# Spline to smooth surface

**URL:** https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040
**Category:** Modeling Questions
**Created:** [March 31, 2020, 9:04pm UTC](https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040 "2020-03-31T21:04:16Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![RonJeffries](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/ronjeffries/32/5708_2.png) [@RonJeffries](https://discourse.shapr3d.com/u/RonJeffries)
#### Post date: [March 31, 2020, 9:04pm UTC](https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040/1 "2020-03-31T21:04:16Z")

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i want to make a smooth surface with the shape of a spline, as if extruded at right angles to the spline’s curvature. or like a loft between two copies of the spline. how might this be done?

objective is to slice the object below along that curve

 ![IMG_1097](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/f/f424f40de6b98c0504c719860879636ab9fe60ff.png)

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### Author: ![Gelphyn](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@Gelphyn](https://discourse.shapr3d.com/u/Gelphyn)
#### Post date: [March 31, 2020, 9:54pm UTC](https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040/2 "2020-03-31T21:54:20Z")

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@RonJeffries  
Is this the sort of result you want:

 ![IMG_1651](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/5/55d4e0a9a488e679b4036fe6a4a94e0667c58869.jpeg)

If not please explain further.

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### Author: ![RonJeffries](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/ronjeffries/32/5708_2.png) [@RonJeffries](https://discourse.shapr3d.com/u/RonJeffries)
#### Post date: [March 31, 2020, 10:05pm UTC](https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040/3 "2020-03-31T22:05:44Z")

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yes if the cut is a spline and not just a plane.

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### Author: ![Gelphyn](https://avatars.discourse-cdn.com/v4/letter/g/db5fbb/32.png) [@Gelphyn](https://discourse.shapr3d.com/u/Gelphyn)
#### Post date: [March 31, 2020, 10:15pm UTC](https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040/4 "2020-03-31T22:15:37Z")

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The Spline was Sketched on a Plane above the Body

Then three Lines were added to the Spline to form a **Closed Curve** :

 ![IMG_1657](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/f/f1577ae373ab9dc0c1bbb81a6c212a1c65c74c1f.jpeg)

Highlight the Closed Curve and drag it downward and through the Body in one movement:

 ![IMG_1653](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/5/5d81ee19d708f54f96b9a2fc575a278ac4f5a386.jpeg) ![IMG_1654](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/f/f081b458c3cedf7503f832ea3440de8dafef891c.jpeg)

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### Author: ![RonJeffries](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/ronjeffries/32/5708_2.png) [@RonJeffries](https://discourse.shapr3d.com/u/RonJeffries)
#### Post date: [March 31, 2020, 11:30pm UTC](https://discourse.shapr3d.com/t/spline-to-smooth-surface/7040/5 "2020-03-31T23:30:59Z")

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super. thanks. i feel i should have known that but these tools aren’t second nature yet.  
thanks!