Thanks Mark for trying to help me !
Unfortunately I did not completely understood your technique and despite your description failed to reproduce it.
The problem with these stairs is that the basic construction lines which I received are flawed, so at some parts it is impossible to generate a clean solution, because the master curves were done in 2D without to much thinking about how everything might work in 3D. So right now I try to solve these parts as best as I can, so they at least look “acceptable”.
I have to blend the upcoming stair strings into the stair landing. In order to create a transition which works for the all stair elements I thought I´d try to create some curves first.
Here is my current problem:
fillet problem3.3dm (148.2 KB)
I am trying to construct a curve like the dashed one, which would I.) blend tangentially between A and B and II.) follow the green curve in the top view… How do you do that? I tried a I know …