[fluxus] arcball rotation

[dave]

On Fri, 2006-02-17 at 00:52 +0100, Artem Baguinski wrote:
> hi
> 
> attached is a patch against current cvs which
> 
> (a) adds quaternion class to dada.h
> (b) uses a couple of quaternions to implement arcball rotation with  
> the first mouse button
> 
> it's magick

ah that's much better, thanks! :)

quaternions certainly are a dark math-magick

I think we want that for 0.9 - do you want to commit it?

cheers,

dave