I am looking for design advice, I have to make a railing for a concrete staircase 1/4 turning in curve, my boss has raised each step with a laser and I end up with a 3D curve. How do I go about recreating the staircase and creating a railing afterwards.
You will have to start by creating the curve of the bottom to make the support surface and then extrude it / thicken the surface over 100mm, it's enough to have an idea of the railing.
On the other hand , if you have to redo the whole staircase, you would have needed the curve below (in any case) and the curve of the steps against the wall, which gives the direction of each step.
Note that there are 2 steps to be redone too, due to the temporary railing.
Be careful on your reading, the points are connected by lines and not curves so you will also have to recreate the "real" curvature. (removal of material by the view above would be a choice)
You can submit your 3D sketch obtained with the scan.
By passing a curve through the extreme points (spline function), you will have the reproduced look, then as the previous answer informs you, project the different steps in one direction (towards the wall and horizontally).
The intermediate landing access is less simple but no guardrail there, no big deal.
Maybe provide support for the whole (intermediate pillar), staircase, adjoining ramp, no connection with the wall of the house?
For the two parts (upper (with the steps) and lower (curve of the concrete formwork) use of the offset of the first 3D spline.