# Spiral type Clothoid with two non-zero radius

**URL:** <https://forum.dynamobim.com/t/spiral-type-clothoid-with-two-non-zero-radius/57333>\
**Category:** Revit\
**Tags:** revit, geometry, dynamo\
**Created:** [November 17, 2020, 12:08am UTC](https://forum.dynamobim.com/t/spiral-type-clothoid-with-two-non-zero-radius/57333 "2020-11-17T00:08:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Kirisaki](https://avatars.discourse-cdn.com/v4/letter/k/8e7dd6/32.png) [@Kirisaki](https://forum.dynamobim.com/u/Kirisaki)\
**Post date:** [November 17, 2020, 12:08am UTC](https://forum.dynamobim.com/t/spiral-type-clothoid-with-two-non-zero-radius/57333/1 "2020-11-17T00:08:52Z")

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Hello!

I successfully created a clothoid type Spiral line in Dynamo, python script using [this method](https://www.autodesk.com/autodesk-university/class/MEP-Modeling-Made-Easy-Dynamo-2017#handout), on page 10-13. But I got a problem if both radiusStart and radiusEnd has value (neither of them is “INF”). I guess this method does not apply to this case. I am asking for your help on this. I’ve been searching any related problems about it on the internet but I failed to find the exact solution. If ever you want to take a deeper visual for my problem, please view the files [here](https://drive.google.com/drive/folders/1Quv9T3bkjidAyZYKWRUhTcbcg_QIVV-G?usp=sharing). Thank you in advance!