# How do I calculate dihedral angles using plug-ins-again

**URL:** https://discourse.slicer.org/t/how-do-i-calculate-dihedral-angles-using-plug-ins-again/36510
**Category:** Support
**Created:** [May 31, 2024, 3:06am UTC](https://discourse.slicer.org/t/how-do-i-calculate-dihedral-angles-using-plug-ins-again/36510 "2024-05-31T03:06:55Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![YLX](https://avatars.discourse-cdn.com/v4/letter/y/c57346/32.png) [@YLX](https://discourse.slicer.org/u/YLX)
#### Post date: [May 31, 2024, 3:06am UTC](https://discourse.slicer.org/t/how-do-i-calculate-dihedral-angles-using-plug-ins-again/36510/1 "2024-05-31T03:06:55Z")

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Hi, I was just wondering how do I figure out the dihedral Angle of two planes in 3D Slicer? My plane 1, the yellow plane, is made up of 3 coordinate points, and the purple plane is made up of 4 coordinate points. I have found the plug-in Angle Planes, but the usage instructions are not very clear, so I don’t know how to use this plug-in now. I have tried the code, but it doesn’t work, so I would like to ask teachers if there is any good solution for this plug-in, why P1 or P2 can’t be chosen to create a new project?

 ![Q9DKDW{7``2MT19_5EU{20](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/7/e798600115f46746832b3e27c3f6baac35c8fd78.jpeg)

 ![E0J0`37O9$(QW3(D3JY10](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/1/710501aa91f6941888bd1f0349e41e15e772f12f.jpeg)

 ![%}3~}3I_IUB9X8PW1~(`@HS](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/6/865e664fee538c10e3e178be708d095269f5d138.jpeg)

Operating system:  
Slicer version:5.7.0  
Expected behavior:  
Actual behavior: