[Interest] Replacement for Qt4 QMatrix4x4?

[Jason H]

> On 22/02/2019 04.08, Paolo Angelelli wrote:
> > You aren't telling us much, except that you need to invert it and multiply points with it.
> > If QtPositioning-private is an acceptable dependency instead of pulling in eigen (or others),
> > you could probably get away with the private QDoubleMatrix4x4 that is in there, basically
> > a double QMatrix4x4.
> 
> No... I'm developing *with* Qt. I'm not developing Qt itself :-).
> 
> Mostly, I was surprised that QGenericMatrix has no method to invert the
> matrix. (Obviously such method would be conditional on square matrices,
> but...)

Well I think if you want such things eigen (http://eigen.tuxfamily.org/index.php?title=Main_Page) is what you need. However, I would love to see Qt incorporate some basic operations. BUt i'm unable to articulate what those are right now. I think it would get it's tendrils into QImage though, where I do quite a bit of work (image convolutions)