# Dynamo surface vs. Revit Surface - node: RevitFaceReference.FromDynamoSurface

**URL:** <https://forum.dynamobim.com/t/dynamo-surface-vs-revit-surface-node-revitfacereference-fromdynamosurface/39346>\
**Category:** Developers\
**Created:** [August 10, 2019, 9:40am UTC](https://forum.dynamobim.com/t/dynamo-surface-vs-revit-surface-node-revitfacereference-fromdynamosurface/39346 "2019-08-10T09:40:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![merlijnvanleeuwen](https://avatars.discourse-cdn.com/v4/letter/m/77aa72/32.png) [@merlijnvanleeuwen](https://forum.dynamobim.com/u/merlijnvanleeuwen)\
**Post date:** [August 10, 2019, 9:40am UTC](https://forum.dynamobim.com/t/dynamo-surface-vs-revit-surface-node-revitfacereference-fromdynamosurface/39346/1 "2019-08-10T09:40:04Z")

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Hi all,

can somebody explain to me why there’s any difference between a surface created in dynamo and a surface selected from Revit. Its both a surface, right?

![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/f/df77eb139df0c95042fe626e599ceac91c41202c.png)

I’m using a node from clockwork ‘RevitFaceReference.FromDynamoSurface’. My surfaces created in dynamo gives me ‘null’ and faces selected from Revit a reference as expected.

Thanks in advance!!

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**Author:** ![Thomas\_Corrie](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/thomas_corrie/32/63060_2.png) [@Thomas\_Corrie](https://forum.dynamobim.com/u/Thomas_Corrie)\
**Post date:** [August 10, 2019, 12:17pm UTC](https://forum.dynamobim.com/t/dynamo-surface-vs-revit-surface-node-revitfacereference-fromdynamosurface/39346/2 "2019-08-10T12:17:16Z")

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RevitFaceReference.FromDynamoSurface will only return a RevitFaceReference if there is a Revit face underlying the Dynamo surface, not if the Dynamo surface has been created independently:

> [@Clockwork RevitFaceReference.FromDynamoSurface returns null](https://forum.dynamobim.com/t/clockwork-revitfacereference-fromdynamosurface-returns-null/4999/2):
>
> You just created that face from scratch. It does not have a Revit equivalent inside the model. That node works only for faces selected with the built-in “Select Face(s)” node.

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**Author:** ![merlijnvanleeuwen](https://avatars.discourse-cdn.com/v4/letter/m/77aa72/32.png) [@merlijnvanleeuwen](https://forum.dynamobim.com/u/merlijnvanleeuwen)\
**Post date:** [August 12, 2019, 5:43am UTC](https://forum.dynamobim.com/t/dynamo-surface-vs-revit-surface-node-revitfacereference-fromdynamosurface/39346/3 "2019-08-12T05:43:36Z")

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@Thomas_Corrie, clear, thanks