# Adding or removing point when editing spline

**URL:** <https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217>\
**Category:** Modeling Questions\
**Created:** [March 3, 2019, 2:56am UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217 "2019-03-03T02:56:14Z")\
**Posts on this page:** 20\
**Page:** 1

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**Author:** ![Aldhis](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aldhis/32/3389_2.png) [@Aldhis](https://discourse.shapr3d.com/u/Aldhis)\
**Post date:** [March 3, 2019, 2:56am UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/1 "2019-03-03T02:56:14Z")

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Hi Team,

How to add or remove point when editing splines or any curve?

Regards,

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**Author:** ![Aldhis](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aldhis/32/3389_2.png) [@Aldhis](https://discourse.shapr3d.com/u/Aldhis)\
**Post date:** [March 3, 2019, 3:05am UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/2 "2019-03-03T03:05:22Z")

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Hi, I’m also trying to change spline point from bezier (smooth tip) to ‘point’ (pointy tip), the one similar in vector app. Is this possible with Shapr3D?

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**Author:** ![hamedtopic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/hamedtopic/32/3371_2.png) [@hamedtopic](https://discourse.shapr3d.com/u/hamedtopic)\
**Post date:** [March 3, 2019, 8:11pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/3 "2019-03-03T20:11:19Z")

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Hi Iman

I’m not a team member, I see nobody answered you after a day! so my apologies if not being that eligible to answer you but you could follow the vids below; those are very easy to do;

Removing a point from a spline:

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/0/0356f8f863527738c58ebfd1f9448460dc3042a9.MOV](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/0/0356f8f863527738c58ebfd1f9448460dc3042a9.MOV)

Addition of a point on a spline:

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/1/15269015dfcd80d6c50302e3d90d73f43ff47978.MOV](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/1/15269015dfcd80d6c50302e3d90d73f43ff47978.MOV)

Best

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**Author:** ![Aldhis](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aldhis/32/3389_2.png) [@Aldhis](https://discourse.shapr3d.com/u/Aldhis)\
**Post date:** [March 3, 2019, 10:56pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/4 "2019-03-03T22:56:23Z")

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Hi @hamedtopic,

Thank you, it help a lot. It’s very simple once we know it. So we simply choose the point and delete it on the left side button. While to add, just press firmly (just like when you create new splines) and new control point is added.  
But it seems that we can’t do this on circle, arc, rectangle, or other defined shapes? Only on the splines we created previously.

How about to move one of the arm of the control/bezier point to make it a pointing/sharp curve or to make it smooth (move both arms of control point)? Am I missing another clue here?

Regards,

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**Author:** ![tommyn](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tommyn/32/1714_2.png) [@tommyn](https://discourse.shapr3d.com/u/tommyn)\
**Post date:** [March 3, 2019, 11:31pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/5 "2019-03-03T23:31:46Z")

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Thanks to Joseph for helping us all out…

Best,

Tommy

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**Author:** ![hamedtopic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/hamedtopic/32/3371_2.png) [@hamedtopic](https://discourse.shapr3d.com/u/hamedtopic)\
**Post date:** [March 4, 2019, 5:15am UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/6 "2019-03-04T05:15:45Z")

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> [@Aldhis](#):
>
> But it seems that we can’t do this on circle, arc, rectangle, or other defined shapes? Only on the splines we created previously.

I don’t understand your ultimate intention on this, there is not any point on the perimeter of those shapes to be removed from and also you can add any point on the perimeter of a curve, circle or triangle by simply joining a guiding line to your desired point (location) or two lines to trim a part of perimeter as follows:

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/a/a901426e7b1c3802bb6bdd67b102fc0825d2d315.MOV](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/a/a901426e7b1c3802bb6bdd67b102fc0825d2d315.MOV)

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/7/7ee7b03d80b3ecb27b75119e2e8d25d28ee20215.MOV](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/7/7ee7b03d80b3ecb27b75119e2e8d25d28ee20215.MOV)

> [@Aldhis](#):
>
> How about to move one of the arm of the control/bezier point to make it a pointing/sharp curve or to make it smooth (move both arms of control point)?

Could you please show this by a vid or an image?! It’s not so clear what you mean.

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**Author:** ![hamedtopic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/hamedtopic/32/3371_2.png) [@hamedtopic](https://discourse.shapr3d.com/u/hamedtopic)\
**Post date:** [March 4, 2019, 5:16am UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/7 "2019-03-04T05:16:58Z")

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Thanks Tommy, you’re a great advisor

Bests

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**Author:** ![Aldhis](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aldhis/32/3389_2.png) [@Aldhis](https://discourse.shapr3d.com/u/Aldhis)\
**Post date:** [March 4, 2019, 12:38pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/8 "2019-03-04T12:38:52Z")

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Hi Joseph,

Thank you again for sharing the video. It is useful trick which I should be able to use. I’m actually just want to reconfirm that we can’t do this or if I missed another tutorial for this app.  
On the arms of points, I guess I’m just used to use vector app and hope to be able to do the same in Shapr3D. Below is screenshot of what I’m trying to do.

![image](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex002/uploads/shapr3d/original/2X/c/c2c18575149767ae73e876fd7f13f13f0878093a.jpeg) ![image](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex002/uploads/shapr3d/original/2X/5/52490afd4f7bb32c29a5276064926fac6e432133.jpeg)

Regards,

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**Author:** ![hamedtopic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/hamedtopic/32/3371_2.png) [@hamedtopic](https://discourse.shapr3d.com/u/hamedtopic)\
**Post date:** [March 4, 2019, 4:45pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/9 "2019-03-04T16:45:28Z")

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I think this is impossible with the current capabilities of the app, otherwise Shapr3D team could put us right on possible features.

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [March 4, 2019, 6:12pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/10 "2019-03-04T18:12:06Z")

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You can’t separately control the tangency in two directions. You can however create several connected spline segments (each with 2 control points) to achieve what you want.

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**Author:** ![Aldhis](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/aldhis/32/3389_2.png) [@Aldhis](https://discourse.shapr3d.com/u/Aldhis)\
**Post date:** [March 4, 2019, 10:34pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/11 "2019-03-04T22:34:37Z")

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Dear Joseph & Istvan,  
Thank you for your respond. I will just getting familiar with the app. Every shape that I need should already can be covered with current tool. 🙂  
Regards,

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**Author:** ![benzino](https://avatars.discourse-cdn.com/v4/letter/b/96bed5/32.png) [@benzino](https://discourse.shapr3d.com/u/benzino)\
**Post date:** [May 8, 2020, 3:01am UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/12 "2020-05-08T03:01:02Z")

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This really is a deal breaker for me (not being able to separate tangents) !  
Could you please carefully explain / visualize the alternative way you mention !  
(or point to some existing tutorials that explains it)  
Thanks

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [May 8, 2020, 1:27pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/13 "2020-05-08T13:27:06Z")

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I mean that you can simply create it with 2 splines.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/1/161494396eb713a4a80a3e649f63266aec3aa373.jpeg) ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/2/2bd1f56b35f7a31e923b0932f4f7899bac6470c1.jpeg)

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**Author:** ![pitosalas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/pitosalas/32/10471_2.png) [@pitosalas](https://discourse.shapr3d.com/u/pitosalas)\
**Post date:** [January 15, 2022, 9:31pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/14 "2022-01-15T21:31:18Z")

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For me, when I try to add a control point, it always goes to the selection mode pressing hard or soft or in between, it’s just kind of random… Help?

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**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [January 18, 2022, 4:22pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/15 "2022-01-18T16:22:46Z")

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Please make sure that the Spline tool is selected when you long tap to add control points.

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**Author:** ![pitosalas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/pitosalas/32/10471_2.png) [@pitosalas](https://discourse.shapr3d.com/u/pitosalas)\
**Post date:** [January 18, 2022, 10:06pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/16 "2022-01-18T22:06:58Z")

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That’s not what happens for me. For me even if I have the spline tool selected, the long tap results in the selection circle and never the sound effect and adding of a control point. Could it be related to the model iPad I have or some other factor? Can I make a screen recording somehow to show you?

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**Author:** ![DanielR](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/danielr/32/582_2.png) [@DanielR](https://discourse.shapr3d.com/u/DanielR)\
**Post date:** [January 18, 2022, 11:18pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/17 "2022-01-18T23:18:47Z")

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that would be helpful. Here is how you can record your screen on your iPad: [https://support.shapr3d.com/hc/en-us/articles/360000914654-How-do-I-record-my-iPad-screen-](https://support.shapr3d.com/hc/en-us/articles/360000914654-How-do-I-record-my-iPad-screen-)

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**Author:** ![pitosalas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/pitosalas/32/10471_2.png) [@pitosalas](https://discourse.shapr3d.com/u/pitosalas)\
**Post date:** [January 19, 2022, 12:36pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/18 "2022-01-19T12:36:52Z")

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Here is the screen recording. I tried holding, pressing, pressing harder. None of it had the desired effect.

[Video.mov](https://discourse.shapr3d.com/uploads/short-url/tua6DVkR7oTZuxsMOoSbBGjL711.mov) (3.38 MB)

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<div class="post-metadata">

**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [January 19, 2022, 1:08pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/19 "2022-01-19T13:08:41Z")

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I see, that is a different case. It is only possible to add control points to fit point splines, not control point splines 😕

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**Author:** ![pitosalas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/pitosalas/32/10471_2.png) [@pitosalas](https://discourse.shapr3d.com/u/pitosalas)\
**Post date:** [January 19, 2022, 1:23pm UTC](https://discourse.shapr3d.com/t/adding-or-removing-point-when-editing-spline/4217/20 "2022-01-19T13:23:58Z")

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Aha! Thanks

Pito Salas  
Computer Science  
Brandeis Univeristy

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