# Rotating vectors

**URL:** <https://forum.kirupa.com/t/rotating-vectors/279197>\
**Category:** programming\
**Created:** [January 11, 2009, 12:11pm UTC](https://forum.kirupa.com/t/rotating-vectors/279197 "2009-01-11T12:11:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![superpeppe](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@superpeppe](https://forum.kirupa.com/u/superpeppe)\
**Post date:** [January 11, 2009, 12:11pm UTC](https://forum.kirupa.com/t/rotating-vectors/279197/1 "2009-01-11T12:11:22Z")

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Hi

I am currently developing a game. Where I have a vector3d let’s call it v:  
[INDENT]v = (vx,vy,vz)  
[/INDENT]let’s say I also have an angle w counterclockwise around the v vector.  
Now i need to describe a vector t:  
[INDENT]t = (tx,ty,tz)  
[/INDENT]where t is 90degrees on v and t has the rotation w around v.  
How do you find tx, ty, tz? (The length of t does not matter)

I have been trying to solve this and has come up with some strange results. If somebody can help me I would greatly appreciate it =)  
If you have a link, that would be fine to =)