# Convert TIN surfaces to surfaces

**URL:** <https://forum.dynamobim.com/t/convert-tin-surfaces-to-surfaces/89371>\
**Category:** Civil 3D\
**Tags:** python, dynamo\
**Created:** [May 9, 2023, 1:48am UTC](https://forum.dynamobim.com/t/convert-tin-surfaces-to-surfaces/89371 "2023-05-09T01:48:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![k-horiYJ27A](https://avatars.discourse-cdn.com/v4/letter/k/7993a0/32.png) [@k-horiYJ27A](https://forum.dynamobim.com/u/k-horiYJ27A)\
**Post date:** [May 9, 2023, 1:48am UTC](https://forum.dynamobim.com/t/convert-tin-surfaces-to-surfaces/89371/1 "2023-05-09T01:48:10Z")

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Hello everyone, I am looking for a way to convert a corridor surface (TIN surface) to a surface!

I am currently looking for a way to convert a corridor surface (TIN surface) to a surface.  
I have tested several ways to do it but all of them failed.

1.TIN surface =\> mesh =\> convert to points =\> delete duplicate points (python) =\> create surface from a collection of points [failed].

1. TIN surface =\> convert to triangles =\> convert to surface in Patch =\> merge into one surface [Failure].

Is there any great solution? 💦

 ![python](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/8/4/84aa2b63cee2ac5e284c7c9f2c31756ed93ea729.png)  
 ![キャプチャ](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/a/5a93dac3939c4ea0a938a5595d0a7830b591e311.png)  
 ![上部工自動作成_2023-05-09_10-32-40](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/d/dddfc38b3b691d1f20280617cb3ccfb187fe8123.png)

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<div class="post-metadata">

**Author:** ![A.C3D](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/a.c3d/32/196902_2.png) [@A.C3D](https://forum.dynamobim.com/u/A.C3D)\
**Post date:** [April 9, 2024, 7:07am UTC](https://forum.dynamobim.com/t/convert-tin-surfaces-to-surfaces/89371/2 "2024-04-09T07:07:00Z")

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Hi, have you found a solution? Thanks.

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**Author:** ![f.furger](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/f.furger/32/180453_2.png) [@f.furger](https://forum.dynamobim.com/u/f.furger)\
**Post date:** [November 7, 2024, 7:29am UTC](https://forum.dynamobim.com/t/convert-tin-surfaces-to-surfaces/89371/3 "2024-11-07T07:29:40Z")

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I am currently facing the same problem.

My approach was as follows:

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/6/26f1d66927b7ca061b4b98c68f161f232d7b310b.png)

… but the Dynamo Surface does not match the TINSurface from Civil3D at all. The z coordiantes show differences (\> 1m)

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/2/62e698bd95e76c300408a2b9de7863b97f458fe1.png)

Does anyone know another workflow?