# Planar surfaces from non planar surfaces for Digital Fabrication

**URL:** <https://discourse.mcneel.com/t/planar-surfaces-from-non-planar-surfaces-for-digital-fabrication/106006>\
**Category:** Grasshopper\
**Created:** [July 22, 2020, 1:59am UTC](https://discourse.mcneel.com/t/planar-surfaces-from-non-planar-surfaces-for-digital-fabrication/106006 "2020-07-22T01:59:34Z")\
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**Author:** ![DanielPiker](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/danielpiker/32/666337_2.png) [@DanielPiker](https://discourse.mcneel.com/u/DanielPiker)\
**Post date:** [July 22, 2020, 8:12am UTC](https://discourse.mcneel.com/t/planar-surfaces-from-non-planar-surfaces-for-digital-fabrication/106006/4 "2020-07-22T08:12:31Z")

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Dividing along the ruling directions gives twisted strips, that need to be stretched or triangulated to unroll.

For planar quad panels on a doubly curved surface, your meshing directions should follow the principal curvatures. For a saddle it looks like this:

> [@Planar quads on a surface using kangaroo](https://discourse.mcneel.com/t/planar-quads-on-a-surface-using-kangaroo/83609/7):
>
> [planar\_soap.gh](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/6/3/637b01340238bfc77fe6148b87c48ee2d9643ba3.gh) (12.9 KB)

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