# How to get vector perpendicular to curve?

**URL:** https://forum.dynamobim.com/t/how-to-get-vector-perpendicular-to-curve/31419
**Category:** Revit
**Created:** [January 30, 2019, 10:55am UTC](https://forum.dynamobim.com/t/how-to-get-vector-perpendicular-to-curve/31419 "2019-01-30T10:55:34Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![Mark.Ackerley](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/mark.ackerley/32/79310_2.png) [@Mark.Ackerley](https://forum.dynamobim.com/u/Mark.Ackerley)
#### Post date: [January 30, 2019, 12:02pm UTC](https://forum.dynamobim.com/t/how-to-get-vector-perpendicular-to-curve/31419/4 "2019-01-30T12:02:17Z")

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See if this helps, credit to @Marcello_Sgambelluri, visualising vector direction…

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/4/d4d8a8e7e5249690645d30b671be27fe5f890610.png)

Edit:

Maybe this works for you?

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/b/a/ba41fe655a545fc11f1310723ae5fa0a07be5845.png)

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