topic Re: Staircase - Starting from a corner in Modeling

Staircase - Starting from a corner

Anonymous — Thu, 25 May 2023 14:38:37 GMT

Hi, I'm having a problem building a staircase.

On the left I built a 3D staircase very simply using individual floor slabs with 2D annotation over the top. Now I'm learning about how to use the proper 3D stairs but so far I can't figure out a way to get the 3D to match the 2D. I need my staircase to have the angled corner style, but I also need the staircase to START on the angled corner like it's shown on the left. Anytime I try to manipulate the 3D stair it snaps to a straight run. Is there a tickbox somewhere to specify 'start on the corner' or a work around that anybody knows of?

Also, how do I control the style of the stair run arrow, I want to take off the little circle at the end.

I'm running ArchiCAD 22.

Thanks!
Hannah

Re: Staircase - Starting from a corner

David Maudlin — Fri, 24 Apr 2020 12:12:32 GMT

CattaH wrote:
Also, how do I control the style of the stair run arrow, I want to take off the little circle at the end.

For the stair symbol, see this thread: EDIT STAIR LINE.

You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.

David

Re: Staircase - Starting from a corner

Ahmed_K — Fri, 24 Apr 2020 22:21:16 GMT

i have to say that i was suffering when i used the new stair tool for a log time, after that i spent two days to learn it , step per step, and i was able to create TONS of stairs,
the secret is : correct measurements of stairs + staircase, and correct drawing,

Re: Staircase - Starting from a corner

Minh Nguyen — Sun, 26 Apr 2020 20:03:18 GMT

Hi Hannah,

Thank you for your question!

The reason why it is difficult to model this stair is because of the stair's rules set in its settings. We need to remove certain limitations, and "cheat" a little bit in order to draw this stair in ARCHICAD. Here I attached a GIF on how to create the stair. To make sure we have 2 steps at the winder, remember to set Fixed Number of Goings to 2 in the InfoBox

It's not perfect, as there is still a tiny gap at the beginning and the end, but I hope this helps!

Note that in 3D, due to the stair's shape, the structure doesn't look quite right. This is a limitation of ARCHICAD, as we cannot alter the stair's structure. I suggest using Filled structure, as can be seen in the screenshot below

Let me know if you have any further questions!

Thank you very much!

Best regards,
Minh

Re: Staircase - Starting from a corner

Lingwisyer — Tue, 28 Apr 2020 01:19:26 GMT

This has been an issue since the introduction of the Stair Tool...

https://archicad-talk.graphisoft.com/viewtopic.php?f=20&t=57826&hilit=stair+winder+start&start=20

Re: Staircase - Starting from a corner

Minh Nguyen — Tue, 28 Apr 2020 09:22:51 GMT

Hi Ling,

That method is even better than mine! Thank you very much for sharing!

Have a great day!

Best regards,
Minh

Re: Staircase - Starting from a corner

Ahmed_K — Tue, 28 Apr 2020 21:40:33 GMT

Here is a solution , i hope it helps
https://streamable.com/g5r6cu
https://streamable.com/g5r6cu

Re: Staircase - Starting from a corner

Barry Kelly — Wed, 29 Apr 2020 01:21:03 GMT

The post that Ling linked to is an old post by me back in version 21.
Version 22 improved it and there is no need for the small offset anymore.

Now this is where things get frustrating though.
bouhmidage has added a great video showing exactly what you need to do.
I have done this many times myself with no problems.
However I just tried it again in 23, expecting it to work, and it didn't quite.
I didn't get the winder at the end, but it was easy to fix.

Make sure your stair rules are set before you start.

Then place the stair as boughmidage has shown you.

I just had to reset the last 'winder' node so it had 2 winders.

I have done it fine many times before (but that would have been in 22).
So not sure if there is some other setting somewhere affecting it or if it is just a change in 23.
That is the frustrating part, trying to figure out why it works for some and not others.

Barry.

Re: Staircase - Starting from a corner

Laszlo Nagy — Wed, 29 Apr 2020 19:25:44 GMT

These are all good posts, but I think they still do not do what the OP is trying to achieve. If I see it correctly, the top of the Stair has an additional Tread at a 45 degree angle, which is also the last Tread. I think that is the really hard part to achieve.

Re: Staircase - Starting from a corner

Barry Kelly — Thu, 30 Apr 2020 01:36:29 GMT

LaszloNagy wrote:
These are all good posts, but I think they still do not do what the OP is trying to achieve. If I see it correctly, the top of the Stair has an additional Tread at a 45 degree angle, which is also the last Tread. I think that is the really hard part to achieve.

No that is not possible - at least not easily that I can see - not even by editing the boundary of the last tread.
The winders must be a rectangle - but can be divided into multiple treads.
So it must be a 90° or 180° winder if there are no additional treads.

If that extra red triangle tread is required, maybe do the top winder as a separate circular stair and then amend the boundary to the required angular shape.

Barry.

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 18:35:48 GMT

I figured out how to do it.
It is indeed the way you say it Barry, the Stair must be turned back parallel to its length at the top.
In the next posts I will detail it. But this is the final result:

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 18:46:13 GMT

First of all, set all the important parameters in the Settings Dialog before starting to create the Stair, including number of Treads and the "Winder with Equal Angles" option, with 2 Goings.

Then I think it is a good idea to draw the outlines of how the Stair should look in the floor Plan, which will help when drawing the Stair Baseline. So I drew it with red on the right.

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:09:47 GMT

We can now start drawing the Stair Baseline. All Baseline segments will be Flight Segments.
The Stair Baseline should be on the outside boundary of the Stair.
Now, here are some GIFs (click on them to play). In the first one you will see that I try to draw the Baseline along the outer boundary, but it does not give the correct result because I run out of Treads before I could turn the Stair back 180 degrees.

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:13:52 GMT

So what we can do is something which I was told about by Marta Molnar from GRAPHISOFT HQ.
I make the Stair shorter so I can turn it back 180 degrees, then I modify the Baseline polygon to the desired shape (Click image to play GIF).

At the end of the GIF you can see that the Walking Line is not correct, but we will handled that later.

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:25:29 GMT

Now, we select the Stair in 3D and enter Edit Mode.
We select the Stair Structure, and use our little-known little friend, the Split Stair Structure command from the context menu, then split the Stair at its last Riser.
This way the Structure below the last Tread can be independently set and we will be able to turn it OFF, along with the Riser and Tread (Click image to play GIF).

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:29:08 GMT

While still in Edit Mode, we can now simply select the separate Stair Structure under the top step and turn it OFF. We can do the same with the Tread and Riser. (Click image to play GIF.)

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:31:15 GMT

So now we have achieved the desired 3D of the Stair.
All we need to do is fix up the Floor Plan Display of the Stair.

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:38:58 GMT

We need to go to edit mode and modify the Walking Line polyline, and possibly the Numbers (each can be individually selected, moved and rotated), plus the "DOWN" text.
This is the result, which is almost perfect, except for the fact that it is not possible to hide the Floor Plan representation of that last Tread which we hid in 3D. Unfortunately, this is a limitation, because the Stair Grid is generated automatically, and it is not possible to individually select and hide Tread edges and Riser lines.

Re: Staircase - Starting from a corner

Laszlo Nagy — Thu, 30 Apr 2020 19:43:45 GMT

So, all I could do is to take an old trick and just cover that last Tread on the Floor Plan with a Fill that has the same background as the Floor Plan Viewpoint. This is the final result:

Re: Staircase - Starting from a corner

Ahmed_K — Thu, 30 Apr 2020 20:08:56 GMT

LaszloNagy , very nice solution !