# Curve.NormalAtParameter changes results at an angle

**URL:** <https://forum.dynamobim.com/t/curve-normalatparameter-changes-results-at-an-angle/19582>\
**Category:** Geometry\
**Created:** [March 1, 2018, 11:04pm UTC](https://forum.dynamobim.com/t/curve-normalatparameter-changes-results-at-an-angle/19582 "2018-03-01T23:04:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Joseph\_Gemperline](https://avatars.discourse-cdn.com/v4/letter/j/87869e/32.png) [@Joseph\_Gemperline](https://forum.dynamobim.com/u/Joseph_Gemperline)\
**Post date:** [March 1, 2018, 11:04pm UTC](https://forum.dynamobim.com/t/curve-normalatparameter-changes-results-at-an-angle/19582/1 "2018-03-01T23:04:24Z")

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Im having trouble understanding why I get a vector pointing in the y direction when its a vertical line and in the x direction when its slightly at an angle. Im working with detail lines in a section view. I would like it to point perpendicular in the y,z direction. Thanks for the help.

 ![NormalAt%20Parameter](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/3/5/356c0db8c4d5edd28f519af05110b512cb8caaf6.JPG) ![NormalAt%20Parameter%20Angular](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/9/6/968ca7a7f609fab552e42c152f24ce710ea8e666.JPG)

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**Author:** ![salvatoredragotta](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/salvatoredragotta/32/10078_2.png) [@salvatoredragotta](https://forum.dynamobim.com/u/salvatoredragotta)\
**Post date:** [March 2, 2018, 1:22am UTC](https://forum.dynamobim.com/t/curve-normalatparameter-changes-results-at-an-angle/19582/2 "2018-03-02T01:22:38Z")

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You need to create a vector in the direction you want:

Try this:

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/a/0/a0cac6cf7dcea4add1a930987d11e46cf26af506.png)

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<div class="post-metadata">

**Author:** ![Joseph\_Gemperline](https://avatars.discourse-cdn.com/v4/letter/j/87869e/32.png) [@Joseph\_Gemperline](https://forum.dynamobim.com/u/Joseph_Gemperline)\
**Post date:** [March 2, 2018, 3:28am UTC](https://forum.dynamobim.com/t/curve-normalatparameter-changes-results-at-an-angle/19582/3 "2018-03-02T03:28:44Z")

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Thanks so much. That’s what I needed.