# How to resolve Flow Along Surface issue for shapes

**URL:** <https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461>\
**Category:** Rhino for Windows\
**Tags:** rhino8\
**Created:** [May 29, 2026, 6:28am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461 "2026-05-29T06:28:28Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [May 29, 2026, 6:28am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/1 "2026-05-29T06:28:28Z")

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![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/4/5/2/4524c108987f8bdcc1be43289f1841fc16143bb8.png)

while I am creating this design using flow along surface and the surface is slight round

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/a/2/0/a20d2a322093b2ded331f694fdc7f8fd9a09380a.png)

like as shown in front view so when I do this on surface the side objects are getting streched and not as per I have put on the base surface so how can I resolve that thing in rhino???

like in many of my design I am facing this issue also so I need to solve this thing in it.

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**Author:** ![davidcockey](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/davidcockey/32/732604_2.png) [@davidcockey](https://discourse.mcneel.com/u/davidcockey)\
**Post date:** [May 29, 2026, 7:48am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/2 "2026-05-29T07:48:54Z")

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Upload a .3dm file with an example. Include the shapes to be flowed, the base surface and the target surface.

My guess is there is a mis-match of the parameter distribution on the base surface and target surface.

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**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [May 29, 2026, 8:01am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/3 "2026-05-29T08:01:53Z")

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[Flow.3dm](https://discourse.mcneel.com/uploads/short-url/At2WNKiydYC8NxtNWnvHCUZToeF.3dm) (3.9 MB)

Here is the file for the issue which I have shared into the image

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**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [May 29, 2026, 11:34am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/4 "2026-05-29T11:34:07Z")

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Your base surface has a different proportion, and your target surface has curved sides, hence you get distortion. If you split it into a rectangular region and two curved “end caps”, you get what you want.

 ![Untitled-4](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/6/4/3/643466dae36f7244352feebb28604e84902d4aa9.png)

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**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [May 30, 2026, 4:28am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/5 "2026-05-30T04:28:21Z")

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@Lagom @davidcockey  
I traied your solution but still the object have to bend only on surface vertically but they are geting strcthed horizontally as well I am sharing my 3dm file here

Also please do not mark solution till the final answer which I meet from the community as I am aware about this and I will mark that solution when I will get proper answer.

Thanks and regards

[Flow.3dm](https://discourse.mcneel.com/uploads/short-url/5SsV6Kt9EqbSZAsogERmsmfXDWY.3dm) (9.3 MB)

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**Author:** ![jessesn](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jessesn/32/763881_2.png) [@jessesn](https://discourse.mcneel.com/u/jessesn)\
**Post date:** [May 30, 2026, 7:00am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/6 "2026-05-30T07:00:05Z")

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> [@dhruv1](#):
>
> I traied your solution but still the object have to bend only on surface vertically but they are geting strcthed horizontally as well I am sharing my 3dm file here
> 
> Also please do not mark solution till the final answer which I meet from the community as I am aware about this and I will mark that solution when I will get proper answer.

I’m not sure if this is what you want, but if it is, you can try using `FlowAlongSrf` + `Flow` to achieve it.

[FlowAlongSrf+Flow.3dm](https://discourse.mcneel.com/uploads/short-url/e6F63vhgDbjYmVSkwczd5QctAhN.3dm) (1.9 MB)

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<div class="post-metadata">

**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [May 30, 2026, 7:37am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/7 "2026-05-30T07:37:42Z")

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I have shared you the 3dm file in which while the objects are there reaching the edge they are getting stratched so main issue is that while the center objects remains proper so how can I resolve that.

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**Author:** ![jessesn](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jessesn/32/763881_2.png) [@jessesn](https://discourse.mcneel.com/u/jessesn)\
**Post date:** [May 30, 2026, 7:53am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/8 "2026-05-30T07:53:04Z")

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> [@dhruv1](#):
>
> I have shared you the 3dm file in which while the objects are there reaching the edge they are getting stratched so main issue is that while the center objects remains proper so how can I resolve that.

Sorry, I don’t quite understand where this issue you mentioned is occurring. Have you opened the model I provided to take a look? If so, could you please take a screenshot and let me know which area’s deformation in this model is unacceptable to you? Thank you.

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<div class="post-metadata">

**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [June 1, 2026, 4:47am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/9 "2026-06-01T04:47:20Z")

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@jessesn

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/9/f/4/9f47588a3fa1f50c6a55d455935970fafdd5ef78.png)  
in the perspective vieew this is showing the curve on which I am trying to bend the object but as you can see in the front view the objects are getting stratched so that is I am asking and in the 3dm file which was shared by you previously has mostly flat shape so that is the main issue that not meet my doubt clearance

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**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [June 1, 2026, 5:21am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/10 "2026-06-01T05:21:54Z")

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In the left image, you can see the objects bend only with the vertical curvature of the surface - because the surface has no curved shape sideways. So, if you do the above, you have no sideways distortion.

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<div class="post-metadata">

**Author:** ![jessesn](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jessesn/32/763881_2.png) [@jessesn](https://discourse.mcneel.com/u/jessesn)\
**Post date:** [June 1, 2026, 6:28am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/11 "2026-06-01T06:28:52Z")

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> [@dhruv1](#):
>
> in the perspective vieew this is showing the curve on which I am trying to bend the object but as you can see in the front view the objects are getting stratched so that is I am asking and in the 3dm file which was shared by you previously has mostly flat shape so that is the main issue that not meet my doubt clearance

You can fix this issue with the option `ConstrainNormal` of` FlowAlongSrf`, and FYI.

> **[ConstrainNormal - FlowAlongSrf | Rhino 3-D modeling](https://docs.mcneel.com/rhino/8/help/en-us/commands/flowalongsrf.htm#ConstrainNormal)**
>
> Specifies how the normal direction of the base surface is mapped onto the target surface. | The FlowAlongSrf command morphs objects from a source surface to a target surface.

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<div class="post-metadata">

**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [June 1, 2026, 6:46am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/12 "2026-06-01T06:46:56Z")

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This is for the one side surface but I am basically doing stone design so I have to put this all side as well if possible let me know if we can connect for a short meeting online so I can explain my doubt proper to you as I am close to my requirement as per your guideline but not exact that.

because when the shape is like the below image mostly ‘S’ curved so this is the main exect problem I am facing

still if possible let me know if we can connect online

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/c/2/c/c2c6ef263f6fb67034d6604917a09d3a5dda7dd1.png)

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<div class="post-metadata">

**Author:** ![jessesn](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jessesn/32/763881_2.png) [@jessesn](https://discourse.mcneel.com/u/jessesn)\
**Post date:** [June 1, 2026, 7:02am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/13 "2026-06-01T07:02:51Z")

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> [@dhruv1](#):
>
> This is for the one side surface but I am basically doing stone design so I have to put this all side as well if possible let me know if we can connect for a short meeting online so I can explain my doubt proper to you as I am close to my requirement as per your guideline but not exact that.
> 
> because when the shape is like the below image mostly ‘S’ curved so this is the main exect problem I am facing
> 
> still if possible let me know if we can connect online

If you need further technical support, pls email our technical support team ([tech@mcneel.com](mailto:tech@mcneel.com)). Thank you.

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<div class="post-metadata">

**Author:** ![dhruv1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dhruv1/32/723191_2.png) [@dhruv1](https://discourse.mcneel.com/u/dhruv1)\
**Post date:** [June 27, 2026, 5:24am UTC](https://discourse.mcneel.com/t/how-to-resolve-flow-along-surface-issue-for-shapes/219461/14 "2026-06-27T05:24:33Z")

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Greeting for the day @jessesn , @davidcockey , @Lagom I tried the solution you have given to me for the flow long surface and that is working fine for that but for another shape as target surface that solution not working for me.  
I am not sure that what is the mistake I am doing or I do not know exect step so the object is getting changed after the flow so please let me know exect step to do the same my requirement issue is below for better clearence.

1. I am creating this design for the stone CNC carving
2. The issue is I need the same shape without changing the structure and just set on the target surface and in proper shape so not looks abnormal so please help me related to this.
3. I am sharing the 3dm as well with this. also I have added just single object as the file is limited size so array the same in X direction for this for approx 4 to 5 (just reminder)

Thanks and regards  
[FlowAlongrf\_Isse.3dm](https://discourse.mcneel.com/uploads/short-url/tLtCMRUs8MARjD8pYLLGHMS4yUR.3dm) (5.9 MB)