Sort UV islands by location instead of size?

Support Materials and Textures
#1

Does anyone know if it’s possible to ‘sort UV islands by location instead of size’? Instead of having large chunks to the bottom-left and tiny crumbs to the top-right, it would be great (mainly for leaky lightmaps) to re-organise islands by their actual location on the mesh.

Is there a script or some hidden option somewhere, does anyone know?

I probably shouldn’t need to post screenshots or blend files to explain this.

Thanks!

#2

Actually I just realised that Lightmap unwrap doesn’t sort UV islands by location anyway, which I think is wrong.

I would gladly donate money (/pay) a capable someone to write an addon that can achieve this because I think it’s really important for people trying to export lightmappable interiors to a game engine.