# Bug? Curves do not intersect

**URL:** <https://discourse.mcneel.com/t/bug-curves-do-not-intersect/110434>\
**Category:** Rhino for Mac\
**Created:** [October 15, 2020, 8:33pm UTC](https://discourse.mcneel.com/t/bug-curves-do-not-intersect/110434 "2020-10-15T20:33:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![miano](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/miano/32/762004_2.png) [@miano](https://discourse.mcneel.com/u/miano)\
**Post date:** [October 15, 2020, 8:33pm UTC](https://discourse.mcneel.com/t/bug-curves-do-not-intersect/110434/1 "2020-10-15T20:33:14Z")

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In the attached, I have a horizontal spline. Then I have a sequence of points. The uppermost point I created by intersecting a place through the curve.

So now I draw a curve through the point on the other curve. I can do line, polyline, interpretcrv, curvethroughpts, anything—

When I intersect the two curves, Rhino says they do not intersect.

Tolerance is 1/32". Visually, the two curves appear to intersect.

I can do the same at other points on the curve and they intersect.

I thought I would share this oddity.

 ![Screen Shot 2020-10-15 at 4.25.59 PM](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/b/6/b655879a438edbdbfb82f3699ba80528a0ceae19.png)  
[Problem Intersect.3dm](https://discourse.mcneel.com/uploads/short-url/AlbCpicuPdd9ouWO5sj35kuaVvZ.3dm) (3.0 MB)

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**Author:** ![pascal](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pascal/32/479395_2.png) [@pascal](https://discourse.mcneel.com/u/pascal)\
**Post date:** [October 15, 2020, 8:39pm UTC](https://discourse.mcneel.com/t/bug-curves-do-not-intersect/110434/2 "2020-10-15T20:39:13Z")

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Hello - thanks, I see that, and I do not know yet what causes this… if you `MakeUniform` the long curve, it works however. (there is a slight deviation near one end of the uniform curve compared to the original - .137 units.  
[RH-61027](https://mcneel.myjetbrains.com/youtrack/issue/RH-61027) Curves do not intersect  
-Pascal