[Marble-devel] Eigen

[Torsten Rahn]

Hi Benoit,

On Wednesday 14 January 2009 00:47:35 Benoit Jacob wrote:
> So my questions are:
> - do you have plans to use Eigen? 

Not at the moment. This could however very well change at some point after we 
introduce OpenGL. So I don't expect that it's very likely that we introduce 
Eigen as a dependency before KDE 4.3.  
Currently all we need is already in our Quaternion class.

> I ask because you have e.g. a
> Quaternion implementation... if our Quaternion is missing stuff you
> need we sure can get it in.

Well, I looked at the Eigen version of the Quaternion class recently (in the 
hope that I'd maybe be able to copy the class itself over). However it seems 
to be deeply interwoven already with the rest of Eigen, so I didn't look much 
further into it.

> - I don't know if Marble has more potential use cases for Eigen -- if
> this is all, then i could understand that you think it's not worth
> using eigen, although it's always good to have one class less to
> maintain.

Well, I feel reluctant to introduce a dependency on a new library just to 
transfer maintainance of a class that we have barely changed recently.

The only thing that I'm interested in is getting an SSE/Altivec acceleration 
of the method:

    void        Quaternion::rotateAroundAxis(const matrix &m);

However even for that one I'd rather like to copy over 2-5 classes than 
linking against a whole new library.

Best regards,

Torsten


> - if you have potential plans, any suggestions for the Eigen API?
>
> Cheers,
> Benoit
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