# Flow along curve help on revolved surface

**URL:** <https://discourse.mcneel.com/t/flow-along-curve-help-on-revolved-surface/132223>\
**Category:** Rhino\
**Tags:** windows\
**Created:** [October 25, 2021, 7:54pm UTC](https://discourse.mcneel.com/t/flow-along-curve-help-on-revolved-surface/132223 "2021-10-25T19:54:20Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![pbeaty](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pbeaty/32/624314_2.png) [@pbeaty](https://discourse.mcneel.com/u/pbeaty)\
**Post date:** [October 25, 2021, 7:54pm UTC](https://discourse.mcneel.com/t/flow-along-curve-help-on-revolved-surface/132223/1 "2021-10-25T19:54:20Z")

</div>

Having issues getting my objects to flow along surface properly. Can anyone please let me know why I am getting squared off parts on ring surface and also why flow along surface sometimes puts objects on back of surface even though direction is correct. Thank you for the help.

 ![flow along surface issue](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/1/c/9/1c9f372641709601d4f71bbac0ef9396aab87def.jpeg)

[https://drive.google.com/file/d/1Xhhv3QhkqRYdm8aVGZC9VWtRM\_\_yfE5v/view?usp=sharing](https://drive.google.com/file/d/1Xhhv3QhkqRYdm8aVGZC9VWtRM__yfE5v/view?usp=sharing)

[https://drive.google.com/file/d/1J5K10kNkZkTIImHuV9fyVndQ5FFg2KiI/view?usp=sharing](https://drive.google.com/file/d/1J5K10kNkZkTIImHuV9fyVndQ5FFg2KiI/view?usp=sharing)

---

<div class="post-metadata">

**Author:** ![Tom\_P](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tom_p/32/766520_2.png) [@Tom\_P](https://discourse.mcneel.com/u/Tom_P)\
**Post date:** [October 25, 2021, 8:05pm UTC](https://discourse.mcneel.com/t/flow-along-curve-help-on-revolved-surface/132223/2 "2021-10-25T20:05:36Z")

</div>

![Screenshot 2021-10-25 at 22.01.34](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/5/e/8/5e88c0c00647ad56339a945d47dc16985e32d008.png)

rebuild the target surface with acceptable tolerances  
(for example 10x10 points Degree 5,5 )

the problem is the nurbs-structure of the target surface…

in general it s a good idea to bring the surfaces together after flow-along-srf.  
mean, you design the surface /objects to flow intersecting the reference, so it will intersect the target, then trim, fillet or whatever.

check this forum for other flowAlongSrf Problems - you ll find a lot of useful tips

---

<div class="post-metadata">

**Author:** ![pbeaty](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pbeaty/32/624314_2.png) [@pbeaty](https://discourse.mcneel.com/u/pbeaty)\
**Post date:** [October 25, 2021, 8:15pm UTC](https://discourse.mcneel.com/t/flow-along-curve-help-on-revolved-surface/132223/3 "2021-10-25T20:15:21Z")

</div>

> [@Tom\_P](#):
>
> flowAlongSrf Problems

Thank you I will check this out is there a link to the forum or is it just under this heading?

---

<div class="post-metadata">

**Author:** ![Tom\_P](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tom_p/32/766520_2.png) [@Tom\_P](https://discourse.mcneel.com/u/Tom_P)\
**Post date:** [October 25, 2021, 9:03pm UTC](https://discourse.mcneel.com/t/flow-along-curve-help-on-revolved-surface/132223/4 "2021-10-25T21:03:33Z")

</div>

just do a search flowAlongSrf in the upper right of this page…  
for example you find some background in this post

> [@Uneven distribution with FlowAlongSrf compared to Flow(along curve) question](https://discourse.mcneel.com/t/uneven-distribution-with-flowalongsrf-compared-to-flow-along-curve-question/129149/2):
>
> Hello - `FlowAlongSrf looks at the UV of the base and target surfaces - some surfaces, while they look simple enough, do not have evenly distributed UVs - Cylinders are among these. If you rebuild that to degree 5 in U with 24 control points in U and degree 1 in V and 2 control points, the result will be very very close to a true cylinder and have evenly distributed parameters.
> 
> Another approach in this caase is to `UnrollSrfUV` the target surface and use that unrolled surface as the base surface.
> 
> -Pascal