Re: [Algorithms] Rotation about arbitrary axis

[Pierre T. <p.t...@wa...>]

Thanks everyone, I followed Paul Bourke's steps there and now it works:
http://www.swin.edu.au/astronomy/pbourke/geometry/rotate/

I suppose the matrix in my former link was wrong.


> Absolutely.  You can do it entirely in terms of elementary vector
geometry,
> which I certainly regard as simpler, or at least more elemenary than
> quaternions.

Agreed !


>         A cross (B cross C) = (A dot C)B - (A dot B)C
> (correct up to a sign that I can never remember).

Yup, we call that one the "double produit vectoriel" :)

Thanks Ron, this is always a pleasure to read from someone who enjoys what
he writes about.

P.