# Spline Problem

**URL:** <https://discourse.shapr3d.com/t/spline-problem/7951>\
**Category:** Modeling Questions\
**Created:** [June 11, 2020, 2:45pm UTC](https://discourse.shapr3d.com/t/spline-problem/7951 "2020-06-11T14:45:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mhek](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@mhek](https://discourse.shapr3d.com/u/mhek)\
**Post date:** [June 11, 2020, 2:45pm UTC](https://discourse.shapr3d.com/t/spline-problem/7951/1 "2020-06-11T14:45:47Z")

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I have 4 cylinders created that I would like to extend the 4 bottom .5 diameter tubes to the four sketched circles below. It can’t be extended in a straight line but needs to have a gentle curve.  
What is the easiest way to go about this?

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**Author:** ![mhek](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@mhek](https://discourse.shapr3d.com/u/mhek)\
**Post date:** [June 11, 2020, 2:46pm UTC](https://discourse.shapr3d.com/t/spline-problem/7951/2 "2020-06-11T14:46:49Z")

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[Spline Problem.shapr](https://discourse.shapr3d.com/uploads/short-url/cpmFJ2dVUfqNLXkmIIvlk7ZBLTN.shapr) (268 KB)  
Here is the file for the issue.

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [June 11, 2020, 3:14pm UTC](https://discourse.shapr3d.com/t/spline-problem/7951/3 "2020-06-11T15:14:40Z")

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One way is to use Loft. I copied your circles and moved then up in 3D space and gently increasing the distance from each other. Then I used Loft to create the curved tube. Note: this is a Q&D (quick and dirty) example of how this can be done.  
-Mike  
[LoftTool.shapr](https://discourse.shapr3d.com/uploads/short-url/1ToKgduLQsXU290LWereCafP1Ow.shapr) (372 KB)

 ![bent tubes.PNG](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/a/a78d971037a444cb43cba9a761f63221b76b958d.jpeg)

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**Author:** ![mhek](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@mhek](https://discourse.shapr3d.com/u/mhek)\
**Post date:** [June 11, 2020, 4:03pm UTC](https://discourse.shapr3d.com/t/spline-problem/7951/4 "2020-06-11T16:03:24Z")

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Thanks for the quick response. Exactly what I needed.