# Intersection result inccorect for trivial cases

**URL:** <https://forum.dynamobim.com/t/intersection-result-inccorect-for-trivial-cases/115206>\
**Category:** Geometry\
**Created:** [September 17, 2026, 12:03pm UTC](https://forum.dynamobim.com/t/intersection-result-inccorect-for-trivial-cases/115206 "2026-09-17T12:03:35Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![G-G](https://avatars.discourse-cdn.com/v4/letter/g/2acd7d/32.png) [@G-G](https://forum.dynamobim.com/u/G-G)\
**Post date:** [September 17, 2026, 12:03pm UTC](https://forum.dynamobim.com/t/intersection-result-inccorect-for-trivial-cases/115206/1 "2026-09-17T12:03:35Z")

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Hi all,

I already reported this years ago, when I was still with Autodesk, but it apparently never got fixed:

When intersecting a planar surface with a plane, the intersection result is incorrect when one of the axis of the planes lies in the surface. The intersection results in two points then, instead of a curve.

When rotating the plane a bit before the intersection, the result is correct (a curve), but I really don’t want to write code like this. ☹

 ![Intersection-Bug](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/1/6/166059ffcc05d78301a7f769ffd351545ff42177.png)

[Planar-Intersections-incorrect.dyn](https://forum.dynamobim.com/uploads/short-url/9Dy9yif9O9pBQFTeiEuQ4rlV4Wx.dyn) (22.7 KB)

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [September 17, 2026, 2:38pm UTC](https://forum.dynamobim.com/t/intersection-result-inccorect-for-trivial-cases/115206/2 "2026-09-17T14:38:23Z")

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Good to see you around @G-G! 😃

I’ll raise to the development team - thanks for the sample.

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**Author:** ![G-G](https://avatars.discourse-cdn.com/v4/letter/g/2acd7d/32.png) [@G-G](https://forum.dynamobim.com/u/G-G)\
**Post date:** [September 17, 2026, 5:41pm UTC](https://forum.dynamobim.com/t/intersection-result-inccorect-for-trivial-cases/115206/3 "2026-09-17T17:41:03Z")

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Thanks for taking care of this, Jacob! 🙂