# \#surfaceintersection

**URL:** https://discourse.mcneel.com/tag/surfaceintersection/201.md

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## [Issue with Brep/plane intersection and contour: nonplanar curve outputs](https://discourse.mcneel.com/t/issue-with-brep-plane-intersection-and-contour-nonplanar-curve-outputs/218915)

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**Author:** [@Elena\_Vazquez\_Peña](https://discourse.mcneel.com/u/Elena_Vazquez_Pe%C3%B1a)\
**Replies:** 1\
**Last updated:** [May 11, 2026, 5:38pm UTC](https://discourse.mcneel.com/t/issue-with-brep-plane-intersection-and-contour-nonplanar-curve-outputs/218915 "2026-05-11T17:38:56Z")

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Hi, I am having weird results in a brep/plane intersection and with contour in GH. I also tried contour (in Rhino) and got similar results: nonplanar curve outputs in the top and bottom: Any ideas why this is happe…

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## [Intersect Fail on Saddle Shape](https://discourse.mcneel.com/t/intersect-fail-on-saddle-shape/196063)

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**Author:** [@Measure](https://discourse.mcneel.com/u/Measure)\
**Replies:** 4\
**Last updated:** [December 5, 2024, 10:46pm UTC](https://discourse.mcneel.com/t/intersect-fail-on-saddle-shape/196063 "2024-12-05T22:46:13Z")

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Trying to trim a cylinder with this saddle shape with circular arc cross sections. Trim, Split, Intersect all fail. Saddle Trim.3dm (128.8 KB)

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## [Projection of helix on free flowing, irregular tubular structure](https://discourse.mcneel.com/t/projection-of-helix-on-free-flowing-irregular-tubular-structure/190447)

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**Author:** [@tc11](https://discourse.mcneel.com/u/tc11)\
**Replies:** 4\
**Last updated:** [September 1, 2024, 12:03pm UTC](https://discourse.mcneel.com/t/projection-of-helix-on-free-flowing-irregular-tubular-structure/190447 "2024-09-01T12:03:10Z")

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Hello everyone, I am trying to find the intersection of a a helix with an irregular, free flowing tube. The tube is created with a series of profiles along a curve and a sweep1 selecting all these profiles. The next s…

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## [Intersect, resulting curve](https://discourse.mcneel.com/t/intersect-resulting-curve/177335)

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**Author:** [@Jure\_Bebić](https://discourse.mcneel.com/u/Jure_Bebi%C4%87)\
**Replies:** 4\
**Last updated:** [March 6, 2024, 1:12pm UTC](https://discourse.mcneel.com/t/intersect-resulting-curve/177335 "2024-03-06T13:12:47Z")

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Is there a way to obtain the same curve as ExtractIsocurve would get you when using the Intersect command and why does Intersect even try to interpolate a curve (tolerance setting?) ?

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## [Intersection area](https://discourse.mcneel.com/t/intersection-area/142354)

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**Author:** [@Agache\_Aurelian](https://discourse.mcneel.com/u/Agache_Aurelian)\
**Replies:** 4\
**Last updated:** [May 10, 2022, 6:23pm UTC](https://discourse.mcneel.com/t/intersection-area/142354 "2022-05-10T18:23:21Z")

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Intersection area between a horizontal plane, a transverse plane and the hull of a ship Hi, guys, I’m a beginner and I’m stuck on a project. I have the hull of a ship and I want to find the area of ​​a transverse plane…

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## [Surface connection](https://discourse.mcneel.com/t/surface-connection/125756)

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**Author:** [@kaizdd](https://discourse.mcneel.com/u/kaizdd)\
**Replies:** 18\
**Last updated:** [June 17, 2021, 8:38pm UTC](https://discourse.mcneel.com/t/surface-connection/125756 "2021-06-17T20:38:12Z")

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Hi, I am trying to recreate these surfaces, but cannot find a solution. I got two approaches, but I’m not sure how to proceed. Now I am looking for hints how to solve this. I’m looking forward to any suggesti…

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## [Selection of building footprints, and region union not working](https://discourse.mcneel.com/t/selection-of-building-footprints-and-region-union-not-working/93881)

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**Author:** [@diellzaelshanni](https://discourse.mcneel.com/u/diellzaelshanni)\
**Replies:** 6\
**Last updated:** [December 19, 2019, 3:48pm UTC](https://discourse.mcneel.com/t/selection-of-building-footprints-and-region-union-not-working/93881 "2019-12-19T15:48:09Z")

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Hello people, I need to select the only the outer contour - the footprint of some buildings(which are in the same level) as curves-or surfaces and unify their regions afterwards, does anyone has any suggestion or Gh def…

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## [Solving and quantifying intersections for a set of multiple breps](https://discourse.mcneel.com/t/solving-and-quantifying-intersections-for-a-set-of-multiple-breps/78032)

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**Author:** [@frandecu](https://discourse.mcneel.com/u/frandecu)\
**Replies:** 6\
**Last updated:** [January 31, 2019, 8:59am UTC](https://discourse.mcneel.com/t/solving-and-quantifying-intersections-for-a-set-of-multiple-breps/78032 "2019-01-31T08:59:03Z")

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Hello, my name is Fran. I have a set of multiple breps that intersect with each other. I’d like to isolate the intersected regions and to separate them into categories of how many intersections there are. As in having al…

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## [Cannot Merge three surfaces at a center curve and different color for each edge of a surface](https://discourse.mcneel.com/t/cannot-merge-three-surfaces-at-a-center-curve-and-different-color-for-each-edge-of-a-surface/48214)

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**Author:** [@Chintan\_Patel](https://discourse.mcneel.com/u/Chintan_Patel)\
**Replies:** 8\
**Last updated:** [October 15, 2017, 3:00am UTC](https://discourse.mcneel.com/t/cannot-merge-three-surfaces-at-a-center-curve-and-different-color-for-each-edge-of-a-surface/48214 "2017-10-15T03:00:39Z")

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Hi, I have been trying to merge three surfaces at a single curve since three days. I am new to Rhino. Also, I extruded the letter T in one direction and got a surface. Merge three surface at the center curve.3dm (105.5…

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## [Intersection of Curve with Surface](https://discourse.mcneel.com/t/intersection-of-curve-with-surface/45991)

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**Author:** [@Kanisha\_Patel](https://discourse.mcneel.com/u/Kanisha_Patel)\
**Replies:** 2\
**Last updated:** [August 4, 2017, 4:16pm UTC](https://discourse.mcneel.com/t/intersection-of-curve-with-surface/45991 "2017-08-04T16:16:00Z")

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Python for Rhino - Intersection of a Curve with a Surface Hi all – I am looking for some help on a script that essentially will use ray shoot to calculate the walkable surface in a kitchen and detect areas in the kitche…

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## [Intersection Problem](https://discourse.mcneel.com/t/intersection-problem/38316)

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**Author:** [@eebs99](https://discourse.mcneel.com/u/eebs99)\
**Replies:** 5\
**Last updated:** [November 2, 2016, 12:59am UTC](https://discourse.mcneel.com/t/intersection-problem/38316 "2016-11-02T00:59:29Z")

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I'm trying to get the intersection of the surfaces from this file: https://drive.google.com/file/d/0B0Ajw12i6iM7emdLTmpBLWdodTA/view?usp=sharing I always get "0 intersections" when I run the command. Is there anythin…

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## [Need a workaround when brep | brep intersect returns an incomplete set of curves](https://discourse.mcneel.com/t/need-a-workaround-when-brep-brep-intersect-returns-an-incomplete-set-of-curves/36398)

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**Author:** [@neobobkrause](https://discourse.mcneel.com/u/neobobkrause)\
**Replies:** 13\
**Last updated:** [October 5, 2016, 5:52am UTC](https://discourse.mcneel.com/t/need-a-workaround-when-brep-brep-intersect-returns-an-incomplete-set-of-curves/36398 "2016-10-05T05:52:13Z")

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I’m using Rhino (and Grasshopper) to generate some geometry. However some operations in that process are apparently running into a known problem area related to the intersection of two surfaces. Brian in tech support has…

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## [Surface Trimming](https://discourse.mcneel.com/t/surface-trimming/34671)

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**Author:** [@kahasim](https://discourse.mcneel.com/u/kahasim)\
**Replies:** 1\
**Last updated:** [July 15, 2016, 5:31pm UTC](https://discourse.mcneel.com/t/surface-trimming/34671 "2016-07-15T17:31:47Z")

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Hi everyone; I'm new either to Rhino and forum. My question is I want to create a rectangular surface and a quarter circular surface intersects the first rectangular one. To achieve this I just used the "control point cu…

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## [How to model this](https://discourse.mcneel.com/t/how-to-model-this/29140)

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**Author:** [@HANSIO](https://discourse.mcneel.com/u/HANSIO)\
**Replies:** 5\
**Last updated:** [February 9, 2016, 3:08pm UTC](https://discourse.mcneel.com/t/how-to-model-this/29140 "2016-02-09T15:08:59Z")

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Hi everyone, I wnat to model something like that https://s-media-cache-ak0.pinimg.com/564x/6f/7f/ea/6f7fea7eafe097ce8d5ef0f4cb11876f.jpg and im getting crazy with booleans. Everything I try fails... Any ideas?

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## [Planar intersection gives non-planar intersection curves](https://discourse.mcneel.com/t/planar-intersection-gives-non-planar-intersection-curves/26884)

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**Author:** [@menno](https://discourse.mcneel.com/u/menno)\
**Replies:** 3\
**Last updated:** [November 19, 2015, 8:56pm UTC](https://discourse.mcneel.com/t/planar-intersection-gives-non-planar-intersection-curves/26884 "2015-11-19T20:56:38Z")

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I ran into this today: depending on the tolerance settings (0.001 or 0.01) the intersection curve between the plane and the curved surface is planar or non-planar, respectively. Interestingly, the incorrect non-planar …