# Problem with Lunchbox and non-rectangular surfaces. Please help!

**URL:** <https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736>\
**Category:** Grasshopper\
**Created:** [November 8, 2019, 3:44pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736 "2019-11-08T15:44:23Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![lozinskikarol](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lozinskikarol/32/185598_2.png) [@lozinskikarol](https://discourse.mcneel.com/u/lozinskikarol)\
**Post date:** [November 8, 2019, 3:44pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/1 "2019-11-08T15:44:23Z")

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Hello,  
I have a huge problem with Lunchbox. I need to create a bulding with a moutain-like facade with triangular panels. I thought that Lunchbox will be great. And thats when problem begun. It turns out that Lunchbox has very hard time with such surfaces.

 ![Adnotacja%202019-11-08%20160722](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/7/e/7ebf2c7464f64688c3f379380fb637602abb3b29.png)

I made it by drawing a simple polygon using polyline within rhino. Then in grasshopper I used boundary surface and baked. Then I rebuilt the surface in Rhino and lifted on of the vertices. This is not the final building but the method and workflow is the same.

When I had this surface I plugged it right to Lunchbox and this happend.

 ![Adnotacja%202019-11-08%20160805](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/4/1/410baf13f92f1f1bb7e2e5a745eb9463da379dcf.png)  
 ![Adnotacja%202019-11-08%20160911](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/6/b/6b51baa9600af6f78aa9d2cc2cc954ed70be6bcd.png)

By now I think I tried everything - that’s why I am writing here. From reparameterizing, through Surface Split, Region and Solid Intersection, Brep | Brep, Patching. I even recreated whole surface in Grasshopper throuhg Isotrim, Attractors and Surface from Points and it all did nothing. I also tried Surface Morph but it not only almost killed my laptop - it also doesn’t work.

If anyone has any ANY idea how to do it - maybe different plugins, some Rhino magic, anything - please, please help!

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**Author:** ![lozinskikarol](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lozinskikarol/32/185598_2.png) [@lozinskikarol](https://discourse.mcneel.com/u/lozinskikarol)\
**Post date:** [November 8, 2019, 4:04pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/3 "2019-11-08T16:04:20Z")

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Here’s the file.  
[LB.gh](https://discourse.mcneel.com/uploads/short-url/t0F9LedkyAnOqcCMG1MGc18Hmj8.gh) (59.2 KB)

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**Author:** ![HS\_Kim](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/hs_kim/32/473975_2.png) [@HS\_Kim](https://discourse.mcneel.com/u/HS_Kim)\
**Post date:** [November 8, 2019, 4:21pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/4 "2019-11-08T16:21:26Z")

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You are suffering from the typical trimmed surface subdivision problem.  
Have a look at the attachment.

 ![Canvas%20at%2001%3B19%3B30](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/f/b/fbe86dcada6e839b41a5c53f4c3fe678fd6356d5.png)  
[LB\_re.gh](https://discourse.mcneel.com/uploads/short-url/solPeNBvSfdISS01ms82gaekjHa.gh) (52.3 KB)

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<div class="post-metadata">

**Author:** ![lozinskikarol](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lozinskikarol/32/185598_2.png) [@lozinskikarol](https://discourse.mcneel.com/u/lozinskikarol)\
**Post date:** [November 8, 2019, 4:37pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/5 "2019-11-08T16:37:30Z")

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This is EXACLY what I needed! Thank you! Feels quite weird if not embarrasing that what took me so many painful hours is just a “classic mistake”, nontheless I am very, very happy it is solved! Thank you once again!!

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**Author:** ![sk220297](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/sk220297/32/239101_2.png) [@sk220297](https://discourse.mcneel.com/u/sk220297)\
**Post date:** [August 1, 2020, 8:22pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/6 "2020-08-01T20:22:15Z")

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thank you so much buddy you are amazing!!! @HS_kim

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**Author:** ![Michael\_Pryor](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/michael_pryor/32/489117_2.png) [@Michael\_Pryor](https://discourse.mcneel.com/u/Michael_Pryor)\
**Post date:** [August 1, 2020, 8:50pm UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/7 "2020-08-01T20:50:56Z")

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> [@Learning Nurbs Topology for Paneling Projects](https://discourse.mcneel.com/t/learning-nurbs-topology-for-paneling-projects/105526):
>
> This question is asked a lot on the forums and is one of the biggest misunderstandings of nurbs geometry. Geometrically it makes sense if we just think about it, how would one expect a software to apply a grid to a surface without 4 edges (a grid) where there could be infinite solutions in the edge condition resolution. There must be some way we can make this understanding more obvious to users… grinning

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**Author:** ![Xinrong](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/xinrong/32/679295_2.png) [@Xinrong](https://discourse.mcneel.com/u/Xinrong)\
**Post date:** [June 14, 2023, 9:41am UTC](https://discourse.mcneel.com/t/problem-with-lunchbox-and-non-rectangular-surfaces-please-help/91736/8 "2023-06-14T09:41:38Z")

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hi kim,if we have object with two surface and one polysurface which is produced by two surface with fillets , what we should do? thanks a lot

 ![Screenshot 2023-06-14 173921](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/0/8/e/08eb64f1dce60c1e4a3b472b0635cbaa5b8d17c3.jpeg)  
[LB\_update.3dm](https://discourse.mcneel.com/uploads/short-url/knw3VACiZd5DWO9lhJkNdVMFg2N.3dm) (61.8 KB)  
[LB\_update.gh](https://discourse.mcneel.com/uploads/short-url/qCZUaNm7zitSapWtNicMxWcfpPB.gh) (64.3 KB)