# Multiple curves of stairs steps to multiple surfaces

**URL:** <https://it.discourse.mcneel.com/t/multiple-curves-of-stairs-steps-to-multiple-surfaces/8638>\
**Category:** Bar-Rhino\
**Created:** [15 Dicembre 2025, 3:04pm UTC](https://it.discourse.mcneel.com/t/multiple-curves-of-stairs-steps-to-multiple-surfaces/8638 "2025-12-15T15:04:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Tarik\_Suifil](https://sea3.discourse-cdn.com/mcneel/user_avatar/it.discourse.mcneel.com/tarik_suifil/32/21950_2.png) [@Tarik\_Suifil](https://it.discourse.mcneel.com/u/Tarik_Suifil)\
**Post date:** [15 Dicembre 2025, 3:04pm UTC](https://it.discourse.mcneel.com/t/multiple-curves-of-stairs-steps-to-multiple-surfaces/8638/1 "2025-12-15T15:04:04Z")

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Hi Everyone,

there is a way please to create all the surfaces of the steps from the curves in one time ?

 ![Cattura](https://global.discourse-cdn.com/mcneel/uploads/mcneel_it/original/3X/d/c/dc68486feb02a1ca8573d6d3f2bd8a6aabb3752f.jpeg)

Thank you in advance

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**Author:** ![leopoldomonzani](https://sea3.discourse-cdn.com/mcneel/user_avatar/it.discourse.mcneel.com/leopoldomonzani/32/17957_2.png) [@leopoldomonzani](https://it.discourse.mcneel.com/u/leopoldomonzani)\
**Post date:** [15 Dicembre 2025, 4:49pm UTC](https://it.discourse.mcneel.com/t/multiple-curves-of-stairs-steps-to-multiple-surfaces/8638/2 "2025-12-15T16:49:32Z")

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[stairs.gh](https://it.discourse.mcneel.com/uploads/short-url/sXBln25pGgn85wujalIHCPX5BHO.gh) (21,4 KB)

 ![image](https://global.discourse-cdn.com/mcneel/uploads/mcneel_it/original/3X/d/6/d6ef887dfc42155cd742b221678aa655ac778f61.png)

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**Author:** ![giuseppe](https://sea3.discourse-cdn.com/mcneel/user_avatar/it.discourse.mcneel.com/giuseppe/32/16416_2.png) [@giuseppe](https://it.discourse.mcneel.com/u/giuseppe)\
**Post date:** [17 Dicembre 2025, 4:18pm UTC](https://it.discourse.mcneel.com/t/multiple-curves-of-stairs-steps-to-multiple-surfaces/8638/3 "2025-12-17T16:18:43Z")

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Welcome Tarik.

NURBS Surfaces (Srfs) are 4 sided topologies.

Looking at your model:

Each step (srf) has one shared edge where vertical and horizontal meet. You can not just window pick all the curves and call a surfacing command for all of them at once. Rhino can not understand how to sort the curves out .

A possible solution:

(1) Join the outer “stepping” curves into one composite curve. Same for the opposite side.

(2) Loft the composite curves.

 ![Screenshot 2025-12-17 172430](https://global.discourse-cdn.com/mcneel/uploads/mcneel_it/original/3X/3/8/38c9e68aa53887b0cabf42b0825fb8604ba15338.jpeg)

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**Author:** ![Tarik\_Suifil](https://sea3.discourse-cdn.com/mcneel/user_avatar/it.discourse.mcneel.com/tarik_suifil/32/21950_2.png) [@Tarik\_Suifil](https://it.discourse.mcneel.com/u/Tarik_Suifil)\
**Post date:** [17 Dicembre 2025, 4:48pm UTC](https://it.discourse.mcneel.com/t/multiple-curves-of-stairs-steps-to-multiple-surfaces/8638/4 "2025-12-17T16:48:26Z")

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Thanks a lot for your response. I resoleved with DUPBORDER command because I had already the geometry.