# Where Geometry.Extrusion Srf?

**URL:** <https://discourse.mcneel.com/t/where-geometry-extrusion-srf/8404>\
**Category:** Rhino Developer\
**Created:** [May 15, 2014, 10:51am UTC](https://discourse.mcneel.com/t/where-geometry-extrusion-srf/8404 "2014-05-15T10:51:13Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jordy1989](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jordy1989/32/282567_2.png) [@jordy1989](https://discourse.mcneel.com/u/jordy1989)\
**Post date:** [May 15, 2014, 10:51am UTC](https://discourse.mcneel.com/t/where-geometry-extrusion-srf/8404/1 "2014-05-15T10:51:13Z")

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I want too extrude a surface in both directions.

Geometry.Extrusion.CreateExtrusion etc. only know curves. Where are the surface extrusions hiding? 😛

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**Author:** ![menno](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/menno/32/770384_2.png) [@menno](https://discourse.mcneel.com/u/menno)\
**Post date:** [May 15, 2014, 11:56am UTC](https://discourse.mcneel.com/t/where-geometry-extrusion-srf/8404/2 "2014-05-15T11:56:20Z")

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It seems that ExtrudeSrf is nothing more than ExtrudeCrv on each of the edges. But I may be wrong.

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<div class="post-metadata">

**Author:** ![jordy1989](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jordy1989/32/282567_2.png) [@jordy1989](https://discourse.mcneel.com/u/jordy1989)\
**Post date:** [May 15, 2014, 11:58am UTC](https://discourse.mcneel.com/t/where-geometry-extrusion-srf/8404/3 "2014-05-15T11:58:33Z")

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Was thinking the same when I was eating. Good time to think.

thanks 🙂

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<div class="post-metadata">

**Author:** ![dale](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dale/32/685184_2.png) [@dale](https://discourse.mcneel.com/u/dale)\
**Post date:** [May 15, 2014, 3:47pm UTC](https://discourse.mcneel.com/t/where-geometry-extrusion-srf/8404/4 "2014-05-15T15:47:27Z")

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For surfaces, you can use:

```auto
Rhino.Geometry.BrepFace.CreateExtrusion
Rhino.Geometry.BrepFace.CreateExtrusionToPoint

```