Creating a surface from closed helical curves

Rhino Rhino for Windows
1

elliptical stair-1.3dm (498.0 KB)

Does anyone know which tool will create a surface from this closed curve?

2

Hi,

You could just use a patch as it is, but I would only patches as a last resort because the clipped ends will affect how the surface is created.

Instead, I would:
Make a copy the enclosed curve.
Expode the copy.
Extend each end of the two long curves by a good amount.
Create a dummy curve at each end, perpendicular to the two long curves. Imagine that the stairs continued through the floor and ceiling, and your line is a ballister,
Use sweep a sweep 2 rails to create the surface.
Trim the surface using Wirecut, using the original clipped corners as a guide.

3

Hi Tortoise - Extrude the elliptical curve verticallly past the desired shape curve and then Split or Trim the result with that closed curve.

-Pascal

4

Thanks Brenda, very helpful except having trouble cutting surface with wirecut.