Issue Description
Your stair design has a few treads with special or unusual geometry, and you would like to represent it in Archicad. Simple editing to the staircase structure with nodes might not be working as you expect it. However it is possible to reshape the stair model using Edit Mode.
Solution
Simple angle modification to the flights is possible by simply moving the staircase's nodes
More precise editing can be done by selecting the stair and clicking on Edit to activate Edit Mode
Here you will notice we can select different elements from the stair such as the tread and riser cladding. As shown below
Note that when selecting the stair by clicking on the tread you will not be able to directly modify the steps' structure, instead, you will be reshaping the cladding.
To edit the structure make sure to select the Stair by clicking on the Flight's outline, opposite to the staircase's Reference Line
As you click around the edges and nodes of your stair, you will notice in the pet pallet that you can Add nodes, Curve Edges, Add Fillets/Chamfers to corners, and other common modifications.
Workaround
If you have a situation in which you find the stair steps cannot be modified to your liking (for example the picture below), you can use slabs to supplement the treads.
- Create a Slab Composite that Matches the materials of your staircase and the layer thickness of the staircase Riser and Tread Cladding.
- Using the Slab tool with your new Composite, model your step extension
- You can convert the Slabs to Morphs for further editing
- Select the Morphs Right Click > Merge
- In the Morphs/Slab Selection Settings, change the element ID to match your Stair's Element ID. This will help you isolate the element for Schedules, Graphic Overrides, Find and Select, etc.
- Use the Stair Edit Mode as explained above in this article to make any final adjustments to mesh the main stair with the new steps