know. With slabs it is possible to create many things, not only stairs. But slabs are good only for 3D.

andro55 wrote:
Risers MUST NOT connect into the same points if you use the command "Create Stair Using Selection...."!!

andro55 wrote:
I was able to make that stairs after making some changes to the dimensions.

Thank you. Of course I have only 4.1×4.1 meters for stair. It turns out that I can't have 1800 mm for second run, therefore I need thread depth smaller than 300 mm...

Thanks for answers.

[alemanda]

I created a stair usign the selection. But I have a problem with the bottom surface of the stair.
Is there any tip to obtain a more regular bottom surface of the stair? Look at the attached picture. I got the bottom part like black line (it's not a plane) but I'd like to obtain the bottom part as the red line (a plane). Is it possible?
Hot to get it?

[Anonymous]

Not possible with just the stair tool alone,
The line you want is not parallel to the nose of the treads. In stairs the bottom plane ALWAYS follows the angle created by placing a line from nose to nose of each tread.

Actually almost anything is possible in AC. What you will need is to use the SEO command to subtract that bit of stair you dont want to see. Place a roof along red line then use the SEO to subtraction with downwards extrusion.

SEO = >Design Menu > Solid Element Operations

[Karl Ottenstein]

Agree with Mark about the angle of the bottom plane.

You can freely edit the stair (and lose all parametrics) if you convert it to a Morph and edit the morph.

If such editing is necessary, I highly recommend that you do not simply convert to Morph - as the original stair object will be deleted. Instead, make a copy of the stairs, and convert the copy to a Morph (potentially unioning the individual morphs that you get). Put the original stair object on a hidden layer, so that it still exists if you need to parametrically edit it ... and convert to morph again.

[alemanda]

MarkMoscrip wrote:
... In stairs the bottom plane ALWAYS follows the angle created by placing a line from nose to nose of each tread.

I studied other cases and I found that:
Yes, stairmaker builds the bottom plane as you described, but it provides this strange bottom plane (which it is not a plane but a coon surface) when the bottom plane intersects the bottom surface of the landing inside the landing itself.
When the intersection occurs outside the landing the bottom plane is really a plane.
This intersection depends on the number of treads along each flight
It is not a really bug but I think it could be fixed.
It happens only with the stair-from-selection tool. Same case with the C-shaped stair (using the template of stairmaker) provides the correct bottom plane with the right intersection inside the landing.

[Anonymous]

When you made the stair are you sure your line of travel was perfectly centered to the bottom and the top of this run? If not - you will get a thicker slab depth on one side (at one end only) than the other. This might be your issue. It does not take much difference to produce an angled intersection like that one.

Unless you hold down the shift key to constrain the [travel] line, AC has a horrible habit of selecting a point very close to - but not what you intended.

In practice, AC's ability to select objects or points is a weakness. Even after you have selected and verified that you have the point or object you want, AC can and will change the selection to another nearby/underlying object, be very vigilant before and after executing any command involving selection to check it did what you intended.

It is helpful to turn off trace if you are experiencing this issue.

Also use saved views to reduce the number of layers when working in a particular mode. For example with the stairs you are probably focused on vertical circulation, and can have a saved view that removes furniture, equipment, most 2d, and other non-structural elements including any meshes. This technique will speed up your work as it helps you see the bones of the building faster and detect errors more easily. Most importantly - it gives AC fewer opportunities to pick extraneous elements.