# Spline between / across front and top planes

**URL:** <https://discourse.shapr3d.com/t/spline-between-across-front-and-top-planes/32290>\
**Category:** Modeling Questions\
**Created:** [June 3, 2024, 11:26am UTC](https://discourse.shapr3d.com/t/spline-between-across-front-and-top-planes/32290 "2024-06-03T11:26:52Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![PEC](https://avatars.discourse-cdn.com/v4/letter/p/67e7ee/32.png) [@PEC](https://discourse.shapr3d.com/u/PEC)\
**Post date:** [June 4, 2024, 9:54pm UTC](https://discourse.shapr3d.com/t/spline-between-across-front-and-top-planes/32290/7 "2024-06-04T21:54:41Z")

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Hi,

Here is a possible way, with splines on two orthogonal planes to define 3D edge to sweep.  
A few hints:

- you need to add the external fillets at the pipes junctions before the shell command, in order to get smooth edges inside the pipes
- the order of the fillets 01 and 02 is important, as well not including tangent edges for fillet 02. I started with a small radius for fillet 02 because otherwise it fails before disabling tangent edges
- I applied a 0.99 scaling factor to the center pipe to get a better looking result at the junction of the 4 pipes

Hope it helps.  
PEC

[Exhaust.shapr](https://discourse.shapr3d.com/uploads/short-url/5rKM2LN5rRQWgM3Sb8pcQfUoRBM.shapr) (2.1 MB)

 ![IMG_0461.PNG](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/8/b/8ba402a081114c51336ace843b34ef5ad1ef2889.jpeg)  
 ![IMG_0459.PNG](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/3/9/39a3867409a8d8c20bafe98b15039eddba040ed0.jpeg)

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