Re: [boost.QVM] can you explain quaternions in the docs?

From: Bjørn Roald (bjorn.roald_at_[hidden])
Date: 2024-06-19 17:58:59

https://www.youtube.com/watch?v=d4EgbgTm0Bg%ef¿¼
Visualizing quaternions (4d numbers) with stereographic projection
youtube.com

> On 12 May 2024, at 17:58, Kostas Savvidis via Boost <boost_at_[hidden]> wrote:
> 
> 
> 
>> On May 11, 2024, at 22:55, Andrzej Krzemienski via Boost <boost_at_[hidden]> wrote:
>> 
>> Could I request an introduction section in the docs that would explain what
>> quaternions are and why one would want to use them?
> 
> A good reference is
> https://danceswithcode.net/engineeringnotes/quaternions/quaternions.html
> There is a compendium of formulae for converting to and from 
> 1) Euler angles
> 2) rotation matrices 
> 3) axis/angle representation
> 
> The major advantage of quaternions is
> 1) over Euler angles is avoiding "gymbal lock", 
> 2)  over matrices the advantage is less or no redundant data,
> 3) composing two rotations is difficult with axis/angle but easy with quaternions.
> 
> Hope that helps alittle
> 
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