On Thu, Apr 1, 2010 at 2:59 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx
> At the moment, our Geometry module makes the assumption that direct
> isometries have positive determinant, and indirect isometries have
> negative determinant. In the southern hemisphere it's the opposite ---
> this is the mathematical phenomenon behind the famous Coriolis effect
> which makes cyclones spin counter clockwise in the northern
> hemisphere, and clockwise in the southern hemisphere.
> I'm working on a patch at the moment but I'm not sure how to best
> implement hemisphere detection. It could be selected at compile-time,
> but that means that binaries can only work in one hemisphere. Or we
> could implement runtime hemisphere detection on platforms that support
> it (more and more devices have accelerometers that detect very well
> the coriolis effect) or just use an internet-based service for
> geolocation, but i'm not sure if it's reasonable to let Eigen depend
> on a HTTP library? We could make that an optional dependency though.